diff --git a/tools/interop_matrix/client_matrix.py b/tools/interop_matrix/client_matrix.py
index 655b8fa94e0..aa07166d0ad 100644
--- a/tools/interop_matrix/client_matrix.py
+++ b/tools/interop_matrix/client_matrix.py
@@ -221,7 +221,7 @@ LANG_RELEASE_MATRIX = {
             ('v1.28.1', ReleaseInfo()),
             ('v1.29.0', ReleaseInfo()),
             ('v1.30.2', ReleaseInfo()),
-            ('v1.31.0', ReleaseInfo()),
+            ('v1.31.1', ReleaseInfo()),
         ]),
     'python':
         OrderedDict([