diff --git a/tools/interop_matrix/client_matrix.py b/tools/interop_matrix/client_matrix.py
index a6cdccafa3f..dd0b728f6ac 100644
--- a/tools/interop_matrix/client_matrix.py
+++ b/tools/interop_matrix/client_matrix.py
@@ -194,6 +194,7 @@ LANG_RELEASE_MATRIX = {
         ('v1.23.0', ReleaseInfo()),
         ('v1.24.0', ReleaseInfo()),
         ('v1.25.0', ReleaseInfo()),
+        ('v1.26.0', ReleaseInfo()),
     ]),
     'python':
     OrderedDict([