diff --git a/dev_requirements.txt b/dev_requirements.txt
--- a/dev_requirements.txt
+++ b/dev_requirements.txt
@@ -1,10 +1,10 @@
-babel >= 0.9.6, < 2.4
+Babel >= 0.9.6, < 2.4
 waitress >= 0.8.8, < 1.0
-pytest ~= 3.0, >= 3.3.0
+pytest >= 3.3.0, < 4
 pytest-runner
-pytest-sugar>=0.7.0
+pytest-sugar >= 0.7.0
 pytest-benchmark
 pytest-localserver
 mock
-sphinx
-webtest < 3
+Sphinx
+WebTest < 3