diff --git a/Dockerfile b/Dockerfile
index 6bd06c8e..a79fae89 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -45,7 +45,7 @@ RUN \
     echo 'Skip frontend build'; \
   fi
 
-FROM umputun/baseimage:buildgo-v1.14.0 as build-backend
+FROM umputun/baseimage:buildgo-v1.14.0 AS build-backend
 
 ARG CI
 ARG GITHUB_REF
diff --git a/Dockerfile.artifacts b/Dockerfile.artifacts
index 419dca68..2a6ee60d 100644
--- a/Dockerfile.artifacts
+++ b/Dockerfile.artifacts
@@ -19,7 +19,7 @@ WORKDIR /srv/frontend/apps/remark42/
 COPY ./frontend/apps/remark42/ /srv/frontend/apps/remark42/
 RUN pnpm build
 
-FROM umputun/baseimage:buildgo-v1.14.0 as build-backend
+FROM umputun/baseimage:buildgo-v1.14.0 AS build-backend
 
 ARG GITHUB_TOKEN
 ARG GITHUB_REF
diff --git a/backend/_example/memory_store/Dockerfile b/backend/_example/memory_store/Dockerfile
index f4f15cd8..3f1fd996 100644
--- a/backend/_example/memory_store/Dockerfile
+++ b/backend/_example/memory_store/Dockerfile
@@ -1,4 +1,4 @@
-FROM umputun/baseimage:buildgo-v1.14.0 as build-backend
+FROM umputun/baseimage:buildgo-v1.14.0 AS build-backend
 
 ADD backend /build/backend
 WORKDIR /build/backend/_example/memory_store
diff --git a/site/Dockerfile b/site/Dockerfile
index 9dd161ea..ed71aad3 100644
--- a/site/Dockerfile
+++ b/site/Dockerfile
@@ -1,4 +1,4 @@
-FROM node:20-alpine as build
+FROM node:20-alpine AS build
 
 WORKDIR /site
 COPY ./ /site
diff --git a/site/Dockerfile.dev b/site/Dockerfile.dev
index 80e3db41..92174656 100644
--- a/site/Dockerfile.dev
+++ b/site/Dockerfile.dev
@@ -1,4 +1,4 @@
-FROM node:20-alpine as build
+FROM node:20-alpine AS build
 
 WORKDIR /site
 COPY ./ /site