diff --git a/lib/resty/healthcheck.lua b/lib/resty/healthcheck.lua
index 0782da9..d275c86 100644
--- a/lib/resty/healthcheck.lua
+++ b/lib/resty/healthcheck.lua
@@ -48,7 +48,7 @@ local type = type
 local assert = assert
 
 
-local RESTY_EVENTS_VER = [[^0\.[12]\.\d+$]]
+local RESTY_EVENTS_VER = [[^0\.[123]\.\d+$]]
 local RESTY_WORKER_EVENTS_VER = "0.3.3"