diff --git a/package.json b/package.json
index 076fe37322..81dab350c0 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "opentelemetry-base",
-  "version": "0.4.0",
+  "version": "0.5.1",
   "description": "OpenTelemetry is a distributed tracing and stats collection framework.",
   "main": "build/src/index.js",
   "types": "build/src/index.d.ts",