chore: bump the version to 2.2.1
diff --git a/src/include/pegasus/version.h b/src/include/pegasus/version.h
index 06809cb..9b042a2 100644
--- a/src/include/pegasus/version.h
+++ b/src/include/pegasus/version.h
@@ -18,4 +18,4 @@
  */
 
 #pragma once
-#define PEGASUS_VERSION "2.2.0"
+#define PEGASUS_VERSION "2.2.1"