diff --git a/2.2/Dockerfile b/2.2/Dockerfile
index 1a232b4..5a787c7 100644
--- a/2.2/Dockerfile
+++ b/2.2/Dockerfile
@@ -22,7 +22,7 @@ memory_limit=-1\n\
 
 ENV COMPOSER_ALLOW_SUPERUSER=1
 ENV COMPOSER_HOME=/tmp
-ENV COMPOSER_VERSION=2.2.28
+ENV COMPOSER_VERSION=2.2.29
 
 RUN set -eux ; \
   # install https://github.com/mlocati/docker-php-extension-installer