diff --git a/pd/src/m_pd.h b/pd/src/m_pd.h
index a9a82a866..28140f669 100644
--- a/pd/src/m_pd.h
+++ b/pd/src/m_pd.h
@@ -14,7 +14,7 @@ extern "C" {
 #define PD_MINOR_VERSION 47
 #define PD_BUGFIX_VERSION 0
 #define PD_TEST_VERSION ""
-#define PD_L2ORK_VERSION "2.2.0"
+#define PD_L2ORK_VERSION "2.2.1"
 #define PDL2ORK
 extern int pd_compatibilitylevel;   /* e.g., 43 for pd 0.43 compatibility */