diff --git a/egui_demo_lib/Cargo.toml b/egui_demo_lib/Cargo.toml
index 9cf8b17b..d6382b6c 100644
--- a/egui_demo_lib/Cargo.toml
+++ b/egui_demo_lib/Cargo.toml
@@ -16,7 +16,7 @@ include = [ "**/*.rs", "Cargo.toml"]
 
 [dependencies]
 egui = { version = "0.6.0", path = "../egui" }
-epi = { version = "0.6.0", path = "../epi" }
+epi = { version = "0.6.0", path = "../epi", features = ["serde", "serde_json"] }
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"