diff --git a/Dockerfile b/Dockerfile
index 328c55ef8..2e546123c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,6 @@
 FROM ghcr.io/astral-sh/uv:0.11.31@sha256:ecd4de2f060c64bea0ff8ecb182ddf46ba3fcccdc8a60cfdbaf20d1a047d7437 AS uv
 
-FROM python:3.14.6-bookworm
+FROM python:3.15.0b3-bookworm
 ENV PYTHONUNBUFFERED=1
 ENV PYTHONDONTWRITEBYTECODE=1
 
diff --git a/Dockerfile.cabotage b/Dockerfile.cabotage
index a7927af2b..f1e7bab26 100644
--- a/Dockerfile.cabotage
+++ b/Dockerfile.cabotage
@@ -1,6 +1,6 @@
 FROM ghcr.io/astral-sh/uv:0.11.31@sha256:ecd4de2f060c64bea0ff8ecb182ddf46ba3fcccdc8a60cfdbaf20d1a047d7437 AS uv
 
-FROM python:3.14.6-bookworm
+FROM python:3.15.0b3-bookworm
 COPY --from=ewdurbin/nginx-static:1.25.x /usr/bin/nginx /usr/bin/nginx
 ENV PYTHONUNBUFFERED=1
 ENV PYTHONDONTWRITEBYTECODE=1