diff --git a/tools/interop_matrix/client_matrix.py b/tools/interop_matrix/client_matrix.py
index abaac04b160..1cba1748313 100644
--- a/tools/interop_matrix/client_matrix.py
+++ b/tools/interop_matrix/client_matrix.py
@@ -212,6 +212,7 @@ LANG_RELEASE_MATRIX = {
             ('v1.23.0', ReleaseInfo()),
             ('v1.24.0', ReleaseInfo()),
             ('v1.25.0', ReleaseInfo()),
+            ('v1.26.0', ReleaseInfo()),
         ]),
     'python':
         OrderedDict([