[tests] Fix werkzeug dependency to make py3.8 test run again

Change-Id: Ib5df72bc36bcea1b1d34caae3f7f8737b5f5e4e5
---
M dev-requirements.txt
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/dev-requirements.txt b/dev-requirements.txt
index 6b0c177..a5c203b 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -7,8 +7,8 @@
 pytest-cov>=2.6.1
 pytest-attrib>=0.1.3
 # pytest-httpbin needs httpbin needs werkzeug >=0.14.1
-# but werkzeug > 0.15.2 fails for Python 3.8
-werkzeug != 0.15.3, != 0.15.4 ; python_version >= '3.8'
+# but werkzeug >= 0.15.0, < 0.15.5 fails for Python 3.8
+werkzeug != 0.15.0, != 0.15.1, != 0.15.2, != 0.15.3, != 0.15.4 ; python_version >= '3.8'
 pytest-httpbin
 
 six

