diff --git a/Dockerfile b/Dockerfile
index c57b8cc..1e3b933 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM composer@sha256:d374b2e1f715621e9d9929575d6b35b11cf4a6dc237d4a08f2e6d1611f534675 as composer
+FROM composer@sha256:3e409c6df20d7d8b644f72467d54f203efd6b2695c6345d363abd1ca9a80c4c2 as composer
 # composer is pinned at a PHP 7 version
 
 WORKDIR /installing