diff --git a/Dockerfile b/Dockerfile
index b124c73ce..c701cd76c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3.12-bookworm
+FROM python:3.12.6-bookworm
 ENV PYTHONUNBUFFERED=1
 ENV PYTHONDONTWRITEBYTECODE=1
 
diff --git a/Dockerfile.cabotage b/Dockerfile.cabotage
index 854e3179e..9bc9d27ad 100644
--- a/Dockerfile.cabotage
+++ b/Dockerfile.cabotage
@@ -1,4 +1,4 @@
-FROM python:3.12-bookworm
+FROM python:3.12.6-bookworm
 COPY --from=ewdurbin/nginx-static:1.25.x /usr/bin/nginx /usr/bin/nginx
 ENV PYTHONUNBUFFERED=1
 ENV PYTHONDONTWRITEBYTECODE=1
diff --git a/runtime.txt b/runtime.txt
deleted file mode 100644
index c9cbcea6f..000000000
--- a/runtime.txt
+++ /dev/null
@@ -1 +0,0 @@
-python-3.9.16