diff --git a/requirements-testing.txt b/requirements-testing.txt
index 7c2f1cb2..0130a6c2 100644
--- a/requirements-testing.txt
+++ b/requirements-testing.txt
@@ -16,7 +16,7 @@ mccabe==0.6.1
 pylint==2.12.2
 rope==0.22.0
 # Required by test_http2.py
-httpx==0.20.0
+httpx==0.21.3
 h2==4.1.0
 hpack==4.0.0
 hyperframe==6.0.1