diff --git a/README.md b/README.md
index 535ff5e..36a97b3 100644
--- a/README.md
+++ b/README.md
@@ -40,7 +40,7 @@ git tag --list | tail -1
 Update WIKI_VERSIONS.txt
 
 ``` bash
-docker run --rm dobbs/farm:1.0.21 wiki --version > WIKI_VERSIONS.txt
+docker run --rm $IMAGE wiki --version > WIKI_VERSIONS.txt
 ```
 
 # Publish container images