diff --git a/client-python/setup.cfg b/client-python/setup.cfg
index a7ba522f9afe..29968ab9721f 100644
--- a/client-python/setup.cfg
+++ b/client-python/setup.cfg
@@ -59,7 +59,7 @@ install_requires =
 
 [options.extras_require]
 dev =
-    black~=26.3.0
+    black~=26.5.0
     build~=1.4.0
     isort~=8.0.0
     types-pytz~=2026.1.1.20260304
diff --git a/client-python/test-requirements.txt b/client-python/test-requirements.txt
index b840fab929fa..ca80f1751beb 100644
--- a/client-python/test-requirements.txt
+++ b/client-python/test-requirements.txt
@@ -1,4 +1,4 @@
-black==26.3.1
+black==26.5.0
 build>=0.7
 isort>=5.10
 pre-commit~=4.2