diff --git a/TravisCi/ComposerManifestUpdater.php b/TravisCi/ComposerManifestUpdater.php
index 5b223bb..1d94f54 100644
--- a/TravisCi/ComposerManifestUpdater.php
+++ b/TravisCi/ComposerManifestUpdater.php
@@ -41,6 +41,12 @@
     exit(1);
 }
 
+// Merge dev requirements from dev-collection
+$buildComposerManifest = json_decode(file_get_contents('../../' . $travisRepoSlug . '/composer.json'), true);
+if (isset($buildComposerManifest['require-dev'])) {
+    $composerManifest['require-dev'] = array_merge($composerManifest['require-dev'], $buildComposerManifest['require-dev']);
+}
+
 $output = json_encode($composerManifest, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES) . PHP_EOL;
 print_r($output);
 file_put_contents('composer.json', $output);