diff --git a/num_enum/Cargo.toml b/num_enum/Cargo.toml
index c636c9a..99cb25f 100644
--- a/num_enum/Cargo.toml
+++ b/num_enum/Cargo.toml
@@ -30,3 +30,4 @@ maintenance = { status = "passively-maintained" }
 [dependencies]
 derivative = { version = "2", features = ["use_core"] }
 num_enum_derive = { version = "0.4.3", path = "../num_enum_derive", default-features = false }
+serde = { version = "1", default_features = false }