diff --git a/Pipfile b/Pipfile
index 8d6b577..07ede90 100644
--- a/Pipfile
+++ b/Pipfile
@@ -9,7 +9,7 @@ test = "pytest ."
 [packages]
 google-api-python-client = "~=2.187.0"
 google-auth-oauthlib = "~=1.0.0"
-python-dateutil = "~=2.8.2"
+python-dateutil = "~=2.9.0"
 
 [requires]
 python_version = "3"
diff --git a/Pipfile.lock b/Pipfile.lock
index d76e5e8..4179d64 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "46a41c1a48ef442fcf990b00d45ab6ae7e7ff09a7899ff9457fdda684ef918ff"
+            "sha256": "63e9c1a7f3dbebf321afed7f6daaa87e8dbb331bdfdbb697ee567d2ca4558269"
         },
         "pipfile-spec": 6,
         "requires": {
@@ -274,11 +274,12 @@
         },
         "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'",
+            "version": "==2.9.0.post0"
         },
         "requests": {
             "hashes": [
@@ -306,11 +307,11 @@
         },
         "six": {
             "hashes": [
-                "sha256:1e61c37477a1626458e36f7b1d82aa5c9b094fa4802892072e49de9c60c4c926",
-                "sha256:8abb2f1d86890a2dfb989f9a77cfcfd3e47c2a354b01111771326f8aa26e0254"
+                "sha256:4721f391ed90541fddacab5acf947aa0d3dc7d27b2e1e8eda2be8970586c3274",
+                "sha256:ff70335d468e7eb6ec65b95b99d3a2836546063f63acc5171de367e834932a81"
             ],
-            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
-            "version": "==1.16.0"
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2'",
+            "version": "==1.17.0"
         },
         "uritemplate": {
             "hashes": [