diff --git a/pom.xml b/pom.xml
index 457d741..f7ee5d8 100644
--- a/pom.xml
+++ b/pom.xml
@@ -5,7 +5,7 @@
     <parent>
         <groupId>org.jenkins-ci.plugins</groupId>
         <artifactId>plugin</artifactId>
-        <version>4.54</version>
+        <version>4.64</version>
         <relativePath />
     </parent>
 
diff --git a/src/main/java/hudson/plugins/im/IMPublisher.java b/src/main/java/hudson/plugins/im/IMPublisher.java
index 899eb80..89913a5 100644
--- a/src/main/java/hudson/plugins/im/IMPublisher.java
+++ b/src/main/java/hudson/plugins/im/IMPublisher.java
@@ -629,7 +629,8 @@ private List<AbstractBuild> getUpstreamBuilds(
     //@Bug(6712)
     private boolean downstreamIsFirstInRangeTriggeredByUpstream(
             AbstractBuild<?, ?> upstreamBuild, AbstractBuild<?, ?> downstreamBuild) {
-        RangeSet rangeSet = upstreamBuild.getDownstreamRelationship(downstreamBuild.getProject());
+        AbstractProject<?, ?> downstreamProject = downstreamBuild.getProject();
+        RangeSet rangeSet = upstreamBuild.getDownstreamRelationship(downstreamProject);
 
         if (rangeSet == null || rangeSet.isEmpty()) {
             // should not happen
diff --git a/src/test/java/hudson/plugins/im/IMPublisherTest.java b/src/test/java/hudson/plugins/im/IMPublisherTest.java
index 92afed1..9fed79d 100644
--- a/src/test/java/hudson/plugins/im/IMPublisherTest.java
+++ b/src/test/java/hudson/plugins/im/IMPublisherTest.java
@@ -51,6 +51,7 @@ public class IMPublisherTest {
     private AbstractProject project;
     private AbstractProject upstreamProject;
     private BuildListener listener;
+    private RangeSet rangeset;
 
     @SuppressWarnings("unchecked")
     @Before
@@ -60,19 +61,26 @@ public void before() throws IOException {
         this.imPublisher = new IMTestPublisher();
 
         this.upstreamProject = mock(AbstractProject.class);
+        when(this.upstreamProject.toString()).thenReturn("mock.upstreamProject");
+
         this.project = mock(AbstractProject.class);
+        when(this.project.toString()).thenReturn("mock.project");
         when(project.getScm()).thenReturn(new NullSCM());
 
-        RangeSet rangeset = RangeSet.fromString(buildNumber + "-" + (buildNumber + 2), false);
+        this.rangeset = RangeSet.fromString(buildNumber + "-" + (buildNumber + 2), false);
 
         this.previousBuildUpstreamBuild = mock(AbstractBuild.class);
-        when(this.previousBuildUpstreamBuild.getParent()).thenReturn(project);
+        when(this.previousBuildUpstreamBuild.toString()).thenReturn("mock.previousBuildUpstreamBuild");
+        when(this.previousBuildUpstreamBuild.getProject()).thenReturn(this.project); // Seems required since https://github.com/jenkinsci/instant-messaging-plugin/pull/171 bump
+        when(this.previousBuildUpstreamBuild.getParent()).thenReturn(this.project);  // => should pop out in AbstractBuild.getProject()
 
         this.upstreamBuildBetweenPreviousAndCurrent = mock(AbstractBuild.class);
-        when(this.upstreamBuildBetweenPreviousAndCurrent.getDownstreamRelationship(this.project)).thenReturn(rangeset);
+        when(this.upstreamBuildBetweenPreviousAndCurrent.toString()).thenReturn("mock.upstreamBuildBetweenPreviousAndCurrent");
+        when(this.upstreamBuildBetweenPreviousAndCurrent.getDownstreamRelationship(this.project)).thenReturn(this.rangeset);
 
         this.upstreamBuild = mock(AbstractBuild.class);
-        when(this.upstreamBuild.getDownstreamRelationship(this.project)).thenReturn(rangeset);
+        when(this.upstreamBuild.toString()).thenReturn("mock.upstreamBuild");
+        when(this.upstreamBuild.getDownstreamRelationship(this.project)).thenReturn(this.rangeset);
 
         createPreviousNextRelationShip(this.previousBuildUpstreamBuild, this.upstreamBuildBetweenPreviousAndCurrent,
                 this.upstreamBuild);
@@ -98,16 +106,19 @@ public void before() throws IOException {
 
 
         this.previousBuild = mock(AbstractBuild.class);
+        when(this.previousBuild.toString()).thenReturn("mock.previousBuild");
         when(this.previousBuild.getResult()).thenReturn(Result.SUCCESS);
         when(this.previousBuild.getUpstreamRelationshipBuild(this.upstreamProject)).thenReturn(this.previousBuildUpstreamBuild);
 
         this.build = mock(AbstractBuild.class);
+        when(this.build.toString()).thenReturn("mock.build");
         when(this.build.getResult()).thenReturn(Result.FAILURE);
         when(this.build.getUpstreamRelationshipBuild(this.upstreamProject)).thenReturn(this.upstreamBuild);
         Map<AbstractProject, Integer> upstreamBuilds = Maps.newHashMap();
         upstreamBuilds.put(this.upstreamProject, -1); // number is unimportant, just needed to get the upstream projects
         when(this.build.getUpstreamBuilds()).thenReturn(upstreamBuilds);
-        when(this.build.getParent()).thenReturn(this.project);
+        when(this.build.getProject()).thenReturn(this.project); // Seems required since https://github.com/jenkinsci/instant-messaging-plugin/pull/171 bump
+        when(this.build.getParent()).thenReturn(this.project);  // => should pop out in AbstractBuild.getProject()
         when(this.build.getNumber()).thenReturn(this.buildNumber);
 
         createPreviousNextRelationShip(this.previousBuild, this.build);
diff --git a/src/test/java/hudson/plugins/im/MatrixNotificationTest.java b/src/test/java/hudson/plugins/im/MatrixNotificationTest.java
index 4f7808b..a69d341 100644
--- a/src/test/java/hudson/plugins/im/MatrixNotificationTest.java
+++ b/src/test/java/hudson/plugins/im/MatrixNotificationTest.java
@@ -48,7 +48,8 @@ public void before() throws InterruptedException, IOException {
 
         this.configurationBuild = mock(AbstractBuild.class);
         AbstractProject project = mock(MatrixConfiguration.class);
-        when(configurationBuild.getParent()).thenReturn(project);
+        when(configurationBuild.getProject()).thenReturn(project); // Seems required since https://github.com/jenkinsci/instant-messaging-plugin/pull/171 bump
+        when(configurationBuild.getParent()).thenReturn(project);  // => should pop out in AbstractBuild.getProject()
 
         this.parentBuild = mock(MatrixBuild.class);
     }