diff --git a/.github/workflows/integration.yml b/.github/workflows/integration.yml
index 0c669728022..3a66191b531 100644
--- a/.github/workflows/integration.yml
+++ b/.github/workflows/integration.yml
@@ -33,6 +33,7 @@ jobs:
         # Set environment variables
         echo -n "-e CI_PROJECT_DIR=/repo " >> run_in_container
         echo -n "-e CI_COMMIT_REF_NAME=$GITHUB_REF " >> run_in_container
+        echo -n "-e CI_MERGE_REQUEST_TARGET_BRANCH_NAME=$GITHUB_BASE_REF " >> run_in_container
         echo -n "-e CI_REGISTRY_IMAGE=gitlab-registry.cern.ch/cburr/dirac " >> run_in_container
         echo -n "-e MYSQL_VER=${{ matrix.MYSQL_VER }} " >> run_in_container
         echo -n "-e ES_VER=${{ matrix.ES_VER }} " >> run_in_container
diff --git a/tests/CI/run_docker_setup.sh b/tests/CI/run_docker_setup.sh
index e002e20497f..0570b8419e1 100755
--- a/tests/CI/run_docker_setup.sh
+++ b/tests/CI/run_docker_setup.sh
@@ -43,25 +43,44 @@ function prepareEnvironment() {
   # GitLab variables
   cp ./CONFIG "${SERVERCONFIG}"
   if [[ -n $CI_PROJECT_DIR ]]; then
-      echo "I guess we're in GitLab CI, using local repository in branch ${CI_COMMIT_REF_NAME}"
+      echo "I guess we're in GitLab CI/CD or GitHub Actions, using local repository in branch ${CI_COMMIT_REF_NAME}"
+      echo "if this is a merge request, the target is ${CI_MERGE_REQUEST_TARGET_BRANCH_NAME}"
       export TESTREPO=$CI_PROJECT_DIR
       export ALTERNATIVE_MODULES=$CI_PROJECT_DIR
 
-      # find the latest version
+      # find the latest version, unless it's integration
       if [ "${CI_COMMIT_REF_NAME}" = 'refs/heads/integration' ]; then
-          export DIRACBRANCH=integration
+          export DIRAC_RELEASE=integration
+
+          {
+            echo "export TESTREPO=${TESTREPO}"
+            echo "export ALTERNATIVE_MODULES=${ALTERNATIVE_MODULES}"
+            echo "export DIRAC_RELEASE=${DIRAC_RELEASE}"
+          } >> "${SERVERCONFIG}"
+
+      elif [ "${CI_MERGE_REQUEST_TARGET_BRANCH_NAME}" = 'integration' ]; then
+          export DIRAC_RELEASE=integration
+
+          {
+            echo "export TESTREPO=${TESTREPO}"
+            echo "export ALTERNATIVE_MODULES=${ALTERNATIVE_MODULES}"
+            echo "export DIRAC_RELEASE=${DIRAC_RELEASE}"
+          } >> "${SERVERCONFIG}"
+
       else
           majorVersion=$(grep "majorVersion =" "${TESTREPO}/__init__.py" | cut -d "=" -f 2)
           minorVersion=$(grep "minorVersion =" "${TESTREPO}/__init__.py" | cut -d "=" -f 2)
           export DIRACBRANCH=v${majorVersion// }r${minorVersion// }
           echo "Deduced DIRACBRANCH ${DIRACBRANCH} from __init__.py"
+
+          {
+            echo "export TESTREPO=${TESTREPO}"
+            echo "export ALTERNATIVE_MODULES=${ALTERNATIVE_MODULES}"
+            echo "export DIRACBRANCH=${DIRACBRANCH}"
+          } >> "${SERVERCONFIG}"
+
       fi
 
-      {
-        echo "export TESTREPO=${TESTREPO}"
-        echo "export ALTERNATIVE_MODULES=${ALTERNATIVE_MODULES}"
-        echo "export DIRACBRANCH=${DIRACBRANCH}"
-      } >> "${SERVERCONFIG}"
   fi
   cp "${SERVERCONFIG}" "${CLIENTCONFIG}"
 
diff --git a/tests/Jenkins/utilities.sh b/tests/Jenkins/utilities.sh
index b7ca4e75085..c7d937d4609 100644
--- a/tests/Jenkins/utilities.sh
+++ b/tests/Jenkins/utilities.sh
@@ -316,12 +316,16 @@ function installDIRAC(){
   if [ "$CLIENT_ALTERNATIVE_MODULES" ]; then
     echo "Installing from non-release code"
     if [[ -d "$CLIENT_ALTERNATIVE_MODULES" ]]; then
-      INSTALLOPTIONS+="--module=$CLIENT_ALTERNATIVE_MODULES:::DIRAC:::local"
+      INSTALLOPTIONS+=" --module=$CLIENT_ALTERNATIVE_MODULES:::DIRAC:::local"
     else
-      INSTALLOPTIONS+="--module=$CLIENT_ALTERNATIVE_MODULES"
+      INSTALLOPTIONS+=" --module=$CLIENT_ALTERNATIVE_MODULES"
     fi
   fi
 
+  if [ "$DIRACOSVER" ]; then
+    INSTALLOPTIONS+=" --dirac-os --dirac-os-version=$DIRACOSVER "
+  fi
+
   if ! ./dirac-install -r $DIRAC_RELEASE -t client $INSTALLOPTIONS $DEBUG; then
     echo 'ERROR: DIRAC client installation failed'
     exit 1