diff --git a/Sources/Atomics/AtomicLazyReference.swift.gyb b/Sources/Atomics/AtomicLazyReference.swift.gyb
index f7b448e..61d03c3 100644
--- a/Sources/Atomics/AtomicLazyReference.swift.gyb
+++ b/Sources/Atomics/AtomicLazyReference.swift.gyb
@@ -47,6 +47,11 @@ public struct UnsafeAtomicLazyReference<Instance: AnyObject> {
   }
 }
 
+#if compiler(>=5.5) && canImport(_Concurrency)
+extension UnsafeAtomicLazyReference: @unchecked Sendable
+where Instance: Sendable {}
+#endif
+
 extension UnsafeAtomicLazyReference {
   /// The storage representation for an atomic lazy reference value.
   @frozen
diff --git a/Sources/Atomics/HighLevelTypes.swift.gyb b/Sources/Atomics/HighLevelTypes.swift.gyb
index b986f34..799a57e 100644
--- a/Sources/Atomics/HighLevelTypes.swift.gyb
+++ b/Sources/Atomics/HighLevelTypes.swift.gyb
@@ -71,6 +71,10 @@ public struct UnsafeAtomic<Value: AtomicValue> {
   }
 }
 
+#if compiler(>=5.5) && canImport(_Concurrency)
+extension UnsafeAtomic: @unchecked Sendable where Value: Sendable {}
+#endif
+
 /// A reference type holding an atomic value, with automatic memory management.
 @_fixed_layout
 public class ManagedAtomic<Value: AtomicValue> {
diff --git a/Sources/Atomics/autogenerated/AtomicLazyReference.swift b/Sources/Atomics/autogenerated/AtomicLazyReference.swift
index 1184a7e..fdef07d 100644
--- a/Sources/Atomics/autogenerated/AtomicLazyReference.swift
+++ b/Sources/Atomics/autogenerated/AtomicLazyReference.swift
@@ -50,6 +50,11 @@ public struct UnsafeAtomicLazyReference<Instance: AnyObject> {
   }
 }
 
+#if compiler(>=5.5) && canImport(_Concurrency)
+extension UnsafeAtomicLazyReference: @unchecked Sendable
+where Instance: Sendable {}
+#endif
+
 extension UnsafeAtomicLazyReference {
   /// The storage representation for an atomic lazy reference value.
   @frozen
diff --git a/Sources/Atomics/autogenerated/HighLevelTypes.swift b/Sources/Atomics/autogenerated/HighLevelTypes.swift
index 6551cae..3b67afc 100644
--- a/Sources/Atomics/autogenerated/HighLevelTypes.swift
+++ b/Sources/Atomics/autogenerated/HighLevelTypes.swift
@@ -73,6 +73,10 @@ public struct UnsafeAtomic<Value: AtomicValue> {
   }
 }
 
+#if compiler(>=5.5) && canImport(_Concurrency)
+extension UnsafeAtomic: @unchecked Sendable where Value: Sendable {}
+#endif
+
 /// A reference type holding an atomic value, with automatic memory management.
 @_fixed_layout
 public class ManagedAtomic<Value: AtomicValue> {