diff --git a/1.6/Dockerfile b/1.6/Dockerfile
index 23217fb..6cc3e61 100644
--- a/1.6/Dockerfile
+++ b/1.6/Dockerfile
@@ -7,7 +7,7 @@ ENV GRAV_VERSION 1.6.31
 # renovate: datasource=github-tags depName=krakjoe/apcu versioning=semver
 ENV PHP_APCU_VERSION v5.1.18
 # renovate: datasource=github-tags depName=php/pecl-file_formats-yaml versioning=semver
-ENV PHP_YAML_VERSION 2.1.0
+ENV PHP_YAML_VERSION 2.2.1
 
 RUN set -ex; \
     \
diff --git a/1.7/Dockerfile b/1.7/Dockerfile
index 27956e3..47da9c7 100644
--- a/1.7/Dockerfile
+++ b/1.7/Dockerfile
@@ -7,7 +7,7 @@ ENV GRAV_VERSION 1.7.3
 # renovate: datasource=github-tags depName=krakjoe/apcu versioning=semver
 ENV PHP_APCU_VERSION v5.1.18
 # renovate: datasource=github-tags depName=php/pecl-file_formats-yaml versioning=semver
-ENV PHP_YAML_VERSION 2.1.0
+ENV PHP_YAML_VERSION 2.2.1
 
 RUN set -ex; \
     \