diff --git a/src/device.rs b/src/device.rs
index 0f29bfb..781ab02 100644
--- a/src/device.rs
+++ b/src/device.rs
@@ -38,7 +38,7 @@ pub struct Device {
     sub_type: u16,
     device_protocol_version: u8,
 
-    updates: Vec<Box<dyn Fn(&HashMap<&'static str, AttributeValue>) -> Result<()>>>,
+    updates: Vec<Box<dyn Fn(&HashMap<&'static str, AttributeValue>) -> Result<()> + Send + Sync>>,
 
     token: [u8; 64],
     key: [u8; 32],
@@ -153,7 +153,7 @@ impl Device {
 
     pub fn register_update<F>(mut self, f: F) -> Self
     where
-        F: Fn(&HashMap<&'static str, AttributeValue>) -> Result<()> + 'static,
+        F: Fn(&HashMap<&'static str, AttributeValue>) -> Result<()> + Send + Sync + 'static,
     {
         self.updates.push(Box::new(f));