diff --git a/src/Dockerfile b/src/Dockerfile
index 90431ac..9471917 100644
--- a/src/Dockerfile
+++ b/src/Dockerfile
@@ -1,4 +1,4 @@
-ARG ALPINE_VERSION
+ARG ALPINE_VERSION=3.21
 FROM alpine:${ALPINE_VERSION}
 ARG GLPI_VERSION