diff --git a/compose/local/django/Dockerfile b/compose/local/django/Dockerfile
index 295a186..aaba2ef 100644
--- a/compose/local/django/Dockerfile
+++ b/compose/local/django/Dockerfile
@@ -1,4 +1,6 @@
-FROM python:${PYTHON_IMAGE_VER:-3.12}-slim-bookworm
+ARG PYTHON_IMAGE_VER=3.12
+
+FROM python:${PYTHON_IMAGE_VER}-slim-bookworm
 
 ENV PIP_ROOT_USER_ACTION ignore
 ENV PYTHONUNBUFFERED 1
diff --git a/compose/local/docs/Dockerfile b/compose/local/docs/Dockerfile
index 15dd903..49965c7 100644
--- a/compose/local/docs/Dockerfile
+++ b/compose/local/docs/Dockerfile
@@ -1,4 +1,6 @@
-FROM python:${PYTHON_IMAGE_VER:-3.12}-slim-bookworm
+ARG PYTHON_IMAGE_VER=3.12
+
+FROM python:${PYTHON_IMAGE_VER}-slim-bookworm
 
 ENV PIP_ROOT_USER_ACTION ignore
 ENV PYTHONUNBUFFERED 1
diff --git a/compose/production/django/Dockerfile b/compose/production/django/Dockerfile
index 2a4680d..8474812 100644
--- a/compose/production/django/Dockerfile
+++ b/compose/production/django/Dockerfile
@@ -1,4 +1,6 @@
-FROM python:${PYTHON_IMAGE_VER:-3.12}-slim-bookworm
+ARG PYTHON_IMAGE_VER=3.12
+
+FROM python:${PYTHON_IMAGE_VER}-slim-bookworm
 
 ENV PYTHONUNBUFFERED 1
 
diff --git a/compose/production/postgres/Dockerfile b/compose/production/postgres/Dockerfile
index d5a6ed3..88f86a9 100644
--- a/compose/production/postgres/Dockerfile
+++ b/compose/production/postgres/Dockerfile
@@ -1,4 +1,6 @@
-FROM postgres:${POSTGRES_IMAGE_VER:-12.3}
+ARG POSTGRES_IMAGE_VER=12.3
+
+FROM postgres:${POSTGRES_IMAGE_VER}
 
 COPY ./compose/production/postgres/maintenance /usr/local/bin/maintenance
 RUN chmod +x /usr/local/bin/maintenance/*