diff --git a/Cargo.toml b/Cargo.toml
index aed7719..7218eb3 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -77,4 +77,5 @@ features = [
 default-features = false
 
 [dev-dependencies.warp]
-version = "0.3"
+version = "0.4"
+features = ["server"]
