diff --git a/Dockerfile b/Dockerfile
index a70f3732..55dd7fa9 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -210,7 +210,7 @@ RUN echo "deb-src http://nginx.org/packages/mainline/debian/ bullseye nginx" >>
 
 ### Base build image for alpine
 # docker.io/library/nginx is a temporary workaround for Dependabot to see this as different from the one used in Debian
-FROM docker.io/library/nginx:1.21.3-alpine AS build-nginx-alpine
+FROM docker.io/library/nginx:1.21.4-alpine AS build-nginx-alpine
 RUN apk add --no-cache \
     build-base \
     pcre-dev \
@@ -238,7 +238,7 @@ RUN curl -sSL -O https://github.com/nginx/nginx/archive/release-${NGINX_VERSION}
 
 ### Base image for alpine
 # docker.io/library/nginx is a temporary workaround for Dependabot to see this as different from the one used in Debian
-FROM docker.io/library/nginx:1.21.3-alpine as nginx-alpine
+FROM docker.io/library/nginx:1.21.4-alpine as nginx-alpine
 RUN apk add --no-cache libstdc++