diff --git a/docker/Containerfile-ubuntu-2204 b/docker/Containerfile-ubuntu-2204
index 733cb18..be2396f 100644
--- a/docker/Containerfile-ubuntu-2204
+++ b/docker/Containerfile-ubuntu-2204
@@ -1,4 +1,4 @@
-FROM ubuntu:jammy as jags
+FROM ubuntu:jammy AS jags
 
 RUN apt update && apt install -y --no-install-recommends curl make ca-certificates gcc g++ gfortran liblapack-dev
 # These usually are not packaged in OS repositories and need to be installed from source
diff --git a/docker/Containerfile-ubuntu-2404 b/docker/Containerfile-ubuntu-2404
index da91c70..1024d89 100644
--- a/docker/Containerfile-ubuntu-2404
+++ b/docker/Containerfile-ubuntu-2404
@@ -1,4 +1,4 @@
-FROM ubuntu:noble as jags
+FROM ubuntu:noble AS jags
 
 RUN apt update && apt install -y --no-install-recommends curl make ca-certificates gcc g++ gfortran liblapack-dev
 # These usually are not packaged in OS repositories and need to be installed from source