diff --git a/Dockerfile b/Dockerfile
index a7886fb..471467d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3.15.0a8-slim
+FROM python:3.15.0b4-slim
 
 ENV RUNNER="runner"
 ENV WORKDIR="/workdir/"