diff --git a/package.yaml b/package.yaml
index a7c02d5..ef69d2b 100644
--- a/package.yaml
+++ b/package.yaml
@@ -3,4 +3,4 @@ name: http
 description: An HTTP server and client.
 environment:
   # Now depends on the new io library.
-  sdk: ^2.0.0-alpha.121
+  sdk: ^2.0.0-alpha.142