diff --git a/css-inline/tests/requirements-test.in b/css-inline/tests/requirements-test.in
index c5fce02..2df625a 100644
--- a/css-inline/tests/requirements-test.in
+++ b/css-inline/tests/requirements-test.in
@@ -1,3 +1,3 @@
 # Python 3.7 compatibility
 flask<2.3
-werkzeug<2.3
+werkzeug<3.1
diff --git a/css-inline/tests/requirements-test.txt b/css-inline/tests/requirements-test.txt
index 76c41fb..faab9fb 100644
--- a/css-inline/tests/requirements-test.txt
+++ b/css-inline/tests/requirements-test.txt
@@ -16,7 +16,7 @@ markupsafe==2.1.3
     # via
     #   jinja2
     #   werkzeug
-werkzeug==2.2.3
+werkzeug==3.0.6
     # via
     #   -r requirements-test.in
     #   flask