diff --git a/src/pip/_vendor/vendor.txt b/src/pip/_vendor/vendor.txt
index 90d05a3a001..06fa1358f00 100644
--- a/src/pip/_vendor/vendor.txt
+++ b/src/pip/_vendor/vendor.txt
@@ -12,7 +12,7 @@ pep517==0.8.2
 progress==1.5
 pyparsing==2.4.7
 requests==2.24.0
-    certifi==2020.6.20
+    certifi==2020.06.20
     chardet==3.0.4
     idna==2.10
     urllib3==1.25.9