diff --git a/apps/api/plane/tests/unit/utils/test_issue_filters.py b/apps/api/plane/tests/unit/utils/test_issue_filters.py
new file mode 100644
index 00000000000..203c7078b17
--- /dev/null
+++ b/apps/api/plane/tests/unit/utils/test_issue_filters.py
@@ -0,0 +1,51 @@
+# Copyright (c) 2023-present Plane Software, Inc. and contributors
+# SPDX-License-Identifier: AGPL-3.0-only
+# See the LICENSE file for details.
+
+import pytest
+
+from plane.utils.issue_filters import filter_updated_at
+
+
+@pytest.mark.unit
+class TestFilterUpdatedAt:
+    """Regression test for the "Updated At" filter bug — the filter was
+    applying to the `created_at` column instead of `updated_at`, so work
+    items updated today but created earlier never showed up under
+    `Updated At -> is -> today`. See issue #9316."""
+
+    def test_get_method_targets_updated_at_column(self):
+        issue_filter = {}
+        params = {"updated_at": "2026-06-26"}
+        filter_updated_at(params, issue_filter, method="GET")
+        # The filter must key on updated_at, not created_at.
+        assert "updated_at__date" in issue_filter
+        assert not any("created_at" in key for key in issue_filter)
+
+    def test_get_method_with_csv_targets_updated_at_column(self):
+        issue_filter = {}
+        params = {"updated_at": "2026-06-25,2026-06-26"}
+        filter_updated_at(params, issue_filter, method="GET")
+        assert all("updated_at" in key for key in issue_filter)
+        assert not any("created_at" in key for key in issue_filter)
+
+    def test_post_method_targets_updated_at_column(self):
+        issue_filter = {}
+        params = {"updated_at": ["2026-06-26"]}
+        filter_updated_at(params, issue_filter, method="POST")
+        assert all("updated_at" in key for key in issue_filter)
+        assert not any("created_at" in key for key in issue_filter)
+
+    def test_get_method_with_prefix_targets_updated_at_column(self):
+        issue_filter = {}
+        params = {"updated_at": "2026-06-26"}
+        filter_updated_at(params, issue_filter, method="GET", prefix="cycle_issue__")
+        keys = list(issue_filter)
+        assert any("cycle_issue__updated_at" in k for k in keys)
+        assert not any("created_at" in k for k in keys)
+
+    def test_empty_get_filter_is_noop(self):
+        issue_filter = {}
+        params = {"updated_at": ""}
+        filter_updated_at(params, issue_filter, method="GET")
+        assert issue_filter == {}
\ No newline at end of file
diff --git a/apps/api/plane/utils/issue_filters.py b/apps/api/plane/utils/issue_filters.py
index ea31a529bb4..3669d8a1ad8 100644
--- a/apps/api/plane/utils/issue_filters.py
+++ b/apps/api/plane/utils/issue_filters.py
@@ -231,14 +231,14 @@ def filter_updated_at(params, issue_filter, method, prefix=""):
         if len(updated_ats) and "" not in updated_ats:
             date_filter(
                 issue_filter=issue_filter,
-                date_term=f"{prefix}created_at__date",
+                date_term=f"{prefix}updated_at__date",
                 queries=updated_ats,
             )
     else:
         if params.get("updated_at", None) and len(params.get("updated_at")):
             date_filter(
                 issue_filter=issue_filter,
-                date_term=f"{prefix}created_at__date",
+                date_term=f"{prefix}updated_at__date",
                 queries=params.get("updated_at", []),
             )
     return issue_filter