diff --git a/tests/Pipfile b/tests/Pipfile
index 89b0d698c98..ac989909ec4 100644
--- a/tests/Pipfile
+++ b/tests/Pipfile
@@ -43,5 +43,11 @@ microserver = ">=1.0.6"
 jsonschema = "*"
 python-jose = "*"
 
+# The latest version of Werkzeug (2.1.0) breaks httpbin because it removes
+# deprecated function `BaseResponse` that httpbin directly or indirectly
+# depends upon. Pinning Wekrzeug for now until httpbin or its dependencies is
+# updated for the changed API.
+Werkzeug = "==2.0.3"
+
 [requires]
 python_version = "3"