diff --git a/Dockerfile b/Dockerfile
index f7ac3ca..8cbc09b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,6 @@
 # REF: https://hub.docker.com/_/python
 # Python 3.14.7-slim-trixie
-FROM python:3.14.7-slim-trixie@sha256:ce40764625a4ff50df3548277632e7f96c4e77fe75fa848aae9885476e7df5a4
+FROM python:3.15.0rc2-slim-trixie@sha256:14684656c0069b49e897c63d52bbbe7df8a4bf189911a597403fd3b4ffeaae06
 
 LABEL "com.github.actions.name"="Spellcheck Action"
 LABEL "com.github.actions.description"="Check spelling of files in repository"