diff --git a/dev-requirements.txt b/dev-requirements.txt
index cc52731..e7bd445 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -18,9 +18,9 @@ six==1.11.0 \
 atomicwrites==1.1.5 \
     --hash=sha256:a24da68318b08ac9c9c45029f4a10371ab5b20e4226738e150e6e7c571630ae6 \
     --hash=sha256:240831ea22da9ab882b551b31d4225591e5e447a68c5e188db5b89ca1d487585
-py==1.5.3 \
-    --hash=sha256:983f77f3331356039fdd792e9220b7b8ee1aa6bd2b25f567a963ff1de5a64f6a \
-    --hash=sha256:29c9fab495d7528e80ba1e343b958684f4ace687327e6f789a94bf3d1915f881
+py==1.10.0 \
+    --hash=sha256:3b80836aa6d1feeaa108e046da6423ab8f6ceda6468545ae8d02d9d58d18818a \
+    --hash=sha256:21b81bda15b66ef5e1a777a21c4dcd9c20ad3efd0b3f817e7a809035269e1bd3
 black==18.6b2 \
     --hash=sha256:3efe92eafbde15f8ac06478de11cfb84e47504896ccdde64507e751d2f91ec3a \
     --hash=sha256:fc26c4ab28c541fb824f59fa83d5702f75829495d5a1dee603b29bc4fbe79095