diff --git a/Pipfile.lock b/Pipfile.lock
index e4e134e..b59061c 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -133,11 +133,12 @@
         },
         "python-dateutil": {
             "hashes": [
-                "sha256:0123cacc1627ae19ddf3c27a5de5bd67ee4586fbdd6440d9748f8abb483d3e86",
-                "sha256:961d03dc3453ebbc59dbdea9e4e11c5651520a876d0f4db161e8674aae935da9"
+                "sha256:37dd54208da7e1cd875388217d5e00ebd4179249f90fb72437e91a35459a0ad3",
+                "sha256:a8b2bc7bffae282281c8140a97d3aa9c14da0b136dfe83f850eea9a5f7470427"
             ],
             "index": "pypi",
-            "version": "==2.8.2"
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
+            "version": "==2.9.0.post0"
         },
         "requests": {
             "hashes": [