diff --git a/dev-requirements.txt b/dev-requirements.txt
index 5e400f8..a640392 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -3,7 +3,7 @@ invoke==1.1.0
 
 # Testing
 pytest==3.6.3
-tox==3.0.0
+tox==3.1.2
 
 # Syntax checking
 flake8==3.5.0