diff --git a/Jenkinsfile b/Jenkinsfile
index 9e0646b..4b465ad 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -24,12 +24,8 @@ node {
  
  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']],
+			userRemoteConfigs: [[url: 'https://git.wmi.amu.edu.pl/s478855/ium_478855.git']]])
        }
     }