diff --git a/authn-service/requirements.txt b/authn-service/requirements.txt
index 96f4ca28..55dc9374 100644
--- a/authn-service/requirements.txt
+++ b/authn-service/requirements.txt
@@ -5,7 +5,7 @@ click==7.1.2
 cryptography==2.6.1
 entrypoints==0.3
 Flask==1.1.2
-Flask-Cors==3.0.8
+Flask-Cors==4.0.0
 idna==2.10
 django-two-factor-auth==1.12
 itsdangerous==1.1.0