diff --git a/tools/interop_matrix/client_matrix.py b/tools/interop_matrix/client_matrix.py
index 65b7c8580c6..17518d0433d 100644
--- a/tools/interop_matrix/client_matrix.py
+++ b/tools/interop_matrix/client_matrix.py
@@ -218,6 +218,7 @@ LANG_RELEASE_MATRIX = {
             ('v1.26.1', ReleaseInfo()),
             ('v1.27.2', ReleaseInfo()),
             ('v1.28.0', ReleaseInfo()),
+            ('v1.29.0', ReleaseInfo()),
         ]),
     'python':
         OrderedDict([