diff --git a/src/main/scala/gitbucket/core/controller/api/ApiIssueCommentControllerBase.scala b/src/main/scala/gitbucket/core/controller/api/ApiIssueCommentControllerBase.scala
index 574d16e..353f570 100644
--- a/src/main/scala/gitbucket/core/controller/api/ApiIssueCommentControllerBase.scala
+++ b/src/main/scala/gitbucket/core/controller/api/ApiIssueCommentControllerBase.scala
@@ -75,9 +75,40 @@
   })
 
   /*
-   * v. Edit a comment
-   * https://developer.github.com/v3/issues/comments/#edit-a-comment
+   * v. Update an issue comment
+   * https://docs.github.com/en/rest/reference/issues#update-an-issue-comment
    */
+  patch("/api/v3/repos/:owner/:repository/issues/comments/:id")(readableUsersOnly { repository =>
+    val commentId = params("id")
+    val result = for {
+      issueComment <- getComment(repository.owner, repository.name, commentId)
+      issue <- getIssue(repository.owner, repository.name, issueComment.issueId.toString)
+    } yield {
+      if (isEditable(repository.owner, repository.name, issueComment.commentedUserName)) {
+        val body = extractFromJsonBody[CreateAComment].map(_.body)
+        updateCommentByApi(repository, issue, issueComment.commentId.toString, body)
+        getComment(repository.owner, repository.name, commentId) match {
+          case Some(issueComment) =>
+            JsonFormat(
+              ApiComment(
+                issueComment,
+                RepositoryName(repository),
+                issue.issueId,
+                ApiUser(context.loginAccount.get),
+                issue.isPullRequest
+              )
+            )
+          case _ =>
+        }
+      } else {
+        Unauthorized()
+      }
+    }
+    result match {
+      case Some(response) => response
+      case None           => NotFound()
+    }
+  })
 
   /*
    * vi. Delete a comment
diff --git a/src/main/scala/gitbucket/core/plugin/IssueHook.scala b/src/main/scala/gitbucket/core/plugin/IssueHook.scala
index 1b22971..4b026cc 100644
--- a/src/main/scala/gitbucket/core/plugin/IssueHook.scala
+++ b/src/main/scala/gitbucket/core/plugin/IssueHook.scala
@@ -13,6 +13,10 @@
     implicit session: Session,
     context: Context
   ): Unit = ()
+  def updatedComment(commentId: Int, content: String, issue: Issue, repository: RepositoryInfo)(
+    implicit session: Session,
+    context: Context
+  ): Unit = ()
   def closed(issue: Issue, repository: RepositoryInfo)(implicit session: Session, context: Context): Unit = ()
   def reopened(issue: Issue, repository: RepositoryInfo)(implicit session: Session, context: Context): Unit = ()
   def assigned(
diff --git a/src/main/scala/gitbucket/core/service/HandleCommentService.scala b/src/main/scala/gitbucket/core/service/HandleCommentService.scala
index 0417ca7..fc35896 100644
--- a/src/main/scala/gitbucket/core/service/HandleCommentService.scala
+++ b/src/main/scala/gitbucket/core/service/HandleCommentService.scala
@@ -134,4 +134,42 @@
       }
     }
   }
+
+  def updateCommentByApi(
+    repository: RepositoryService.RepositoryInfo,
+    issue: Issue,
+    commentId: String,
+    content: Option[String]
+  )(implicit context: Context, s: Session): Option[(Issue, Int)] = {
+    context.loginAccount.flatMap { loginAccount =>
+      defining(repository.owner, repository.name) {
+        case (owner, name) =>
+          val userName = loginAccount.userName
+          content match {
+            case Some(content) =>
+              // Update comment
+              val _commentId = Some(updateComment(issue.issueId, commentId.toInt, content))
+              // Record comment activity
+              val commentInfo = if (issue.isPullRequest) {
+                PullRequestCommentInfo(owner, name, userName, content, issue.issueId)
+              } else {
+                IssueCommentInfo(owner, name, userName, content, issue.issueId)
+              }
+              recordActivity(commentInfo)
+              // extract references and create refer comment
+              createReferComment(owner, name, issue, content, loginAccount)
+              // call web hooks
+              commentId foreach (callIssueCommentWebHook(repository, issue, _, loginAccount, context.settings))
+              // call hooks
+              if (issue.isPullRequest)
+                PluginRegistry().getPullRequestHooks
+                  .foreach(_.updatedComment(commentId.toInt, content, issue, repository))
+              else
+                PluginRegistry().getIssueHooks.foreach(_.updatedComment(commentId.toInt, content, issue, repository))
+              _commentId.map(issue -> _)
+            case _ => None
+          }
+      }
+    }
+  }
 }