diff --git a/CHANGES.rst b/CHANGES.rst
index d8d4586f..71215467 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,3 +1,12 @@
+4.2.1 (unreleased)
+==================
+
+Bug fixes
+---------
+
+- Avoid numpy>=2.0 deprecation warnings being raised in the ``__array__()``
+  methods of ``Payload`` and ``Frame.__array__()``. [#525]
+
 4.2 (2024-07-17)
 ================
 
diff --git a/baseband/base/frame.py b/baseband/base/frame.py
index 9caaaa9e..1db5e6d5 100644
--- a/baseband/base/frame.py
+++ b/baseband/base/frame.py
@@ -179,12 +179,12 @@ def fill_value(self):
     def fill_value(self, fill_value):
         self._fill_value = fill_value
 
-    def __array__(self, dtype=None):
+    def __array__(self, dtype=None, copy=None):
         """Interface to arrays."""
-        if dtype is None or dtype == self.dtype:
+        if not copy and (dtype is None or dtype == self.dtype):
             return self.data
         else:
-            return self.data.astype(dtype)
+            return self.data.astype(dtype, copy=True)
 
     # Header behaves as a dictionary, while Payload can be indexed/sliced.
     # Let frame behave appropriately.
diff --git a/baseband/base/payload.py b/baseband/base/payload.py
index 271894dd..8556a039 100644
--- a/baseband/base/payload.py
+++ b/baseband/base/payload.py
@@ -181,12 +181,12 @@ def fromdata(cls, data, header=None, bps=2):
         return cls(words, sample_shape=sample_shape, bps=bps,
                    complex_data=complex_data)
 
-    def __array__(self, dtype=None):
+    def __array__(self, dtype=None, copy=None):
         """Interface to arrays."""
-        if dtype is None or dtype == self.dtype:
+        if not copy and (dtype is None or dtype == self.dtype):
             return self.data
         else:
-            return self.data.astype(dtype)
+            return self.data.astype(dtype, copy=True)
 
     @property
     def nbytes(self):