diff --git a/Cargo.toml b/Cargo.toml
index aeb0432..3ca7a3d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -31,7 +31,7 @@ psl-types = "2.0.11"
 
 # Optional dependencies
 hashbrown = { version = "0.12.3", features = ["inline-more"], optional = true }
-idna = { version = "0.3", optional = true }
+idna = { version = "0.4", optional = true }
 unicase = { version = "2.6.0", default-features = false, optional = true }
 
 [dev-dependencies]