diff --git a/Jenkinsfile b/Jenkinsfile
index d18875a..d437f65 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -29,12 +29,7 @@ pipeline {
     stages {
         stage('Checkout') {
       steps {
-        script {
-           git credentialsId: 'jenkins-user-github', url: 'https://git.wmi.amu.edu.pl/s478855/ium_478855.git'
-           sh "ls -lart ./*" 
-           sh "git branch -a"
-           sh "git checkout master"
-          }
+        checkout([$class: 'GitSCM', branches: [[name: '*/master']], extensions: [], userRemoteConfigs: [[credentialsId: 's478855', url: 'https://git.wmi.amu.edu.pl/s478855/ium_478855.git']]])
        }
     }
         stage("Preparation") {