diff --git a/Pipfile.lock b/Pipfile.lock
index 2fa1721..c097600 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -25,91 +25,114 @@
         },
         "attrs": {
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+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'",
+            "version": "==21.4.0"
         },
         "numpy": {
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