diff --git a/tools/interop_matrix/client_matrix.py b/tools/interop_matrix/client_matrix.py
index 1cba1748313..6bd6f589efb 100644
--- a/tools/interop_matrix/client_matrix.py
+++ b/tools/interop_matrix/client_matrix.py
@@ -213,6 +213,8 @@ LANG_RELEASE_MATRIX = {
             ('v1.24.0', ReleaseInfo()),
             ('v1.25.0', ReleaseInfo()),
             ('v1.26.0', ReleaseInfo()),
+            ('v1.27.2', ReleaseInfo()),
+            ('v1.28.0', ReleaseInfo()),
         ]),
     'python':
         OrderedDict([