diff --git a/apps/api/plane/api/serializers/issue.py b/apps/api/plane/api/serializers/issue.py
index 048de6e92b..e3fabe64ac 100644
--- a/apps/api/plane/api/serializers/issue.py
+++ b/apps/api/plane/api/serializers/issue.py
@@ -69,7 +69,7 @@ class IssueSerializer(BaseSerializer):
 
     class Meta:
         model = Issue
-        read_only_fields = ["id", "workspace", "project", "updated_by", "updated_at"]
+        read_only_fields = ["id", "workspace", "project", "updated_by", "updated_at", "completed_at"]
         exclude = ["description_json", "description_stripped"]
 
     def validate(self, data):
@@ -850,6 +850,7 @@ class IssueExpandSerializer(BaseSerializer):
             "updated_by",
             "created_at",
             "updated_at",
+            "completed_at",
         ]
 
 
diff --git a/apps/api/plane/app/serializers/issue.py b/apps/api/plane/app/serializers/issue.py
index c5af9b9ffe..673a557061 100644
--- a/apps/api/plane/app/serializers/issue.py
+++ b/apps/api/plane/app/serializers/issue.py
@@ -110,6 +110,7 @@ class IssueCreateSerializer(BaseSerializer):
             "updated_by",
             "created_at",
             "updated_at",
+            "completed_at",
         ]
 
     def to_representation(self, instance):