diff --git a/Dockerfile b/Dockerfile
index c57b8cc..c8d1d9d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM composer@sha256:d374b2e1f715621e9d9929575d6b35b11cf4a6dc237d4a08f2e6d1611f534675 as composer
+FROM composer@sha256:706b731de8fe83b64bb542bec1d6f20f95d300e21fbcc6f3f1b7fab39892e90e as composer
 # composer is pinned at a PHP 7 version
 
 WORKDIR /installing