Index: tox.ini
diff --git a/tox.ini b/tox.ini
index 9351bed74ac63ce1ac3ef653b8675ad76a03df61..e32a9c80ae005f54fa26a653b7ab9dd4c10f34e6 100644
--- a/tox.ini
+++ b/tox.ini
@@ -20,9 +20,9 @@ setenv =
 deps =
     flask
     jinja2
-    urllib3
+    urllib3==1.23
     markdown
-    pytest
+    pytest==3.8.2
     pytest-cov
     mock
     wsgi_intercept