diff --git a/seahub/Dockerfile b/seahub/Dockerfile
index ac23148..8a37665 100644
--- a/seahub/Dockerfile
+++ b/seahub/Dockerfile
@@ -38,7 +38,7 @@ pyjwt==2.8.0 \
 mysqlclient==2.2.4 \
 django==3.2.24 \
 django-pylibmc==0.6.1 \
-django-simple-captcha==0.6.0 \
+django-simple-captcha==0.5.20 \
 pycryptodome==3.20.0 \
 djangosaml2==1.9.2 \
 python-ldap==3.4.4 \