diff --git a/klondike/Cargo.toml b/klondike/Cargo.toml
index 56c2787..ff4927d 100644
--- a/klondike/Cargo.toml
+++ b/klondike/Cargo.toml
@@ -19,4 +19,4 @@ workspace = true
 
 [features]
 default = ["serde"]
-serde = ["dep:serde", "dep:serde_derive"]
+serde = ["dep:serde", "dep:serde_derive", "card_game/serde"]
diff --git a/klondike/src/test.rs b/klondike/src/test.rs
index d7931e1..9550cf2 100644
--- a/klondike/src/test.rs
+++ b/klondike/src/test.rs
@@ -17,6 +17,7 @@ fn test_is_winnable() {
 }
 
 
+#[cfg(feature = "serde")]
 #[test]
 fn test_json() {
 	let mut session = Session::new_default(Klondike::with_seed(124));
@@ -33,6 +34,7 @@ fn test_json() {
 	assert_eq!(serialized, serialized2);
 }
 
+#[cfg(feature = "serde")]
 #[test]
 fn test_rmp() {
 	let mut session = Session::new_default(Klondike::with_seed(124));