diff --git a/src/main/java/me/champeau/gradle/japicmp/JApiCmpWorkerAction.java b/src/main/java/me/champeau/gradle/japicmp/JApiCmpWorkerAction.java
index 33b0ecf..9d700b5 100644
--- a/src/main/java/me/champeau/gradle/japicmp/JApiCmpWorkerAction.java
+++ b/src/main/java/me/champeau/gradle/japicmp/JApiCmpWorkerAction.java
@@ -74,6 +74,7 @@
 import java.util.Comparator;
 import java.util.List;
 import java.util.Map;
+import java.util.Objects;
 import java.util.stream.Collectors;
 
 public class JApiCmpWorkerAction extends JapiCmpWorkerConfiguration implements Runnable {
@@ -410,5 +411,18 @@ public String toString() {
         public JApiCmpArchive toJapicmpArchive() {
             return new JApiCmpArchive(file, version);
         }
+
+        @Override
+        public boolean equals(Object obj) {
+            if (this == obj) {
+                return true;
+            }
+            return obj instanceof Archive && hashCode() == obj.hashCode();
+        }
+
+        @Override
+        public int hashCode() {
+            return Objects.hash(file.getName(), version);
+        }
     }
 }
diff --git a/src/main/java/me/champeau/gradle/japicmp/JapicmpTask.java b/src/main/java/me/champeau/gradle/japicmp/JapicmpTask.java
index dc7fe50..5810ea5 100644
--- a/src/main/java/me/champeau/gradle/japicmp/JapicmpTask.java
+++ b/src/main/java/me/champeau/gradle/japicmp/JapicmpTask.java
@@ -35,8 +35,10 @@
 import java.security.CodeSource;
 import java.security.ProtectionDomain;
 import java.util.ArrayList;
+import java.util.Collection;
 import java.util.Collections;
 import java.util.HashSet;
+import java.util.LinkedHashSet;
 import java.util.List;
 import java.util.Set;
 
@@ -225,15 +227,12 @@ private static List<JApiCmpWorkerAction.Archive> toArchives(FileCollection fc) {
         return archives;
     }
 
-    private void collectArchives(final List<JApiCmpWorkerAction.Archive> archives, ResolvedDependency resolvedDependency) {
-        String version = resolvedDependency.getModule().getId().getVersion();
+    private void collectArchives(final Collection<JApiCmpWorkerAction.Archive> archives, ResolvedDependency resolvedDependency) {
         Set<ResolvedArtifact> allModuleArtifacts = resolvedDependency.getAllModuleArtifacts();
         for (ResolvedArtifact resolvedArtifact : allModuleArtifacts) {
+            String version = resolvedArtifact.getModuleVersion().getId().getVersion();
             archives.add(new JApiCmpWorkerAction.Archive(resolvedArtifact.getFile(), version));
         }
-        for (ResolvedDependency dependency : resolvedDependency.getChildren()) {
-            collectArchives(archives, dependency);
-        }
     }
 
     public void richReport(Action<? super RichReport> configureAction) {
@@ -308,7 +307,7 @@ public void addExcludeFilter(Class<? extends Filter> excludeFilterClass) {
     public abstract ListProperty<JApiCmpWorkerAction.Archive> getOldArchiveList();
 
     public void addOldArchives(Configuration config) {
-        List<JApiCmpWorkerAction.Archive> oldArchives = new ArrayList<>();
+        Set<JApiCmpWorkerAction.Archive> oldArchives = new LinkedHashSet<>();
         for (ResolvedDependency resolvedDependency : config.getResolvedConfiguration().getFirstLevelModuleDependencies()) {
             collectArchives(oldArchives, resolvedDependency);
         }
@@ -320,7 +319,7 @@ public void addOldArchives(Configuration config) {
     public abstract ListProperty<JApiCmpWorkerAction.Archive> getNewArchiveList();
 
     public void addNewArchives(Configuration config) {
-        List<JApiCmpWorkerAction.Archive> newArchives = new ArrayList<>();
+        Set<JApiCmpWorkerAction.Archive> newArchives = new LinkedHashSet<>();
         for (ResolvedDependency resolvedDependency : config.getResolvedConfiguration().getFirstLevelModuleDependencies()) {
             collectArchives(newArchives, resolvedDependency);
         }
diff --git a/src/test/groovy/me/champeau/gradle/ReportsFunctionalTest.groovy b/src/test/groovy/me/champeau/gradle/ReportsFunctionalTest.groovy
index 6984d57..4930893 100644
--- a/src/test/groovy/me/champeau/gradle/ReportsFunctionalTest.groovy
+++ b/src/test/groovy/me/champeau/gradle/ReportsFunctionalTest.groovy
@@ -81,6 +81,30 @@ class ReportsFunctionalTest extends BaseFunctionalTest {
         result.task(":japicmpXmlWithVersions").outcome == TaskOutcome.UP_TO_DATE
     }
 
+    def "can generate an XML report with no duplicate transitive versions"() {
+        when:
+        def result = run 'japicmpXmlWithTransitiveVersions'
+
+        then:
+        result.task(":japicmpXmlWithTransitiveVersions").outcome == TaskOutcome.SUCCESS
+        hasXmlReport('oldJar="assertj-guava-3.25.3.jar;assertj-core-3.25.3.jar;byte-buddy-1.14.11.jar;assertj-joda-time-2.2.0.jar"')
+        hasXmlReport('newJar="assertj-guava-3.26.3.jar;assertj-core-3.26.3.jar;byte-buddy-1.14.18.jar;assertj-joda-time-2.1.0.jar"')
+        hasXmlReport('oldVersion="3.25.3;3.25.3;1.14.11;2.2.0"')
+        hasXmlReport('newVersion="3.26.3;3.26.3;1.14.18;2.1.0"')
+
+        noTxtReport()
+        noMarkdownReport()
+        noSemverReport()
+        noHtmlReport()
+        noRichReport()
+
+        when:
+        result = run 'japicmpXmlWithTransitiveVersions'
+
+        then:
+        result.task(":japicmpXmlWithTransitiveVersions").outcome == TaskOutcome.UP_TO_DATE
+    }
+
     def "can generate rich report"() {
         when:
         def result = run 'japicmpRich'
diff --git a/src/test/test-projects/html-report/build.gradle b/src/test/test-projects/html-report/build.gradle
index 889426e..6f2b92e 100644
--- a/src/test/test-projects/html-report/build.gradle
+++ b/src/test/test-projects/html-report/build.gradle
@@ -9,11 +9,18 @@ repositories {
 configurations {
     baseline
     current
+    baseline2
+    current2
 }
 
 dependencies {
     baseline 'org.apache.commons:commons-lang3:3.5'
     current 'org.apache.commons:commons-lang3:3.6'
+
+    baseline2 'org.assertj:assertj-guava:3.25.3'
+    baseline2 'org.assertj:assertj-joda-time:2.2.0'
+    current2 'org.assertj:assertj-guava:3.26.3'
+    current2 'org.assertj:assertj-joda-time:2.1.0'
 }
 
 task japicmp(type: me.champeau.gradle.japicmp.JapicmpTask) {
@@ -61,3 +68,10 @@ task japicmpXmlWithVersions(type: me.champeau.gradle.japicmp.JapicmpTask) {
     addNewArchives(configurations.current)
     xmlOutputFile = layout.buildDirectory.file('reports/japi.xml').get().asFile
 }
+
+task japicmpXmlWithTransitiveVersions(type: me.champeau.gradle.japicmp.JapicmpTask) {
+    addOldArchives(configurations.baseline2)
+    addNewArchives(configurations.current2)
+    ignoreMissingClasses = true
+    xmlOutputFile = layout.buildDirectory.file('reports/japi.xml').get().asFile
+}