diff --git a/packages/jsonrpc/src/index.ts b/packages/jsonrpc/src/index.ts
index e98ef36..7b86b52 100644
--- a/packages/jsonrpc/src/index.ts
+++ b/packages/jsonrpc/src/index.ts
@@ -1,3 +1,4 @@
+export * from './ensure'
 export * from './error'
 export * from './express'
 export * from './jsonrpc'