diff --git a/README.md b/README.md
index 118561b..cdf27d5 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,7 @@ Add the dependency to your `Cargo.toml`:
 
 ```toml
 [dependencies]
-tower-batch = "0.3.0"
+tower-batch = "0.4.0"
 ```
 
 Create a batch service and start sending requests: