diff --git a/Cargo.toml b/Cargo.toml
index de75a41..2731d4d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,7 +16,7 @@ default = ["console_error_panic_hook"]
 
 [dependencies]
 cfg-if = "1.0.0"
-worker = "0.3.2"
+worker = "0.4.0"
 serde_json = "1.0"
 wasm-timer = "0.2.5"