diff --git a/requirements.txt b/requirements.txt
index 1e18426..2f8ced0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -10,7 +10,7 @@ jdcal==1.4
 numpy==1.15.3
 openpyxl==2.5.9
 pandas==0.23.4
-pip==18.1
+pip==21.1
 post==1.0.2
 public==2.0.1
 python-dateutil==2.7.5