diff --git a/src/Console/Command/YamlTrait.php b/src/Console/Command/YamlTrait.php
index f84f988..ad5fa99 100644
--- a/src/Console/Command/YamlTrait.php
+++ b/src/Console/Command/YamlTrait.php
@@ -54,6 +54,8 @@ protected function writeYaml(string $yml_file, OutputInterface $output) {
      * Helper to adjust contributions data member before dump.
      */
     protected function prepareContributions() {
+        // Sort projects by identifier.
+        ksort($this->contributions['projects']);
         // Sort people by identifier.
         ksort($this->contributions['people']);
         // Sort contributions by start date.