diff --git a/Pipfile.lock b/Pipfile.lock
index a6b6ebe..6fb09c7 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -58,11 +58,10 @@
     "develop": {
         "attrs": {
             "hashes": [
-                "sha256:31b2eced602aa8423c2aea9c76a724617ed67cf9513173fd3a4f03e3a929c7e6",
-                "sha256:832aa3cde19744e49938b91fea06d69ecb9e649c93ba974535d08ad92164f700"
+                "sha256:50f3c9b216dc9021042f71b392859a773b904ce1a029077f58f6598272432045",
+                "sha256:8f7335278dedd26b58c38e006338242cc0977f06d51579b2b8b87b9b33bff66c"
             ],
-            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
-            "version": "==20.3.0"
+            "version": "==21.3.0"
         },
         "certifi": {
             "hashes": [