CONTAINERS.md in hyrax-4.0.0.beta2 vs CONTAINERS.md in hyrax-4.0.0.rc1

- old
+ new

@@ -189,11 +189,11 @@
 
 We publish several Hyrax images to the [GitHub container registry][ghcr] under
 the [Samvera organization][samvera-packages].  To build them:
 
 ```sh
-export HYRAX_VERSION=v3.4.1 # or desired version
-git checkout $HYRAX_VERSION
+export HYRAX_VERSION=v4.0.0.rc1 # or desired version
+git checkout hyrax-$HYRAX_VERSION
 
 docker build --target hyrax-base --tag ghcr.io/samvera/hyrax/hyrax-base:$(git rev-parse HEAD) .
 
 docker tag ghcr.io/samvera/hyrax/hyrax-base:$(git rev-parse HEAD) ghcr.io/samvera/hyrax/hyrax-base:$HYRAX_VERSION
 
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