diff --git a/Cargo.toml b/Cargo.toml
index 59141d6..568ac5b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -12,10 +12,11 @@ edition = "2021"
 [dependencies]
 log = "0.4.14"
 once_cell = "1.9.0"
-atomic = "0.5.1"
 cgmath = "0.18.0"
 libc = "0.2.69"
 
+atomic = "0.6.0"
+bytemuck = { version = "1.13.1", features = ["derive"] }
 
 # framebuffer
 memmap2 = { version = "0.5.2", optional = true }
diff --git a/examples/demo.rs b/examples/demo.rs
index f9c3b82..7c83558 100644
--- a/examples/demo.rs
+++ b/examples/demo.rs
@@ -28,7 +28,10 @@ use std::sync::Mutex;
 use std::thread::sleep;
 use std::time::Duration;
 
-#[derive(Copy, Clone, PartialEq)]
+use bytemuck::NoUninit;
+
+#[derive(Copy, Clone, PartialEq, NoUninit)]
+#[repr(i64)]
 enum DrawMode {
     Draw(u32),
     Erase(u32),