diff --git a/src/bootstrap.php b/src/bootstrap.php
index 15e30b59..95384b71 100644
--- a/src/bootstrap.php
+++ b/src/bootstrap.php
@@ -59,6 +59,6 @@ if (filter_var(getenv('SPC_ENABLE_LOG_FILE'), FILTER_VALIDATE_BOOLEAN)) {
 }
 
 // load core registry
-Registry::loadRegistry(ROOT_DIR . '/spc.registry.json');
+Registry::loadRegistry(ROOT_DIR . '/spc.registry.yml');
 // load registries from environment variable SPC_REGISTRIES
 Registry::loadFromEnvOrOption();