diff --git a/run.sh b/run.sh
index 331517d..7096f5e 100755
--- a/run.sh
+++ b/run.sh
@@ -5,8 +5,22 @@ then
     gh api /repos/$GITHUB_REPOSITORY/releases | jq -e -r '.[] | select(.draft == true and .name == "next") | .body' | egrep "$INTERESTING_CATEGORIES"
 fi
 export MAVEN_OPTS=-Djansi.force=true
-mvn -B -V -s $GITHUB_ACTION_PATH/settings.xml -ntp -Dstyle.color=always -Dset.changelist -DaltDeploymentRepository=maven.jenkins-ci.org::default::https://repo.jenkins-ci.org/releases/ -Pquick-build -P\!consume-incrementals clean deploy
-version=$(mvn -B -ntp -Dset.changelist -Dexpression=project.version -q -DforceStdout help:evaluate)
-gh api -F ref=refs/tags/$version -F sha=$GITHUB_SHA /repos/$GITHUB_REPOSITORY/git/refs
-release=$(gh api /repos/$GITHUB_REPOSITORY/releases | jq -e -r '.[] | select(.draft == true and .name == "next") | .id')
-gh api -X PATCH -F draft=false -F name=$version -F tag_name=$version /repos/$GITHUB_REPOSITORY/releases/$release
+if fgrep -sq changelist.format .mvn/maven.config
+then # JEP-229
+    mvn -B -V -s $GITHUB_ACTION_PATH/settings.xml -ntp -Dstyle.color=always -Dset.changelist -DaltDeploymentRepository=maven.jenkins-ci.org::default::https://repo.jenkins-ci.org/releases/ -Pquick-build -P\!consume-incrementals clean deploy
+    version=$(mvn -B -ntp -Dset.changelist -Dexpression=project.version -q -DforceStdout help:evaluate)
+    gh api -F ref=refs/tags/$version -F sha=$GITHUB_SHA /repos/$GITHUB_REPOSITORY/git/refs
+    name=next
+    tag=$version
+else # MRP
+    git config --global user.email cd@jenkins.io
+    git config --global user.name jenkins-maven-cd-action
+    git config --global url.https://github.com/.insteadOf git@github.com:
+    mvn -B -V -s $GITHUB_ACTION_PATH/settings.xml -ntp -Dstyle.color=always -P\!consume-incrementals -Darguments='-Pquick-build -ntp' validate release:prepare release:perform
+    git checkout HEAD^ # tagged version, rather than prepare for next development version
+    version=$(mvn -B -ntp -Dexpression=project.version -q -DforceStdout help:evaluate)
+    name=$version # TODO why does this work differently than in JEP-229?
+    tag=$(git describe HEAD) # typically ${project.artifactId}-${version}
+fi
+release=$(gh api /repos/$GITHUB_REPOSITORY/releases | jq -e -r --arg name $name '.[] | select(.draft == true and .name == $name) | .id')
+gh api -X PATCH -F draft=false -F name=$version -F tag_name=$tag /repos/$GITHUB_REPOSITORY/releases/$release