diff --git a/README.md b/README.md
index f8eb56b..bc9c80f 100644
--- a/README.md
+++ b/README.md
@@ -60,7 +60,7 @@ At this point there is one main template - _fpFull.sil_ - but more will follow.
 ## Docker usage
 
 As an alternative method to use FontProof, Docker images are available from [Docker Hub](https://hub.docker.com/repository/docker/siletypesetter/fontproof) or the [GitHub Container Registry](https://github.com/sile-typesetter/fontproof/pkgs/container/fontproof%2Ffontproof) with SILE and the *fontproof* class baked in and ready for use.
-Released versions are tagged to match (e.g. `v1.5.2`), the latest release will be tagged `latest`, and a `master` tag is also available with the freshest development build.
+Released versions are tagged to match (e.g. `v1.5.3`), the latest release will be tagged `latest`, and a `master` tag is also available with the freshest development build.
 In order to be useful you need to tell the Docker run command a way to reach your source documents (and hence also to give it a place to write the output) as well as tell it who you are on the host machine so the output generated inside the container can be created with the expected ownership properties.
 You may find it easiest to run with an alias like this:
 
diff --git a/action.yml b/action.yml
index d4bb10b..1d48817 100644
--- a/action.yml
+++ b/action.yml
@@ -7,7 +7,7 @@ inputs:
     default: ""
 runs:
   using: docker
-  image: docker://ghcr.io/sile-typesetter/fontproof:v1.5.2
+  image: docker://ghcr.io/sile-typesetter/fontproof:v1.5.3
   entrypoint: sh
   args:
     - -c