diff --git a/Dockerfile b/Dockerfile
index b506132..e268b92 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -12,7 +12,7 @@ RUN bundle install
 COPY . .
 
 ENV RACK_ENV=production
-ENV SESSION_SECRET=todoizer_secret_key_change_me_in_prod
+ENV SESSION_SECRET=todoizer_secret_key_change_me_in_prod_make_it_at_least_64_characters_long_for_rack_3_security
 
 RUN chmod +x entrypoint.sh