diff --git a/nginx-regex-tester/regextester/Dockerfile b/nginx-regex-tester/regextester/Dockerfile
index 86348889..ce56e6f8 100644
--- a/nginx-regex-tester/regextester/Dockerfile
+++ b/nginx-regex-tester/regextester/Dockerfile
@@ -5,7 +5,7 @@ RUN chmod +x /usr/local/sbin/start.sh
 
 RUN apt-get update && apt-get install -y -q wget curl apt-transport-https lsb-release ca-certificates gnupg
 
-RUN wget -q -O - http://nginx.org/keys/nginx_signing.key | gpg --dearmor > /usr/share/keyrings/nginx-archive-keyring.gpg
+RUN wget -q -O - https://nginx.org/keys/nginx_signing.key | gpg --dearmor > /usr/share/keyrings/nginx-archive-keyring.gpg
 RUN wget -q -O - https://unit.nginx.org/keys/nginx-keyring.gpg | gpg --dearmor > /usr/share/keyrings/nginx-keyring.gpg
 
 RUN rm /etc/nginx/conf.d/*