diff --git a/README.ja.md b/README.ja.md
index fdae0cf4..a2d13f1a 100644
--- a/README.ja.md
+++ b/README.ja.md
@@ -290,20 +290,23 @@ $ vuls tui
 ----
 # Performance Considerations
 
-- Ubuntu, Debian and CentOS  
-アップデート対象のパッケージが沢山ある場合は、Changelogをパースするので遅いし、スキャン対象サーバのリソースを消費する。
+- Ubuntu, Debian  
+アップデート対象のパッケージが沢山ある場合は、毎回apt-get changelogするので遅いし、スキャン対象サーバのリソースを消費する。
+
+- CentOS  
+アップデート対象すべてのchangelogを一度で取得しパースする。スキャンスピードは高速、サーバリソース消費量は小さい。
 
 - Amazon, RHEL and FreeBSD  
 高速にスキャンし、スキャン対象サーバのリソース消費量は小さい。
 
 | Distribution|         Scan Speed | Resource Usage On Target Server |
 |:------------|:-------------------|:-------------|
+| Ubuntu      |               Slow | Heavy            |
+| Debian      |               Slow | Heavy            |
+| CentOS      |               Fast | Light            |
 | Amazon      |               Fast | Light            |
 | RHEL        |               Fast | Light            |
 | FreeBSD     |               Fast | Light            |
-| Ubuntu      |               Slow | Heavy            |
-| Debian      |               Slow | Heavy            |
-| CentOS      |               Slow | Heavy            |
 
 ----
 
diff --git a/README.md b/README.md
index 0eda8641..b3d43233 100644
--- a/README.md
+++ b/README.md
@@ -289,20 +289,25 @@ see https://github.com/future-architect/vuls/tree/master/setup/docker
 ----
 # Performance Considerations
 
-- on Ubuntu, Debian and CentOS  
-Vuls parses a changelog of upgradable packages. The scan speed is slow and resource usage is heavy when there are many updatable packages on target server.  
+- on Ubuntu and Debian  
+Vuls issues `apt-get changelog` for each upgradable packages and parse the changelog.  
+`apt-get changelog` is slow and resource usage is heavy when there are many updatable packages on target server.  
+
+- on CentOS  
+Vuls issues `yum update --changelog` to get changelogs of upgradable packages at once and parse the changelog.  
+Scan speed is fast and resource usage is light.  
 
 - On Amazon, RHEL and FreeBSD  
 High speed scan and resource usage is light because Vuls can get CVE IDs by using package manager(no need to parse a changelog).
 
 | Distribution|         Scan Speed | Resource Usage On Target Server |
 |:------------|:-------------------|:-------------|
+| Ubuntu      |               Slow | Heavy            |
+| Debian      |               Slow | Heavy            |
+| CentOS      |               Fast | Light            |
 | Amazon      |               Fast | Light            |
 | RHEL        |               Fast | Light            |
 | FreeBSD     |               Fast | Light            |
-| Ubuntu      |               Slow | Heavy            |
-| Debian      |               Slow | Heavy            |
-| CentOS      |               Slow | Heavy            |
 
 ----
 
diff --git a/img/vuls-architecture.graphml b/img/vuls-architecture.graphml
index 84ba3f90..c85fe548 100644
--- a/img/vuls-architecture.graphml
+++ b/img/vuls-architecture.graphml
@@ -392,7 +392,7 @@ ALAS (Amazon)<y:LabelModel>
               <y:Shape type="roundrectangle"/>
               <y:State closed="false" closedHeight="50.0" closedWidth="50.0" innerGraphDisplayEnabled="false"/>
               <y:Insets bottom="15" bottomF="15.0" left="15" leftF="15.0" right="15" rightF="15.0" top="15" topF="15.0"/>
-              <y:BorderInsets bottom="29" bottomF="28.96858723958337" left="12" leftF="12.249999999999773" right="0" rightF="0.0" top="49" topF="49.0"/>
+              <y:BorderInsets bottom="25" bottomF="24.639889388761645" left="12" leftF="12.249999999999773" right="2" rightF="2.4999999999995453" top="50" topF="49.515869140625114"/>
             </y:GroupNode>
             <y:GroupNode>
               <y:Geometry height="50.0" width="50.0" x="0.0" y="60.0"/>
@@ -411,7 +411,7 @@ ALAS (Amazon)<y:LabelModel>
         <node id="n9::n0">
           <data key="d6">
             <y:GenericNode configuration="com.yworks.flowchart.dataBase">
-              <y:Geometry height="70.0" width="60.5" x="747.1249999999995" y="34.484130859374886"/>
+              <y:Geometry height="70.0" width="60.5" x="809.75" y="132.8128287101966"/>
               <y:Fill color="#E8EEF7" color2="#B7C9E3" transparent="false"/>
               <y:BorderStyle color="#000000" type="line" width="1.0"/>
               <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" hasText="false" height="4.0" modelName="custom" textColor="#000000" visible="true" width="4.0" x="28.25" y="33.0">
@@ -452,7 +452,7 @@ ALAS (Amazon)<y:LabelModel>
         <node id="n9::n2">
           <data key="d6">
             <y:ShapeNode>
-              <y:Geometry height="50.0" width="80.0" x="802.4999999999995" y="148.4841308593749"/>
+              <y:Geometry height="50.0" width="80.0" x="800.0" y="35.0"/>
               <y:Fill color="#C0C0C0" transparent="false"/>
               <y:BorderStyle color="#000000" type="line" width="1.0"/>
               <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="18.1328125" modelName="custom" textColor="#000000" visible="true" width="46.796875" x="16.6015625" y="15.93359375">Fetcher<y:LabelModel>
@@ -605,7 +605,7 @@ Container<y:LabelModel>
           <y:Path sx="0.0" sy="0.0" tx="0.0" ty="0.0"/>
           <y:LineStyle color="#000000" type="line" width="1.0"/>
           <y:Arrows source="none" target="none"/>
-          <y:EdgeLabel alignment="center" configuration="AutoFlippingLabel" distance="2.0" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="32.265625" modelName="custom" preferredPlacement="anywhere" ratio="0.5" textColor="#000000" visible="true" width="106.240234375" x="98.64874426818972" y="-10.207796256635163">Fetch 
+          <y:EdgeLabel alignment="center" configuration="AutoFlippingLabel" distance="2.0" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="32.265625" modelName="custom" preferredPlacement="anywhere" ratio="0.5" textColor="#000000" visible="true" width="106.240234375" x="28.568307252002455" y="48.099340559462576">Fetch 
 Vulnerability data<y:LabelModel>
               <y:SmartEdgeLabelModel autoRotationEnabled="false" defaultAngle="0.0" defaultDistance="10.0"/>
             </y:LabelModel>
@@ -806,25 +806,7 @@ Vulnerability data<y:LabelModel>
           <y:Path sx="0.0" sy="0.0" tx="0.0" ty="0.0"/>
           <y:LineStyle color="#000000" type="line" width="1.0"/>
           <y:Arrows source="none" target="standard"/>
-          <y:EdgeLabel alignment="center" configuration="AutoFlippingLabel" distance="2.0" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="18.1328125" modelName="custom" preferredPlacement="anywhere" ratio="0.5" textColor="#000000" visible="true" width="37.10546875" x="-0.014769665799690301" y="-35.98834449405365">Insert<y:LabelModel>
-              <y:SmartEdgeLabelModel autoRotationEnabled="false" defaultAngle="0.0" defaultDistance="10.0"/>
-            </y:LabelModel>
-            <y:ModelParameter>
-              <y:SmartEdgeLabelModelParameter angle="0.0" distance="30.0" distanceToCenter="true" position="right" ratio="0.5" segment="0"/>
-            </y:ModelParameter>
-            <y:PreferredPlacementDescriptor angle="0.0" angleOffsetOnRightSide="0" angleReference="absolute" angleRotationOnRightSide="co" distance="-1.0" frozen="true" placement="anywhere" side="anywhere" sideReference="relative_to_edge_flow"/>
-          </y:EdgeLabel>
-          <y:BendStyle smoothed="false"/>
-        </y:PolyLineEdge>
-      </data>
-    </edge>
-    <edge id="n9::e1" source="n9::n0" target="n9::n1">
-      <data key="d10">
-        <y:PolyLineEdge>
-          <y:Path sx="0.0" sy="0.0" tx="0.0" ty="0.0"/>
-          <y:LineStyle color="#000000" type="line" width="1.0"/>
-          <y:Arrows source="none" target="standard"/>
-          <y:EdgeLabel alignment="center" configuration="AutoFlippingLabel" distance="2.0" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="18.1328125" modelName="custom" preferredPlacement="anywhere" ratio="0.5" textColor="#000000" visible="true" width="37.9375" x="-65.17704859198193" y="14.912883039360338">Select<y:LabelModel>
+          <y:EdgeLabel alignment="center" configuration="AutoFlippingLabel" distance="2.0" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="18.1328125" modelName="custom" preferredPlacement="anywhere" ratio="0.5" textColor="#000000" visible="true" width="37.10546875" x="-48.552734375" y="14.840008105098306">Insert<y:LabelModel>
               <y:SmartEdgeLabelModel autoRotationEnabled="false" defaultAngle="0.0" defaultDistance="10.0"/>
             </y:LabelModel>
             <y:ModelParameter>
@@ -901,6 +883,44 @@ Scan Result<y:LabelModel>
         </y:PolyLineEdge>
       </data>
     </edge>
+    <edge id="e14" source="n4::n2" target="n9::n0">
+      <data key="d9"/>
+      <data key="d10">
+        <y:PolyLineEdge>
+          <y:Path sx="0.0" sy="0.0" tx="0.0" ty="0.0"/>
+          <y:LineStyle color="#000000" type="line" width="1.0"/>
+          <y:Arrows source="none" target="standard"/>
+          <y:EdgeLabel alignment="center" configuration="AutoFlippingLabel" distance="2.0" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="18.1328125" modelName="custom" preferredPlacement="anywhere" ratio="0.5" textColor="#000000" visible="true" width="191.283203125" x="39.258457373248575" y="-102.36487019599565">--cve-dictoianry-dbpath option<y:LabelModel>
+              <y:SmartEdgeLabelModel autoRotationEnabled="false" defaultAngle="0.0" defaultDistance="10.0"/>
+            </y:LabelModel>
+            <y:ModelParameter>
+              <y:SmartEdgeLabelModelParameter angle="6.283185307179586" distance="99.7428628309468" distanceToCenter="true" position="right" ratio="0.749331808189429" segment="-1"/>
+            </y:ModelParameter>
+            <y:PreferredPlacementDescriptor angle="0.0" angleOffsetOnRightSide="0" angleReference="absolute" angleRotationOnRightSide="co" distance="-1.0" frozen="true" placement="anywhere" side="anywhere" sideReference="relative_to_edge_flow"/>
+          </y:EdgeLabel>
+          <y:BendStyle smoothed="false"/>
+        </y:PolyLineEdge>
+      </data>
+    </edge>
+    <edge id="n9::e1" source="n9::n1" target="n9::n0">
+      <data key="d9"/>
+      <data key="d10">
+        <y:PolyLineEdge>
+          <y:Path sx="0.0" sy="0.0" tx="0.0" ty="0.0"/>
+          <y:LineStyle color="#000000" type="line" width="1.0"/>
+          <y:Arrows source="none" target="standard"/>
+          <y:EdgeLabel alignment="center" configuration="AutoFlippingLabel" distance="2.0" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="18.1328125" modelName="custom" preferredPlacement="anywhere" ratio="0.5" textColor="#000000" visible="true" width="37.9375" x="0.8643523609480326" y="20.003628886299452">Select<y:LabelModel>
+              <y:SmartEdgeLabelModel autoRotationEnabled="false" defaultAngle="0.0" defaultDistance="10.0"/>
+            </y:LabelModel>
+            <y:ModelParameter>
+              <y:SmartEdgeLabelModelParameter angle="0.0" distance="30.0" distanceToCenter="true" position="right" ratio="0.5" segment="0"/>
+            </y:ModelParameter>
+            <y:PreferredPlacementDescriptor angle="0.0" angleOffsetOnRightSide="0" angleReference="absolute" angleRotationOnRightSide="co" distance="-1.0" frozen="true" placement="anywhere" side="anywhere" sideReference="relative_to_edge_flow"/>
+          </y:EdgeLabel>
+          <y:BendStyle smoothed="false"/>
+        </y:PolyLineEdge>
+      </data>
+    </edge>
   </graph>
   <data key="d7">
     <y:Resources>
diff --git a/img/vuls-architecture.png b/img/vuls-architecture.png
index a83dc634..ae5afebf 100644
Binary files a/img/vuls-architecture.png and b/img/vuls-architecture.png differ
diff --git a/img/vuls-scan-flow.graphml b/img/vuls-scan-flow.graphml
index d9e7f7a2..8fd15da2 100644
--- a/img/vuls-scan-flow.graphml
+++ b/img/vuls-scan-flow.graphml
@@ -17,7 +17,7 @@
     <node id="n0">
       <data key="d6">
         <y:GenericNode configuration="com.yworks.flowchart.process">
-          <y:Geometry height="56.0" width="268.0" x="176.83968253968254" y="0.0"/>
+          <y:Geometry height="56.0" width="268.0" x="309.6849206349206" y="0.0"/>
           <y:Fill color="#E8EEF7" color2="#B7C9E3" transparent="false"/>
           <y:BorderStyle color="#000000" type="line" width="1.0"/>
           <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="18.1328125" modelName="custom" textColor="#000000" visible="true" width="83.482421875" x="92.2587890625" y="18.93359375">Detect the OS<y:LabelModel>
@@ -33,7 +33,7 @@
     <node id="n1">
       <data key="d6">
         <y:GenericNode configuration="com.yworks.flowchart.decision">
-          <y:Geometry height="40.0" width="80.0" x="270.83968253968254" y="206.44247787610618"/>
+          <y:Geometry height="40.0" width="80.0" x="403.6849206349206" y="206.44247787610618"/>
           <y:Fill color="#E8EEF7" color2="#B7C9E3" transparent="false"/>
           <y:BorderStyle color="#000000" type="line" width="1.0"/>
           <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" hasText="false" height="4.0" modelName="custom" textColor="#000000" visible="true" width="4.0" x="38.0" y="18.0">
@@ -50,17 +50,17 @@
     <node id="n2">
       <data key="d6">
         <y:GenericNode configuration="com.yworks.flowchart.process">
-          <y:Geometry height="90.44247787610618" width="268.0" x="176.83968253968254" y="86.0"/>
+          <y:Geometry height="90.44247787610618" width="268.0" x="309.6849206349206" y="86.0"/>
           <y:Fill color="#E8EEF7" color2="#B7C9E3" transparent="false"/>
           <y:BorderStyle color="#000000" type="line" width="1.0"/>
-          <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="60.53125" modelName="custom" textColor="#000000" visible="true" width="170.763671875" x="48.6181640625" y="14.95561393805309">Get installed packages
+          <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="60.53125" modelName="custom" textColor="#000000" visible="true" width="170.763671875" x="48.61816406250006" y="14.95561393805309">Get installed packages
 Debian/Ubuntu: dpkg-query
 Amazon/RHEL/CentOS: rpm
 FreeBSD: pkg<y:LabelModel>
               <y:SmartNodeLabelModel distance="4.0"/>
             </y:LabelModel>
             <y:ModelParameter>
-              <y:SmartNodeLabelModelParameter labelRatioX="0.0" labelRatioY="0.0" nodeRatioX="0.0" nodeRatioY="0.0" offsetX="0.0" offsetY="0.0" upX="0.0" upY="-1.0"/>
+              <y:SmartNodeLabelModelParameter labelRatioX="0.0" labelRatioY="0.0" nodeRatioX="2.220446049250313E-16" nodeRatioY="0.0" offsetX="0.0" offsetY="0.0" upX="0.0" upY="-1.0"/>
             </y:ModelParameter>
           </y:NodeLabel>
         </y:GenericNode>
@@ -69,12 +69,11 @@ FreeBSD: pkg<y:LabelModel>
     <node id="n3">
       <data key="d6">
         <y:GenericNode configuration="com.yworks.flowchart.process">
-          <y:Geometry height="56.0" width="268.0" x="176.83968253968254" y="322.8409153761062"/>
+          <y:Geometry height="56.0" width="268.0" x="10.0" y="287.8409153761062"/>
           <y:Fill color="#E8EEF7" color2="#B7C9E3" transparent="false"/>
           <y:BorderStyle color="#000000" type="line" width="1.0"/>
-          <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="46.3984375" modelName="custom" textColor="#000000" visible="true" width="260.83984375" x="3.580078125" y="4.80078125">Get upgradable packages
-Debian/Ubuntu: apt-get upgrade --dry-run
-CentOS: yum check-upduate<y:LabelModel>
+          <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="32.265625" modelName="custom" textColor="#000000" visible="true" width="260.83984375" x="3.580078125" y="11.8671875">Get upgradable packages
+Debian/Ubuntu: apt-get upgrade --dry-run<y:LabelModel>
               <y:SmartNodeLabelModel distance="4.0"/>
             </y:LabelModel>
             <y:ModelParameter>
@@ -87,7 +86,7 @@ CentOS: yum check-upduate<y:LabelModel>
     <node id="n4">
       <data key="d6">
         <y:GenericNode configuration="com.yworks.flowchart.loopLimit">
-          <y:Geometry height="51.10998735777497" width="137.19216182048035" x="242.24360162944237" y="408.8409153761062"/>
+          <y:Geometry height="51.10998735777497" width="137.19216182048035" x="75.40391908975982" y="376.28592169721867"/>
           <y:Fill color="#E8EEF7" color2="#B7C9E3" transparent="false"/>
           <y:BorderStyle color="#000000" type="line" width="1.0"/>
           <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="32.265625" modelName="custom" textColor="#000000" visible="true" width="131.751953125" x="2.7201043477401754" y="9.422181178887513">foreach 
@@ -104,12 +103,11 @@ upgradable  packages<y:LabelModel>
     <node id="n5">
       <data key="d6">
         <y:GenericNode configuration="com.yworks.flowchart.process">
-          <y:Geometry height="56.0" width="268.0" x="176.83968253968254" y="489.9509027338811"/>
+          <y:Geometry height="56.0" width="268.0" x="10.0" y="459.8409153761062"/>
           <y:Fill color="#E8EEF7" color2="#B7C9E3" transparent="false"/>
           <y:BorderStyle color="#000000" type="line" width="1.0"/>
-          <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="46.3984375" modelName="custom" textColor="#000000" visible="true" width="213.619140625" x="27.1904296875" y="4.80078125">Get CVE IDs in the changelog
-Debian/Ubuntu: aptitude changelog
-CentOS: yum changelog<y:LabelModel>
+          <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="32.265625" modelName="custom" textColor="#000000" visible="true" width="213.619140625" x="27.1904296875" y="11.8671875">Parse changelog and get  CVE IDs
+Debian/Ubuntu: aptitude changelog<y:LabelModel>
               <y:SmartNodeLabelModel distance="4.0"/>
             </y:LabelModel>
             <y:ModelParameter>
@@ -122,7 +120,7 @@ CentOS: yum changelog<y:LabelModel>
     <node id="n6">
       <data key="d6">
         <y:GenericNode configuration="com.yworks.flowchart.loopLimitEnd">
-          <y:Geometry height="50.0" width="137.0" x="242.33968253968254" y="575.9509027338811"/>
+          <y:Geometry height="50.0" width="137.0" x="75.5" y="545.8409153761062"/>
           <y:Fill color="#E8EEF7" color2="#B7C9E3" transparent="false"/>
           <y:BorderStyle color="#000000" type="line" width="1.0"/>
           <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="18.1328125" modelName="custom" textColor="#000000" visible="true" width="55.24609375" x="40.876953125" y="15.93359375">end loop<y:LabelModel>
@@ -138,7 +136,7 @@ CentOS: yum changelog<y:LabelModel>
     <node id="n7">
       <data key="d6">
         <y:GenericNode configuration="com.yworks.flowchart.process">
-          <y:Geometry height="56.0" width="268.0" x="176.83968253968254" y="655.9509027338811"/>
+          <y:Geometry height="56.0" width="268.0" x="609.3698412698412" y="625.8409153761062"/>
           <y:Fill color="#E8EEF7" color2="#B7C9E3" transparent="false"/>
           <y:BorderStyle color="#000000" type="line" width="1.0"/>
           <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="18.1328125" modelName="custom" textColor="#000000" visible="true" width="194.904296875" x="36.5478515625" y="18.93359375">Select the CVE detail information<y:LabelModel>
@@ -154,7 +152,7 @@ CentOS: yum changelog<y:LabelModel>
     <node id="n8">
       <data key="d6">
         <y:GenericNode configuration="com.yworks.flowchart.process">
-          <y:Geometry height="56.0" width="268.0" x="474.8396825396825" y="322.8409153761062"/>
+          <y:Geometry height="56.0" width="268.0" x="609.3698412698412" y="287.8409153761062"/>
           <y:Fill color="#E8EEF7" color2="#B7C9E3" transparent="false"/>
           <y:BorderStyle color="#000000" type="line" width="1.0"/>
           <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="46.3984375" modelName="custom" textColor="#000000" visible="true" width="232.744140625" x="17.6279296875" y="4.80078125">Get CVE IDs by using package manager
@@ -172,7 +170,7 @@ FreeBSD: pkg audit<y:LabelModel>
     <node id="n9">
       <data key="d6">
         <y:GenericNode configuration="com.yworks.flowchart.dataBase">
-          <y:Geometry height="64.1719342604298" width="111.96965865992411" x="529.9395561174322" y="747.9140328697852"/>
+          <y:Geometry height="64.1719342604298" width="111.96965865992411" x="687.3850119398792" y="807.0697396491782"/>
           <y:Fill color="#E8EEF7" color2="#B7C9E3" transparent="false"/>
           <y:BorderStyle color="#000000" type="line" width="1.0"/>
           <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="18.1328125" modelName="custom" textColor="#000000" visible="true" width="48.56640625" x="31.701626204962054" y="23.019560880214726">Vuls DB<y:LabelModel>
@@ -188,10 +186,27 @@ FreeBSD: pkg audit<y:LabelModel>
     <node id="n10">
       <data key="d6">
         <y:GenericNode configuration="com.yworks.flowchart.dataBase">
-          <y:Geometry height="65.22882427307195" width="136.83944374209864" x="-8.419721871049319" y="657.385587863464"/>
+          <y:Geometry height="65.22882427307195" width="136.83944374209864" x="411.5802781289507" y="687.385587863464"/>
           <y:Fill color="#E8EEF7" color2="#B7C9E3" transparent="false"/>
           <y:BorderStyle color="#000000" type="line" width="1.0"/>
-          <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="18.1328125" modelName="custom" textColor="#000000" visible="true" width="117.970703125" x="9.434370308549319" y="23.548005886535975">CVE DB (NVD / JVN)<y:LabelModel>
+          <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="18.1328125" modelName="custom" textColor="#000000" visible="true" width="117.970703125" x="9.434370308549205" y="23.548005886535975">CVE DB (NVD / JVN)<y:LabelModel>
+              <y:SmartNodeLabelModel distance="4.0"/>
+            </y:LabelModel>
+            <y:ModelParameter>
+              <y:SmartNodeLabelModelParameter labelRatioX="0.0" labelRatioY="0.0" nodeRatioX="-8.326672684688674E-16" nodeRatioY="0.0" offsetX="0.0" offsetY="0.0" upX="0.0" upY="-1.0"/>
+            </y:ModelParameter>
+          </y:NodeLabel>
+        </y:GenericNode>
+      </data>
+    </node>
+    <node id="n11">
+      <data key="d6">
+        <y:GenericNode configuration="com.yworks.flowchart.process">
+          <y:Geometry height="56.0" width="268.0" x="609.3698412698412" y="716.4553275126422"/>
+          <y:Fill color="#E8EEF7" color2="#B7C9E3" transparent="false"/>
+          <y:BorderStyle color="#000000" type="line" width="1.0"/>
+          <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="32.265625" modelName="custom" textColor="#000000" visible="true" width="126.396484375" x="70.8017578125" y="11.8671875">Insert results into DB
+Reporting<y:LabelModel>
               <y:SmartNodeLabelModel distance="4.0"/>
             </y:LabelModel>
             <y:ModelParameter>
@@ -201,18 +216,34 @@ FreeBSD: pkg audit<y:LabelModel>
         </y:GenericNode>
       </data>
     </node>
-    <node id="n11">
+    <node id="n12">
       <data key="d6">
         <y:GenericNode configuration="com.yworks.flowchart.process">
-          <y:Geometry height="56.0" width="268.0" x="176.83968253968254" y="746.5653148704171"/>
+          <y:Geometry height="56.0" width="268.0" x="309.6849206349206" y="287.8409153761062"/>
           <y:Fill color="#E8EEF7" color2="#B7C9E3" transparent="false"/>
           <y:BorderStyle color="#000000" type="line" width="1.0"/>
-          <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="32.265625" modelName="custom" textColor="#000000" visible="true" width="126.396484375" x="70.8017578125" y="11.8671875">Insert results into DB
-Reporting<y:LabelModel>
+          <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="32.265625" modelName="custom" textColor="#000000" visible="true" width="271.369140625" x="-1.6845703124999432" y="11.8671875">Get all changelogs by using package manager
+CentOS: yum update --changelog<y:LabelModel>
               <y:SmartNodeLabelModel distance="4.0"/>
             </y:LabelModel>
             <y:ModelParameter>
-              <y:SmartNodeLabelModelParameter labelRatioX="0.0" labelRatioY="0.0" nodeRatioX="0.0" nodeRatioY="0.0" offsetX="0.0" offsetY="0.0" upX="0.0" upY="-1.0"/>
+              <y:SmartNodeLabelModelParameter labelRatioX="0.0" labelRatioY="0.0" nodeRatioX="2.220446049250313E-16" nodeRatioY="0.0" offsetX="0.0" offsetY="0.0" upX="0.0" upY="-1.0"/>
+            </y:ModelParameter>
+          </y:NodeLabel>
+        </y:GenericNode>
+      </data>
+    </node>
+    <node id="n13">
+      <data key="d6">
+        <y:GenericNode configuration="com.yworks.flowchart.process">
+          <y:Geometry height="56.0" width="268.0" x="309.6849206349206" y="373.8409153761062"/>
+          <y:Fill color="#E8EEF7" color2="#B7C9E3" transparent="false"/>
+          <y:BorderStyle color="#000000" type="line" width="1.0"/>
+          <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="18.1328125" modelName="custom" textColor="#000000" visible="true" width="205.52734375" x="31.236328125000057" y="18.93359375">Parse changelogs and get CVE IDs <y:LabelModel>
+              <y:SmartNodeLabelModel distance="4.0"/>
+            </y:LabelModel>
+            <y:ModelParameter>
+              <y:SmartNodeLabelModelParameter labelRatioX="0.0" labelRatioY="0.5" nodeRatioX="2.220446049250313E-16" nodeRatioY="0.1619001116071429" offsetX="0.0" offsetY="0.0" upX="0.0" upY="-1.0"/>
             </y:ModelParameter>
           </y:NodeLabel>
         </y:GenericNode>
@@ -231,16 +262,17 @@ Reporting<y:LabelModel>
     <edge id="e1" source="n1" target="n3">
       <data key="d10">
         <y:PolyLineEdge>
-          <y:Path sx="0.0" sy="20.0" tx="0.0" ty="-28.0"/>
+          <y:Path sx="-40.0" sy="0.0" tx="0.0" ty="-28.0">
+            <y:Point x="144.0" y="226.44247787610618"/>
+          </y:Path>
           <y:LineStyle color="#000000" type="line" width="1.0"/>
           <y:Arrows source="none" target="standard"/>
-          <y:EdgeLabel alignment="center" configuration="AutoFlippingLabel" distance="2.0" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="46.3984375" modelName="custom" preferredPlacement="anywhere" ratio="0.5" textColor="#000000" visible="true" width="46.708984375" x="-48.70899299742683" y="10.125003510871807">Debian
-Ubuntu
-CentOS<y:LabelModel>
+          <y:EdgeLabel alignment="center" configuration="AutoFlippingLabel" distance="2.0" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="32.265625" modelName="custom" preferredPlacement="anywhere" ratio="0.5" textColor="#000000" visible="true" width="46.697265625" x="-56.79057374984495" y="-34.26562148912808">Debian
+Ubuntu<y:LabelModel>
               <y:SmartEdgeLabelModel autoRotationEnabled="false" defaultAngle="0.0" defaultDistance="10.0"/>
             </y:LabelModel>
             <y:ModelParameter>
-              <y:SmartEdgeLabelModelParameter angle="6.283185307179586" distance="2.0" distanceToCenter="false" position="right" ratio="0.25625" segment="-1"/>
+              <y:SmartEdgeLabelModelParameter angle="6.283185307179586" distance="1.9999999999998863" distanceToCenter="false" position="right" ratio="0.02215389573439544" segment="0"/>
             </y:ModelParameter>
             <y:PreferredPlacementDescriptor angle="0.0" angleOffsetOnRightSide="0" angleReference="absolute" angleRotationOnRightSide="co" distance="-1.0" frozen="true" placement="anywhere" side="anywhere" sideReference="relative_to_edge_flow"/>
           </y:EdgeLabel>
@@ -281,7 +313,9 @@ CentOS<y:LabelModel>
     <edge id="e5" source="n6" target="n7">
       <data key="d10">
         <y:PolyLineEdge>
-          <y:Path sx="0.0" sy="25.0" tx="0.0" ty="-28.0"/>
+          <y:Path sx="68.5" sy="0.0" tx="0.0" ty="-28.0">
+            <y:Point x="743.3698412698412" y="570.8409153761062"/>
+          </y:Path>
           <y:LineStyle color="#000000" type="line" width="1.0"/>
           <y:Arrows source="none" target="standard"/>
           <y:BendStyle smoothed="false"/>
@@ -292,17 +326,17 @@ CentOS<y:LabelModel>
       <data key="d10">
         <y:PolyLineEdge>
           <y:Path sx="40.0" sy="0.0" tx="0.0" ty="-28.0">
-            <y:Point x="608.8396825396825" y="226.44247787610618"/>
+            <y:Point x="743.3698412698412" y="226.44247787610618"/>
           </y:Path>
           <y:LineStyle color="#000000" type="line" width="1.0"/>
           <y:Arrows source="none" target="standard"/>
-          <y:EdgeLabel alignment="center" configuration="AutoFlippingLabel" distance="2.0" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="46.3984375" modelName="custom" preferredPlacement="anywhere" ratio="0.5" textColor="#000000" visible="true" width="51.806640625" x="259.9684972369481" y="10.900394135871807">Amazon
+          <y:EdgeLabel alignment="center" configuration="AutoFlippingLabel" distance="2.0" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="46.3984375" modelName="custom" preferredPlacement="anywhere" ratio="0.5" textColor="#000000" visible="true" width="51.806640625" x="10.125014629061297" y="-48.39843398912805">Amazon
 RHEL
 FreeBSD<y:LabelModel>
               <y:SmartEdgeLabelModel autoRotationEnabled="false" defaultAngle="0.0" defaultDistance="10.0"/>
             </y:LabelModel>
             <y:ModelParameter>
-              <y:SmartEdgeLabelModelParameter angle="6.283185307179586" distance="2.0" distanceToCenter="false" position="left" ratio="0.5" segment="-1"/>
+              <y:SmartEdgeLabelModelParameter angle="6.283185307179586" distance="1.9999999999998863" distanceToCenter="false" position="left" ratio="0.022401276994204813" segment="0"/>
             </y:ModelParameter>
             <y:PreferredPlacementDescriptor angle="0.0" angleOffsetOnRightSide="0" angleReference="absolute" angleRotationOnRightSide="co" distance="-1.0" frozen="true" placement="anywhere" side="anywhere" sideReference="relative_to_edge_flow"/>
           </y:EdgeLabel>
@@ -313,9 +347,7 @@ FreeBSD<y:LabelModel>
     <edge id="e7" source="n8" target="n7">
       <data key="d10">
         <y:PolyLineEdge>
-          <y:Path sx="0.0" sy="28.0" tx="134.0" ty="0.0">
-            <y:Point x="608.8396825396825" y="683.9509027338811"/>
-          </y:Path>
+          <y:Path sx="0.0" sy="28.0" tx="0.0" ty="-28.0"/>
           <y:LineStyle color="#000000" type="line" width="1.0"/>
           <y:Arrows source="none" target="standard"/>
           <y:BendStyle smoothed="false"/>
@@ -345,7 +377,9 @@ FreeBSD<y:LabelModel>
     <edge id="e10" source="n7" target="n10">
       <data key="d10">
         <y:PolyLineEdge>
-          <y:Path sx="-134.0" sy="0.0" tx="18.41984126984127" ty="-6.049097266118906"/>
+          <y:Path sx="-134.01566143419018" sy="6.159084623893818" tx="0.0" ty="-29.333162136535975">
+            <y:Point x="480.0" y="660.0"/>
+          </y:Path>
           <y:LineStyle color="#000000" type="line" width="1.0"/>
           <y:Arrows source="none" target="none"/>
           <y:BendStyle smoothed="false"/>
@@ -355,13 +389,56 @@ FreeBSD<y:LabelModel>
     <edge id="e11" source="n11" target="n9">
       <data key="d10">
         <y:PolyLineEdge>
-          <y:Path sx="133.98838511366392" sy="2.848880368960863" tx="-55.99144850049163" ty="-2.585804760622068"/>
+          <y:Path sx="0.0" sy="28.0" tx="0.0" ty="-28.86721713021484"/>
           <y:LineStyle color="#000000" type="line" width="1.0"/>
           <y:Arrows source="none" target="none"/>
           <y:BendStyle smoothed="false"/>
         </y:PolyLineEdge>
       </data>
     </edge>
+    <edge id="e12" source="n1" target="n12">
+      <data key="d9"/>
+      <data key="d10">
+        <y:PolyLineEdge>
+          <y:Path sx="0.0" sy="20.0" tx="0.0" ty="-28.0"/>
+          <y:LineStyle color="#000000" type="line" width="1.0"/>
+          <y:Arrows source="none" target="standard"/>
+          <y:EdgeLabel alignment="center" configuration="AutoFlippingLabel" distance="2.0" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="18.1328125" modelName="custom" preferredPlacement="anywhere" ratio="0.5" textColor="#000000" visible="true" width="46.708984375" x="-53.35447755843876" y="11.632816010871807">CentOS<y:LabelModel>
+              <y:SmartEdgeLabelModel autoRotationEnabled="false" defaultAngle="0.0" defaultDistance="10.0"/>
+            </y:LabelModel>
+            <y:ModelParameter>
+              <y:SmartEdgeLabelModelParameter angle="0.0" distance="30.0" distanceToCenter="true" position="right" ratio="0.5" segment="0"/>
+            </y:ModelParameter>
+            <y:PreferredPlacementDescriptor angle="0.0" angleOffsetOnRightSide="0" angleReference="absolute" angleRotationOnRightSide="co" distance="-1.0" frozen="true" placement="anywhere" side="anywhere" sideReference="relative_to_edge_flow"/>
+          </y:EdgeLabel>
+          <y:BendStyle smoothed="false"/>
+        </y:PolyLineEdge>
+      </data>
+    </edge>
+    <edge id="e13" source="n12" target="n13">
+      <data key="d9"/>
+      <data key="d10">
+        <y:PolyLineEdge>
+          <y:Path sx="0.0" sy="28.0" tx="0.0" ty="-28.0"/>
+          <y:LineStyle color="#000000" type="line" width="1.0"/>
+          <y:Arrows source="none" target="standard"/>
+          <y:BendStyle smoothed="false"/>
+        </y:PolyLineEdge>
+      </data>
+    </edge>
+    <edge id="e14" source="n13" target="n7">
+      <data key="d9"/>
+      <data key="d10">
+        <y:PolyLineEdge>
+          <y:Path sx="134.00000000000006" sy="0.0" tx="0.0" ty="-28.0">
+            <y:Point x="743.3698412698412" y="401.8409153761062"/>
+          </y:Path>
+          <y:LineStyle color="#000000" type="line" width="1.0"/>
+          <y:Arrows source="none" target="standard"/>
+          <y:BendStyle smoothed="false"/>
+        </y:PolyLineEdge>
+      </data>
+    </edge>
   </graph>
   <data key="d7">
     <y:Resources/>
diff --git a/img/vuls-scan-flow.png b/img/vuls-scan-flow.png
index 8f361ffc..a29dbee5 100644
Binary files a/img/vuls-scan-flow.png and b/img/vuls-scan-flow.png differ