diff --git a/lib/src/graph.rs b/lib/src/graph.rs
index deb60ba8..8124478d 100644
--- a/lib/src/graph.rs
+++ b/lib/src/graph.rs
@@ -92,3 +92,8 @@ impl Graph {
         q.execute(db, self.config.fetch_size, connection).await
     }
 }
+
+const _: () = {
+    const fn assert_send_sync<T: ?Sized + Send + Sync>() {}
+    assert_send_sync::<Graph>();
+};
diff --git a/lib/src/txn.rs b/lib/src/txn.rs
index f980e303..ed1cc1fd 100644
--- a/lib/src/txn.rs
+++ b/lib/src/txn.rs
@@ -79,6 +79,11 @@ impl Txn {
     }
 }
 
+const _: () = {
+    const fn assert_send_sync<T: ?Sized + Send + Sync>() {}
+    assert_send_sync::<Txn>();
+};
+
 pub trait TransactionHandle: private::Handle {}
 
 impl TransactionHandle for Txn {}