diff --git a/Pipfile.lock b/Pipfile.lock
index 56200e0..b1c5c65 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -80,11 +80,12 @@
         },
         "six": {
             "hashes": [
-                "sha256:1e61c37477a1626458e36f7b1d82aa5c9b094fa4802892072e49de9c60c4c926",
-                "sha256:8abb2f1d86890a2dfb989f9a77cfcfd3e47c2a354b01111771326f8aa26e0254"
+                "sha256:4721f391ed90541fddacab5acf947aa0d3dc7d27b2e1e8eda2be8970586c3274",
+                "sha256:ff70335d468e7eb6ec65b95b99d3a2836546063f63acc5171de367e834932a81"
             ],
             "index": "pypi",
-            "version": "==1.16.0"
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
+            "version": "==1.17.0"
         }
     },
     "develop": {