diff --git a/Dockerfiles/nginx.Dockerfile b/Dockerfiles/nginx.Dockerfile
index 83d885ad5..425e3fcbb 100644
--- a/Dockerfiles/nginx.Dockerfile
+++ b/Dockerfiles/nginx.Dockerfile
@@ -33,7 +33,7 @@ RUN find /site -type f -name "*.md" -exec sed -i "s/{{[[:space:]]*site.github.bu
     find /site/_site -type f -name "*.html" -exec sed -i 's@\(href=\)"/"@\1"/readme/"@g' "{}" \;
 
 # build NGINX image
-FROM alpine:3.19
+FROM alpine:3.18
 
 LABEL maintainer="malcolm@inl.gov"
 LABEL org.opencontainers.image.authors='malcolm@inl.gov'