diff --git a/arXivSearches.json b/arXivSearches.json
index ba12151..5eb6f94 100644
--- a/arXivSearches.json
+++ b/arXivSearches.json
@@ -1,458 +1,818 @@
 [
   {
-    "id": "http://arxiv.org/abs/1910.12614v1",
+    "id": {
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+      "article": "1910.12614",
+      "version": "1"
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     "status": "candidate"
   },
   {
-    "id": "http://arxiv.org/abs/1809.09841v1",
+    "id": {
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+      "version": "1"
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     "status": "candidate"
   },
   {
-    "id": "http://arxiv.org/abs/1907.07769v1",
+    "id": {
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+      "version": "1"
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     "status": "candidate"
   },
   {
-    "id": "http://arxiv.org/abs/1909.06805v3",
+    "id": {
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+      "version": "2"
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     "status": "candidate"
   },
   {
-    "id": "http://arxiv.org/abs/1909.07655v2",
+    "id": {
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+      "article": "1906.10508",
+      "version": "3"
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     "status": "candidate"
   },
   {
-    "id": "http://arxiv.org/abs/1906.10508v3",
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+      "version": "1"
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   {
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   {
-    "id": "http://arxiv.org/abs/1905.05879v2",
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   {
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   {
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   {
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   {
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+      "repository": "arXiv",
+      "article": "2001.01401",
+      "version": "1"
+    },
     "status": "confirmed"
   },
   {
-    "id": "http://arxiv.org/abs/1810.06865v5",
+    "id": {
+      "repository": "arXiv",
+      "article": "1810.06865",
+      "version": "5"
+    },
     "status": "candidate"
   },
   {
-    "id": "http://arxiv.org/abs/1912.05289v2",
+    "id": {
+      "repository": "arXiv",
+      "article": "1912.05289",
+      "version": "2"
+    },
     "status": "candidate"
   },
   {
-    "id": "http://arxiv.org/abs/2001.07849v1",
-    "status": "candidate"
-  },
-  {
-    "id": "http://arxiv.org/abs/1904.07453v2",
+    "id": {
+      "repository": "arXiv",
+      "article": "1904.07453",
+      "version": "2"
+    },
     "status": "excluded"
   },
   {
-    "id": "http://arxiv.org/abs/2001.09723v1",
+    "id": {
+      "repository": "arXiv",
+      "article": "2001.09723",
+      "version": "1"
+    },
     "status": "excluded"
   },
   {
-    "id": "http://arxiv.org/abs/1912.02613v2",
-    "status": "candidate"
-  },
-  {
-    "id": "http://arxiv.org/abs/1911.02933v2",
+    "id": {
+      "repository": "arXiv",
+      "article": "1911.02933",
+      "version": "2"
+    },
     "status": "confirmed"
   },
   {
-    "id": "http://arxiv.org/abs/1909.06805v4",
-    "status": "candidate"
-  },
-  {
-    "id": "http://arxiv.org/abs/2002.00198v1",
+    "id": {
+      "repository": "arXiv",
+      "article": "1909.06805",
+      "version": "4"
+    },
     "status": "candidate"
   },
   {
-    "id": "http://arxiv.org/abs/2001.07849v2",
+    "id": {
+      "repository": "arXiv",
+      "article": "2002.00198",
+      "version": "1"
+    },
     "status": "candidate"
   },
   {
-    "id": "http://arxiv.org/abs/2001.07849v3",
+    "id": {
+      "repository": "arXiv",
+      "article": "2001.07849",
+      "version": "3"
+    },
     "status": "candidate"
   },
   {
-    "id": "http://arxiv.org/abs/2002.03808v1",
+    "id": {
+      "repository": "arXiv",
+      "article": "2002.03808",
+      "version": "1"
+    },
     "status": "confirmed"
   },
   {
-    "id": "http://arxiv.org/abs/1911.03934v2",
+    "id": {
+      "repository": "arXiv",
+      "article": "1911.03934",
+      "version": "2"
+    },
     "status": "candidate"
   },
   {
-    "id": "http://arxiv.org/abs/2002.06328v1",
+    "id": {
+      "repository": "arXiv",
+      "article": "2002.06328",
+      "version": "1"
+    },
     "status": "confirmed"
   },
   {
-    "id": "http://arxiv.org/abs/2002.06778v1",
+    "id": {
+      "repository": "arXiv",
+      "article": "2002.06778",
+      "version": "1"
+    },
     "status": "candidate"
   },
   {
-    "id": "http://arxiv.org/abs/1912.01852v2",
+    "id": {
+      "repository": "arXiv",
+      "article": "1912.01852",
+      "version": "2"
+    },
     "status": "candidate"
   },
   {
-    "id": "http://arxiv.org/abs/1912.02613v3",
+    "id": {
+      "repository": "arXiv",
+      "article": "1912.02613",
+      "version": "3"
+    },
     "status": "confirmed"
   },
   {
-    "id": "http://arxiv.org/abs/1911.01601v2",
+    "id": {
+      "repository": "arXiv",
+      "article": "1911.01601",
+      "version": "2"
+    },
     "status": "candidate"
   }
 ]
diff --git a/jest.config.js b/jest.config.js
index 5401636..ebf76fd 100644
--- a/jest.config.js
+++ b/jest.config.js
@@ -1,4 +1,5 @@
 module.exports = {
   preset: "ts-jest/presets/js-with-ts",
-  testEnvironment: "node"
+  testEnvironment: "node",
+  testPathIgnorePatterns: ["/node_modules/", "<rootDir>/dist/"]
 };
diff --git a/package-lock.json b/package-lock.json
index b38cf33..c0362ec 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5034,9 +5034,9 @@
       }
     },
     "immer": {
-      "version": "5.3.6",
-      "resolved": "https://registry.npmjs.org/immer/-/immer-5.3.6.tgz",
-      "integrity": "sha512-pqWQ6ozVfNOUDjrLfm4Pt7q4Q12cGw2HUZgry4Q5+Myxu9nmHRkWBpI0J4+MK0AxbdFtdMTwEGVl7Vd+vEiK+A=="
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/immer/-/immer-5.1.0.tgz",
+      "integrity": "sha512-t6gyFtTcokCuI0tX9KQZJQAkIjSqo/nTeJnwojfty69EzrorZbywwhZ8qNNlF+faajHeRnhOvM2F40KHLFCghQ=="
     },
     "import-fresh": {
       "version": "3.2.1",
diff --git a/package.json b/package.json
index f681bd0..486beee 100644
--- a/package.json
+++ b/package.json
@@ -53,7 +53,7 @@
     "@actions/core": "^1.2.0",
     "@actions/github": "^2.0.0",
     "@octokit/webhooks": "^7.0.0",
-    "immer": "^5.3.6",
+    "immer": "^5.1.0",
     "node-fetch": "^2.6.0",
     "oauth-1.0a": "^2.2.6",
     "strict-uri-encode": "^2.0.0",
diff --git a/src/ConfirmationAction.ts b/src/ConfirmationAction.ts
index 05eec21..1cffcb3 100644
--- a/src/ConfirmationAction.ts
+++ b/src/ConfirmationAction.ts
@@ -4,7 +4,7 @@ import { searchArXivByID } from "./arXivSearch";
 import { ArXivStorage } from "./domain";
 import { tweet } from "./twitter";
 import * as WebhooksApi from "@octokit/webhooks";
-import { updateArticleStatus } from "./updateArticles";
+import { updateArticleStatus, arXivID2identity } from "./updateArticles";
 
 async function run(): Promise<void> {
   //@ts-ignore
@@ -16,7 +16,7 @@ async function run(): Promise<void> {
   const regResult = idRegExp.exec(issueCommentPayload.issue.body);
   // regResult == null means the issue is not for article confirmation
   if (regResult != null) {
-    const id = regResult[1];
+    const arXivID = regResult[1];
 
     // extract judge
     const c = /\[vclab::confirmed\]|\[confirmed\]|vclab::confirmed/;
@@ -25,7 +25,7 @@ async function run(): Promise<void> {
     const isC = c.exec(issueCommentPayload.comment.body);
     const isE = e.exec(issueCommentPayload.comment.body);
 
-    // make thunks toward contribution
+    // make thanks toward contribution
     if (isC !== null || isE !== null) {
       const octokit = new github.GitHub(core.getInput("token"));
       // reply thunks in comment
@@ -61,29 +61,35 @@ async function run(): Promise<void> {
       );
       //// update storage
       const judgeResult = isC !== null ? "confirmed" : "excluded";
-      const newStorage = updateArticleStatus(storage, id, judgeResult);
+      const identity = arXivID2identity(arXivID);
+      const newStorage = updateArticleStatus(
+        storage,
+        identity.article,
+        judgeResult
+      );
       //// commit storage update
       const blob = Buffer.from(JSON.stringify(newStorage, undefined, 2));
       await octokit.repos
         .createOrUpdateFile({
           ...github.context.repo,
           path: "arXivSearches.json",
-          message: `Add arXiv paper confirmation ${id}`,
+          message: `Add arXiv paper confirmation ${identity.repository}-${identity.article}`,
           content: blob.toString("base64"),
           // @ts-ignore
           sha: contents.data.sha
         })
         .catch(err => core.setFailed(err));
 
+      // Tweet if "confirmed" (== VC paper)
       if (isC !== null) {
         console.log("is [vclab::confirmed]");
         const arXivIDRegResult = /http:\/\/arxiv.org\/abs\/([a-z.0-9]+)/.exec(
-          id
+          arXivID
         );
         if (arXivIDRegResult !== null) {
-          const arXivID = arXivIDRegResult[1];
-          const paper = await searchArXivByID(arXivID);
-          const content = `[[VC paper]]\n"${paper.title}"\narXiv: ${id}`;
+          const arXivSearchID = arXivIDRegResult[1];
+          const paper = await searchArXivByID(arXivSearchID);
+          const content = `[[VC paper]]\n"${paper.title}"\narXiv: ${arXivSearchID}`;
           // tweet confirmed paper
           await tweet(
             content,
@@ -101,7 +107,7 @@ async function run(): Promise<void> {
             });
           console.log("tweet created.");
         } else {
-          core.setFailed(`arXiv ID search failure for ${id}`);
+          core.setFailed(`arXiv ID search failure for ${arXivID}`);
         }
       } else if (isE !== null) {
         console.log("is [vclab::excluded]");
diff --git a/src/PullShareAction.ts b/src/PullShareAction.ts
index c64ff52..c21c63b 100644
--- a/src/PullShareAction.ts
+++ b/src/PullShareAction.ts
@@ -1,8 +1,64 @@
 import * as core from "@actions/core";
 import * as github from "@actions/github";
 import { searchArXiv } from "./arXivSearch";
-import { ArXivStorage } from "./domain";
+import {
+  ArXivStorage,
+  ArXivSearchResults,
+  ArXivRecord,
+  SearchedPaper,
+  Identity
+} from "./domain";
 import { tweet } from "./twitter";
+import { arXivID2identity } from "./updateArticles";
+
+function findNewPaper(
+  searchResults: ArXivSearchResults,
+  storage: ArXivStorage
+): [SearchedPaper, ArXivRecord] | undefined {
+  // find non-match (==new) arXivPaper (version update is excluded)
+  const newPapers = searchResults.filter(paper => {
+    const articleID = arXivID2identity(paper.id).article;
+    return storage.every(record => record.id.article !== articleID);
+  });
+  if (newPapers.length === 0) {
+    return undefined;
+  } else {
+    const theNewPaper = newPapers[0];
+    const identity = arXivID2identity(theNewPaper.id);
+    return [
+      theNewPaper,
+      {
+        id: identity,
+        status: "candidate"
+      }
+    ];
+  }
+}
+
+/**
+ * Find versionUp-ed paper in arXiv
+ */
+function findUpdatedPaper(
+  searchResults: ArXivSearchResults,
+  storage: ArXivStorage
+): [SearchedPaper, Identity] | undefined {
+  //
+  const updatedPaperCand = searchResults.find(paper => {
+    const paperID = arXivID2identity(paper.id);
+    // There is a record which match the articleID but not match version in storage
+    return storage.some(
+      record =>
+        record.id.article === paperID.article &&
+        record.id.version !== paperID.version
+    );
+  });
+  if (updatedPaperCand === undefined) {
+    return undefined;
+  } else {
+    const identity = arXivID2identity(updatedPaperCand.id);
+    return [updatedPaperCand, identity];
+  }
+}
 
 async function run(): Promise<void> {
   // fetch search result
@@ -23,26 +79,19 @@ async function run(): Promise<void> {
     ).toString()
   );
 
-  // find non-match (==new) arXivPaper
-  const newPapers = searchResults.filter(paper =>
-    storage.every(record => record.id !== paper.id)
-  );
-
-  // add to storage with [candidate] status
-  if (newPapers.length > 0) {
-    const theNewPaper = newPapers[0];
-    storage.push({
-      id: theNewPaper.id,
-      status: "candidate"
-    });
-
+  const newPaperCand = findNewPaper(searchResults, storage);
+  if (newPaperCand !== undefined) {
+    const theNewPaper = newPaperCand[0];
+    const newRecord = newPaperCand[1];
+    // storage update
+    storage.push(newPaperCand[1]);
     // commit storage update
     const blob = Buffer.from(JSON.stringify(storage, undefined, 2));
     await octokit.repos
       .createOrUpdateFile({
         ...github.context.repo,
         path: "arXivSearches.json",
-        message: `Add new arXiv search result ${theNewPaper.id}`,
+        message: `Add new arXiv search result ${newRecord.id.article}`,
         content: blob.toString("base64"),
         // @ts-ignore
         sha: contents.data.sha
@@ -54,7 +103,7 @@ async function run(): Promise<void> {
     await octokit.issues
       .create({
         ...github.context.repo,
-        title: `'Voice Conversion' paper candidate ${theNewPaper.id}`,
+        title: `'Voice Conversion' paper candidate ${newRecord.id.article}`,
         body: `Please check whether this paper is about 'Voice Conversion' or not.\n## article info.\n- title: **${theNewPaper.title}**\n- summary: ${theNewPaper.summary}\n- id: ${theNewPaper.id}\n## judge\nWrite [vclab::confirmed] or [vclab::excluded] in comment.`
       })
       .catch(err => core.setFailed(err));
@@ -76,6 +125,57 @@ async function run(): Promise<void> {
         core.setFailed(err);
       });
     console.log("tweet created.");
+    return;
+  }
+
+  // paper update (if newPaper, already returned after Tweet)
+  const updatedPaperCand = findUpdatedPaper(searchResults, storage);
+  if (updatedPaperCand !== undefined) {
+    const updatedPaper = updatedPaperCand[0];
+    const paperID = updatedPaperCand[1];
+    // storage update (version only update)
+    const indexInStorage = storage.findIndex(
+      record => record.id.article === paperID.article
+    );
+    if (indexInStorage === -1) {
+      throw new Error("this should exist");
+    }
+    const record = storage[indexInStorage];
+    record.id.version = paperID.version;
+
+    // commit storage update
+    const blob = Buffer.from(JSON.stringify(storage, undefined, 2));
+    await octokit.repos
+      .createOrUpdateFile({
+        ...github.context.repo,
+        path: "arXivSearches.json",
+        message: `Update arXiv search result ${paperID.article}@${paperID.version}`,
+        content: blob.toString("base64"),
+        // @ts-ignore
+        sha: contents.data.sha
+      })
+      .catch(err => core.setFailed(err));
+    console.log("storage updated (version update)");
+
+    // do NOT open issue because version up do not change "VC paper or not"
+
+    // tweet candidate info
+    await tweet(
+      `[paper version up]\n"${updatedPaper.title}"\narXiv: ${updatedPaper.id}`,
+      core.getInput("twi-cons-key"),
+      core.getInput("twi-cons-secret"),
+      core.getInput("twi-token-key"),
+      core.getInput("twi-token-secret")
+    )
+      .then(res => {
+        console.log(res.status);
+        return res.text();
+      })
+      .catch(err => {
+        core.setFailed(err);
+      });
+    console.log("tweet created.");
+    return;
   }
 }
 
diff --git a/src/domain.ts b/src/domain.ts
index a2972db..d237d65 100644
--- a/src/domain.ts
+++ b/src/domain.ts
@@ -9,8 +9,13 @@ export type ArXivSearchResults = SearchedPaper[];
 // points: this is merely arXiv search result storage (status is for refined search)
 export type candidate = "candidate";
 export type resolved = "confirmed" | "excluded";
+export type Identity = {
+  repository: "arXiv";
+  article: string;
+  version: string;
+};
 export type ArXivRecord = {
-  id: string;
+  id: Identity;
   status: candidate | resolved;
 };
 export type ArXivStorage = ArXivRecord[];
diff --git a/src/updateArticles.test.ts b/src/updateArticles.test.ts
index 93268d7..a69d71a 100644
--- a/src/updateArticles.test.ts
+++ b/src/updateArticles.test.ts
@@ -4,11 +4,11 @@ import { ArXivStorage } from "./domain";
 test("updateArticles", () => {
   const input: ArXivStorage = [
     {
-      id: "1",
+      id: { repository: "arXiv", article: "1", version: "1" },
       status: "candidate"
     },
     {
-      id: "2",
+      id: { repository: "arXiv", article: "2", version: "2" },
       status: "candidate"
     }
   ];
@@ -16,11 +16,11 @@ test("updateArticles", () => {
 
   const expected: ArXivStorage = [
     {
-      id: "1",
+      id: { repository: "arXiv", article: "1", version: "1" },
       status: "candidate"
     },
     {
-      id: "2",
+      id: { repository: "arXiv", article: "2", version: "2" },
       status: "confirmed"
     }
   ];
diff --git a/src/updateArticles.ts b/src/updateArticles.ts
index cc9d9f8..358a30d 100644
--- a/src/updateArticles.ts
+++ b/src/updateArticles.ts
@@ -1,14 +1,27 @@
-import { ArXivStorage, resolved } from "./domain";
+import { ArXivStorage, resolved, Identity } from "./domain";
 import { produce } from "immer";
 
+export function arXivID2identity(arXivID: string): Identity {
+  const result = /http:\/\/arxiv.org\/abs\/(\d+\.\d+)v(\d+)/.exec(arXivID);
+  if (result && result.length >= 3) {
+    return {
+      repository: "arXiv",
+      article: result[1],
+      version: result[2]
+    };
+  } else {
+    throw new Error("arXivID parse error");
+  }
+}
+
 export function updateArticleStatus(
   storage: ArXivStorage,
-  id: string,
+  articleID: string,
   status: resolved
 ): ArXivStorage {
   return produce(storage, draft => {
     // find index
-    const index = draft.findIndex(paper => paper.id === id);
+    const index = draft.findIndex(paper => paper.id.article === articleID);
     draft[index].status = status;
   });
 }