diff --git a/Pipfile b/Pipfile
index 0e73cff..bc8090a 100644
--- a/Pipfile
+++ b/Pipfile
@@ -12,4 +12,4 @@ cryptography = "*"
 [dev-packages]
 
 [requires]
-python_version = "2.7"
+python_version = "3.6"