diff --git a/Dockerfile b/Dockerfile
index 65a69c2..0e0856b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM docker.io/library/alpine:v3:23 AS cabuilder
+FROM docker.io/library/alpine:v3.23 AS cabuilder
 RUN apk add --no-cache ca-certificates py3 py3-requests
 ADD bin/fetch_letsencrypt_ca_certs.py /usr/local/bin/fetch_letsencrypt_ca_certs.py
 RUN /usr/local/bin/fetch_letsencrypt_ca_certs.py /usr/local/share/ca-certificates/