diff --git a/infra/dockerfile.base b/infra/dockerfile.base
index d7827ed9e5..0da15d86e2 100644
--- a/infra/dockerfile.base
+++ b/infra/dockerfile.base
@@ -1,4 +1,4 @@
-FROM python:3.14.3-slim
+FROM python:3.15.0a8-slim
 
 COPY --from=ghcr.io/astral-sh/uv:latest /uv /uvx /bin/
 
diff --git a/infra/dockerfile.spawn_pipeline b/infra/dockerfile.spawn_pipeline
index f011c7d583..835b64af11 100644
--- a/infra/dockerfile.spawn_pipeline
+++ b/infra/dockerfile.spawn_pipeline
@@ -1,4 +1,4 @@
-FROM python:3.14.3-slim
+FROM python:3.15.0a8-slim
 
 COPY --from=ghcr.io/astral-sh/uv:latest /uv /uvx /bin/