diff --git a/testing/web-platform/tests/tools/requirements_mypy.txt b/testing/web-platform/tests/tools/requirements_mypy.txt
index 75cf41e79ec64..c310cde3062c7 100644
--- a/testing/web-platform/tests/tools/requirements_mypy.txt
+++ b/testing/web-platform/tests/tools/requirements_mypy.txt
@@ -3,7 +3,7 @@ mypy-extensions==0.4.3
 toml==0.10.2
 typed-ast==1.5.4
 types-atomicwrites==1.4.5
-types-python-dateutil==2.8.16
+types-python-dateutil==2.8.17
 types-PyYAML==6.0.7
 types-requests==2.27.29
 types-setuptools==57.4.17