diff --git a/Dockerfile b/Dockerfile
index 46c347a..652590d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3.15.0b3-alpine
+FROM python:3.15.0b4-alpine
 WORKDIR /usr/src/myapp
 RUN python3 -m pip install jschon
 COPY bowtie_jschon.py .