diff --git a/requirements_dev.txt b/requirements_dev.txt
index eb17b0a..5f7aacd 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -53,7 +53,7 @@ pylint==1.8.4
 pyparsing==2.2.0
 pytest-aiohttp==0.3.0
 pytest==3.5.1
-pytz==2018.4
+pytz==2021.1
 pyyaml==3.12
 requests-toolbelt==0.8.0
 requests==2.19.1