diff --git a/ctci_solutions/requirements.txt b/ctci_solutions/requirements.txt
index 16a61fe..0d58c3b 100644
--- a/ctci_solutions/requirements.txt
+++ b/ctci_solutions/requirements.txt
@@ -3,7 +3,7 @@ attrs==18.2.0
 coverage==4.5.1
 more-itertools==4.3.0
 pluggy==0.7.1
-py==1.6.0
+py==1.10.0
 pytest==3.8.1
 pytest-cov==2.6.0
 six==1.11.0
\ No newline at end of file