diff --git a/BE/src/main/java/com/codesquad/issuetracker/issue/domain/Issue.java b/BE/src/main/java/com/codesquad/issuetracker/issue/domain/Issue.java
index 57e3b745f..3c4b4b991 100644
--- a/BE/src/main/java/com/codesquad/issuetracker/issue/domain/Issue.java
+++ b/BE/src/main/java/com/codesquad/issuetracker/issue/domain/Issue.java
@@ -97,8 +97,20 @@ public void removeMilestone() {
     }
 
     public void updateIssue(IssueRequest issueRequest) {
+        boolean isIssueOpenRequest = issueRequest.isOpen();
+
+        if(this.open !=  isIssueOpenRequest && milestone != null) {
+            if (isIssueOpenRequest) {
+                this.milestone.openIssue();
+            }
+
+            if (!isIssueOpenRequest) {
+                this.milestone.closeIssue();
+            }
+        }
+
         this.title = issueRequest.getTitle();
-        this.open = issueRequest.isOpen();
+        this.open = isIssueOpenRequest;
     }
 
     public static Issue create(User author, String title) {
diff --git a/BE/src/main/java/com/codesquad/issuetracker/milestone/domain/Milestone.java b/BE/src/main/java/com/codesquad/issuetracker/milestone/domain/Milestone.java
index 43302f9e3..305aa61ca 100644
--- a/BE/src/main/java/com/codesquad/issuetracker/milestone/domain/Milestone.java
+++ b/BE/src/main/java/com/codesquad/issuetracker/milestone/domain/Milestone.java
@@ -69,4 +69,14 @@ public void countOpenIssuesDown() {
     public void countClosedIssuesDown() {
         this.closedIssues--;
     }
+
+    public void openIssue() {
+        this.openIssues++;
+        this.closedIssues--;
+    }
+
+    public void closeIssue() {
+        this.openIssues--;
+        this.closedIssues++;
+    }
 }