diff --git a/src/main/scala/app/PullRequestsController.scala b/src/main/scala/app/PullRequestsController.scala
index a7c85cd..0f08602 100644
--- a/src/main/scala/app/PullRequestsController.scala
+++ b/src/main/scala/app/PullRequestsController.scala
@@ -260,7 +260,7 @@
         val originBranch = JGitUtil.getDefaultBranch(oldGit, originRepository, tmpOriginBranch).get._2
         val forkedBranch = JGitUtil.getDefaultBranch(newGit, forkedRepository, tmpForkedBranch).get._2
 
-        val forkedId = getForkedCommitId(oldGit, newGit,
+        val forkedId = JGitUtil.getForkedCommitId(oldGit, newGit,
           originRepository.owner, originRepository.name, originBranch,
           forkedRepository.owner, forkedRepository.name, forkedBranch)
 
@@ -432,17 +432,6 @@
       (defaultOwner, value)
     }
 
-  /**
-   * Returns the identifier of the root commit (or latest merge commit) of the specified branch.
-   */
-  private def getForkedCommitId(oldGit: Git, newGit: Git, userName: String, repositoryName: String, branch: String,
-      requestUserName: String, requestRepositoryName: String, requestBranch: String): String =
-    defining(JGitUtil.getAllCommitIds(oldGit)){ existIds =>
-      JGitUtil.getCommitLogs(newGit, requestBranch, true) { commit =>
-        existIds.contains(commit.name) && JGitUtil.getBranchesOfCommit(oldGit, commit.getName).contains(branch)
-      }.head.id
-    }
-
   private def getRequestCompareInfo(userName: String, repositoryName: String, branch: String,
       requestUserName: String, requestRepositoryName: String, requestCommitId: String): (Seq[Seq[CommitInfo]], Seq[DiffInfo]) =
     using(
diff --git a/src/main/scala/service/PullRequestService.scala b/src/main/scala/service/PullRequestService.scala
index 7d11f08..1298493 100644
--- a/src/main/scala/service/PullRequestService.scala
+++ b/src/main/scala/service/PullRequestService.scala
@@ -18,6 +18,9 @@
   def updateCommitIdTo(owner: String, repository: String, issueId: Int, commitIdTo: String): Unit =
     Query(PullRequests).filter(_.byPrimaryKey(owner, repository, issueId)).map(_.commitIdTo).update(commitIdTo)
 
+  def updateCommitIdFrom(owner: String, repository: String, issueId: Int, commitIdFrom: String): Unit =
+    Query(PullRequests).filter(_.byPrimaryKey(owner, repository, issueId)).map(_.commitIdFrom).update(commitIdFrom)
+
   def getPullRequestCountGroupByUser(closed: Boolean, owner: String, repository: Option[String]): List[PullRequestCount] =
     Query(PullRequests)
       .innerJoin(Issues).on { (t1, t2) => t1.byPrimaryKey(t2.userName, t2.repositoryName, t2.issueId) }
diff --git a/src/main/scala/servlet/GitRepositoryServlet.scala b/src/main/scala/servlet/GitRepositoryServlet.scala
index 389c1af..94f0521 100644
--- a/src/main/scala/servlet/GitRepositoryServlet.scala
+++ b/src/main/scala/servlet/GitRepositoryServlet.scala
@@ -218,14 +218,21 @@
   private def updatePullRequests(branch: String) =
     getPullRequestsByRequest(owner, repository, branch, false).foreach { pullreq =>
       if(getRepository(pullreq.userName, pullreq.repositoryName, baseUrl).isDefined){
-        using(Git.open(Directory.getRepositoryDir(pullreq.userName, pullreq.repositoryName))){ git =>
-          git.fetch
+        using(Git.open(Directory.getRepositoryDir(pullreq.userName, pullreq.repositoryName)),
+              Git.open(Directory.getRepositoryDir(pullreq.requestUserName, pullreq.requestRepositoryName))){ (oldGit, newGit) =>
+          oldGit.fetch
             .setRemote(Directory.getRepositoryDir(owner, repository).toURI.toString)
             .setRefSpecs(new RefSpec(s"refs/heads/${branch}:refs/pull/${pullreq.issueId}/head").setForceUpdate(true))
             .call
 
-          val commitIdTo = git.getRepository.resolve(s"refs/pull/${pullreq.issueId}/head").getName
+          val commitIdTo = oldGit.getRepository.resolve(s"refs/pull/${pullreq.issueId}/head").getName
           updateCommitIdTo(pullreq.userName, pullreq.repositoryName, pullreq.issueId, commitIdTo)
+
+          val commitIdFrom = JGitUtil.getForkedCommitId(oldGit, newGit,
+            pullreq.userName, pullreq.repositoryName, pullreq.branch,
+            pullreq.requestUserName, pullreq.requestRepositoryName, pullreq.requestBranch)
+          // TODO(tanacasino): commitIdFrom and commitIdTo should be updated by one query...
+          updateCommitIdFrom(pullreq.userName, pullreq.repositoryName, pullreq.issueId, commitIdFrom)
         }
       }
     }
diff --git a/src/main/scala/util/JGitUtil.scala b/src/main/scala/util/JGitUtil.scala
index 97e8c41..9f48c39 100644
--- a/src/main/scala/util/JGitUtil.scala
+++ b/src/main/scala/util/JGitUtil.scala
@@ -617,5 +617,16 @@
     }
   }
 
+  /**
+   * Returns the identifier of the root commit (or latest merge commit) of the specified branch.
+   */
+  def getForkedCommitId(oldGit: Git, newGit: Git,
+                        userName: String, repositoryName: String, branch: String,
+                        requestUserName: String, requestRepositoryName: String, requestBranch: String): String =
+    defining(getAllCommitIds(oldGit)){ existIds =>
+      getCommitLogs(newGit, requestBranch, true) { commit =>
+        existIds.contains(commit.name) && getBranchesOfCommit(oldGit, commit.getName).contains(branch)
+      }.head.id
+    }
 
 }