diff --git a/requirements-dev.txt b/requirements-dev.txt
index 7620422..77420ed 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -2,11 +2,18 @@
 -e .
 pytest==3.4.1
 pytest-cov==2.5.1
-
+radon==2.2.0
 
 # Secondary requirements
 attrs==17.4.0
+colorama==0.3.9
 coverage==4.5.1
+flake8==3.5.0
+flake8-polyfill==1.0.2
+mando==0.6.4
+mccabe==0.6.1
 pluggy==0.6.0
 py==1.5.2
+pycodestyle==2.3.1
+pyflakes==1.6.0
 six==1.11.0