diff --git a/requirements-dev.txt b/requirements-dev.txt
index 61f007c..254bd7b 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -5,7 +5,7 @@ pyflakes==2.0.0
 
 # Deps do pytest
 py==1.5.3
-atomicwrites==1.0
+atomicwrites==1.2.1
 more-itertools==4.0.0
 six==1.10.0
 attrs==17.4.0