diff --git a/app/Dockerfile b/app/Dockerfile
index f0e3fda..961aeaf 100644
--- a/app/Dockerfile
+++ b/app/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3.14.3-alpine
+FROM python:3.15.0a8-alpine
 
 COPY --from=ghcr.io/astral-sh/uv:0.10.0 /uv /uvx /bin/
 
diff --git a/sandbox/Dockerfile b/sandbox/Dockerfile
index 55c77c2..3ee963c 100644
--- a/sandbox/Dockerfile
+++ b/sandbox/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3.14.3-alpine
+FROM python:3.15.0a8-alpine
 
 COPY --from=ghcr.io/astral-sh/uv:0.10.0 /uv /uvx /bin/