diff --git a/ci/Jenkinsfile b/ci/Jenkinsfile
index fe54eaa..43f7fae 100644
--- a/ci/Jenkinsfile
+++ b/ci/Jenkinsfile
@@ -89,22 +89,17 @@ node("master") {
         sh 'git show'
    }
     stage('(re-)generate image') {
-      try {
-        sh '''#!/bin/bash
-        git worktree add tmpmaster refs/changes/17/18617/8
+       sh '''#!/bin/bash
+        git worktree add tmpmaster origin/master
         cd tmpmaster
-        docker build --target base --tag jenkinsng.admin.frm2:5000/secop_base:latest \
-                     --tag secop_base:latest ci
+        docker build --target base --tag secop_base:latest ci
         cd ..
         rm -rf tmpmaster
         '''
-      } catch (all) {
-      }
    }
 
     stage('execute tests') {
-        img = docker.image('jenkinsng.admin.frm2:5000/secop_base:latest')
-        img.pull()
+        img = docker.image('secop_base:latest')
         img.inside {
             run_tests('python2')
         }
diff --git a/ci/README b/ci/README
index 38a7213..0417805 100644
--- a/ci/README
+++ b/ci/README
@@ -18,6 +18,3 @@ To test images interactivly:
 The Jenkinsfile uses this Dockerfile (only approved checked-in versions from master)
 to build the images (a rebuild will only happen if the Dockerfile is changed as docker
  caches the images and build information) and  run the test suite inside the container.
-
-(Note: The initial version still has some bootstrapping glue, that will get
-changed in a followup).