diff --git a/Jenkinsfile.groovy b/Jenkinsfile.groovy
index e799493..02c109f 100644
--- a/Jenkinsfile.groovy
+++ b/Jenkinsfile.groovy
@@ -3,12 +3,16 @@ final String mvn = "mvn --batch-mode --update-snapshots"
 pipeline {
     agent any
     stages {
+        stage('Environment') {
+            steps {
+                sh 'set'
+            }
+        }
         stage('no SNAPSHOT in master') {
-            // checks that the pom version is not a snapshot when the current branch is master
-            // TODO: also check for SNAPSHOT when is a pull request with master as the target branch
+            // checks that the pom version is not a snapshot when the current or target branch is master
             when {
                 expression {
-                    (env.GIT_BRANCH == 'master') &&
+                    (env.GIT_BRANCH == 'master' || env.CHANGE_TARGET == 'master') &&
                             (readMavenPom(file: 'pom.xml').version).contains("SNAPSHOT") }
             }
             steps {
@@ -60,7 +64,7 @@ pipeline {
             }
         }
         stage('Deploy') {
-            when { expression { (env.GIT_BRANCH == 'master') } }
+            when { expression { (env.GIT_BRANCH == 'master' && env.GIT_URL.startsWith('https://')) } }
             steps {
                 withMaven(maven: 'maven 3.5.2', jdk: 'JDK 1.8') {
                     sh "${mvn} deploy --activate-profiles release -DskipTests=true"