diff --git a/tools/interop_matrix/client_matrix.py b/tools/interop_matrix/client_matrix.py
index 54cbaa38b68..87e81353649 100644
--- a/tools/interop_matrix/client_matrix.py
+++ b/tools/interop_matrix/client_matrix.py
@@ -418,6 +418,7 @@ LANG_RELEASE_MATRIX = {
             ("v1.51.1", ReleaseInfo()),
             ("v1.52.0", ReleaseInfo()),
             ("v1.54.0", ReleaseInfo()),
+            ("v1.56.0", ReleaseInfo()),
         ]
     ),
     "python": OrderedDict(