diff --git a/tools/interop_matrix/client_matrix.py b/tools/interop_matrix/client_matrix.py
index 655b8fa94e0..273fb6fe3fe 100644
--- a/tools/interop_matrix/client_matrix.py
+++ b/tools/interop_matrix/client_matrix.py
@@ -106,6 +106,7 @@ LANG_RELEASE_MATRIX = {
             ('v1.26.0', ReleaseInfo()),
             ('v1.27.3', ReleaseInfo()),
             ('v1.30.0', ReleaseInfo()),
+            ('v1.31.1', ReleaseInfo()),
         ]),
     'go':
         OrderedDict([
@@ -278,6 +279,7 @@ LANG_RELEASE_MATRIX = {
             ('v1.26.0', ReleaseInfo(runtimes=['python'])),
             ('v1.27.3', ReleaseInfo(runtimes=['python'])),
             ('v1.30.0', ReleaseInfo(runtimes=['python'])),
+            ('v1.31.1', ReleaseInfo(runtimes=['python'])),
         ]),
     'node':
         OrderedDict([
@@ -337,6 +339,7 @@ LANG_RELEASE_MATRIX = {
             ('v1.26.0', ReleaseInfo()),
             ('v1.27.3', ReleaseInfo()),
             ('v1.30.0', ReleaseInfo()),
+            ('v1.31.1', ReleaseInfo()),
         ]),
     'php':
         OrderedDict([
@@ -369,6 +372,7 @@ LANG_RELEASE_MATRIX = {
             ('v1.26.0', ReleaseInfo()),
             ('v1.27.3', ReleaseInfo()),
             ('v1.30.0', ReleaseInfo()),
+            ('v1.31.1', ReleaseInfo()),
         ]),
     'csharp':
         OrderedDict([
@@ -406,5 +410,6 @@ LANG_RELEASE_MATRIX = {
             ('v1.26.0', ReleaseInfo()),
             ('v1.27.3', ReleaseInfo()),
             ('v1.30.0', ReleaseInfo()),
+            ('v1.31.1', ReleaseInfo()),
         ]),
 }