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
-waitress >= 0.8.8, < 1.0
-pytest >= 3.3.0, < 4
-pytest-runner
-pytest-sugar >= 0.7.0
-pytest-benchmark
-pytest-localserver
-mock
-Sphinx
-WebTest < 3
+Babel >= 0.9.6, < 2.7
+pytest >= 3.3.0, < 3.8
+pytest-runner < 4.3
+pytest-sugar >= 0.7.0, < 0.10
+pytest-benchmark < 3.2
+pytest-localserver < 0.5
+mock < 2.1
+Sphinx < 1.8
+WebTest < 2.1
+WebOb >= 1.7, < 1.8 # turbogears2 2.3.12 requires WebOb<1.8.0, WebTest has WebOb>=1.2