diff --git a/Dockerfile b/Dockerfile
index 2e8a0ff09e7..95c1d7df845 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3.8-slim AS cirq_base
+FROM python:3.14.0a3-slim AS cirq_base
 
 # Install dependencies.
 # rm -rf /var/lib/apt/lists/* cleans up apt cache. See https://docs.docker.com/develop/develop-images/dockerfile_best-practices/