diff --git a/jenkins/Jenkinsfile-blossom.premerge b/jenkins/Jenkinsfile-blossom.premerge
index 392e5717142..8d287192c5d 100644
--- a/jenkins/Jenkinsfile-blossom.premerge
+++ b/jenkins/Jenkinsfile-blossom.premerge
@@ -165,22 +165,23 @@ pipeline {
 
             steps {
                 script {
-                    // Retrieve PROJECT_VER from version-def.sh, e.g, '<major>.<minor>.<patch>-SNAPSHOT'
-                    PROJECT_VER = sh(returnStdout: true, script: "bash $JENKINS_ROOT/version-def.sh | cut -d ',' -f 3 | cut -d ' ' -f 3")
-                    PROJECT_VER = PROJECT_VER.split('-')[0] // Remove trailing '-SNAPSHOT'
-                    echo PROJECT_VER
-
-                    def versions = PROJECT_VER.split('\\.')
-                    major_ver = versions[0].toInteger()
-                    minor_ver = versions[1].toInteger()
+                    container('cpu') {
+                        // Retrieve PROJECT_VER from version-def.sh, e.g, '<major>.<minor>.<patch>-SNAPSHOT'
+                        PROJECT_VER = sh(returnStdout: true,
+                                        script: '''#!/bin/bash
+                                                source jenkins/version-def.sh >& /dev/null
+                                                echo $PROJECT_VER
+                                                ''').trim()
+                        PROJECT_VER = PROJECT_VER.split('-')[0] // Remove trailing '-SNAPSHOT'
+                        echo PROJECT_VER
+
+                        def versions = PROJECT_VER.split('\\.')
+                        major_ver = versions[0].toInteger()
+                        minor_ver = versions[1].toInteger()
 
-                    if (major_ver >= 22) {
                         PREMERGE_CI_2_ARGUMENT = "ci_2"
-                    } else {
-                        error("Unsupported major version: $major_ver")
+                        echo PREMERGE_CI_2_ARGUMENT
                     }
-
-                    echo PREMERGE_CI_2_ARGUMENT
                 }
             }
         }