diff --git a/2.2/Dockerfile b/2.2/Dockerfile
index 4bdbebe..24c2561 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 2.2.21
+ENV COMPOSER_VERSION 2.2.22
 
 RUN set -eux ; \
   # install https://github.com/mlocati/docker-php-extension-installer