diff --git a/Dockerfile b/Dockerfile
index 1f592b7..823074d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -47,7 +47,7 @@ ARG CONFIG="\
 		--add-module=/usr/src/ngx_brotli \
 	"
 
-FROM registry.odit.services/hub/library/alpine:3.13
+FROM registry.odit.services/hub/library/alpine:3.15
 LABEL maintainer="NGINX Docker Maintainers <docker-maint@nginx.com>"
 
 ARG NGINX_VERSION
@@ -132,7 +132,7 @@ RUN \
 			| xargs -r apk info --installed \
 			| sort -u > /tmp/runDeps.txt
 
-FROM registry.odit.services/hub/library/alpine:3.13
+FROM registry.odit.services/hub/library/alpine:3.15
 ARG NGINX_VERSION
 
 COPY --from=0 /tmp/runDeps.txt /tmp/runDeps.txt