diff --git a/bigframes/dataframe.py b/bigframes/dataframe.py
index c02b182ee3..d3d89c6a19 100644
--- a/bigframes/dataframe.py
+++ b/bigframes/dataframe.py
@@ -3705,7 +3705,9 @@ def to_numpy(
     ) -> numpy.ndarray:
         return self.to_pandas().to_numpy(dtype, copy, na_value, **kwargs)
 
-    def __array__(self, dtype=None) -> numpy.ndarray:
+    def __array__(self, dtype=None, copy: Optional[bool] = None) -> numpy.ndarray:
+        if copy is False:
+            raise ValueError("Cannot convert to array without copy.")
         return self.to_numpy(dtype=dtype)
 
     __array__.__doc__ = inspect.getdoc(vendored_pandas_frame.DataFrame.__array__)
diff --git a/bigframes/series.py b/bigframes/series.py
index fe2d1aae0e..a903f9823f 100644
--- a/bigframes/series.py
+++ b/bigframes/series.py
@@ -1812,7 +1812,9 @@ def to_numpy(
     ) -> numpy.ndarray:
         return self.to_pandas().to_numpy(dtype, copy, na_value, **kwargs)
 
-    def __array__(self, dtype=None) -> numpy.ndarray:
+    def __array__(self, dtype=None, copy: Optional[bool] = None) -> numpy.ndarray:
+        if copy is False:
+            raise ValueError("Cannot convert to array without copy.")
         return self.to_numpy(dtype=dtype)
 
     __array__.__doc__ = inspect.getdoc(vendored_pandas_series.Series.__array__)
diff --git a/third_party/bigframes_vendored/pandas/core/frame.py b/third_party/bigframes_vendored/pandas/core/frame.py
index f5aa23d00b..e296dcb9f6 100644
--- a/third_party/bigframes_vendored/pandas/core/frame.py
+++ b/third_party/bigframes_vendored/pandas/core/frame.py
@@ -7179,7 +7179,7 @@ def __len__(self):
         """
         raise NotImplementedError(constants.ABSTRACT_METHOD_ERROR_MESSAGE)
 
-    def __array__(self):
+    def __array__(self, dtype=None, copy: Optional[bool] = None):
         """
         Returns the rows as NumPy array.
 
@@ -7210,6 +7210,8 @@ def __array__(self):
             dtype (str or numpy.dtype, optional):
                 The dtype to use for the resulting NumPy array. By default,
                 the dtype is inferred from the data.
+            copy (bool or None, optional):
+                Whether to copy the data, False is not supported.
 
         Returns:
             numpy.ndarray:
diff --git a/third_party/bigframes_vendored/pandas/core/series.py b/third_party/bigframes_vendored/pandas/core/series.py
index 57f7dfbb79..5e6f546d09 100644
--- a/third_party/bigframes_vendored/pandas/core/series.py
+++ b/third_party/bigframes_vendored/pandas/core/series.py
@@ -5941,7 +5941,7 @@ def size(self) -> int:
         """
         raise NotImplementedError(constants.ABSTRACT_METHOD_ERROR_MESSAGE)
 
-    def __array__(self, dtype=None) -> numpy.ndarray:
+    def __array__(self, dtype=None, copy: Optional[bool] = None) -> numpy.ndarray:
         """
         Returns the values as NumPy array.
 
@@ -5965,6 +5965,8 @@ def __array__(self, dtype=None) -> numpy.ndarray:
             dtype (str or numpy.dtype, optional):
                 The dtype to use for the resulting NumPy array. By default,
                 the dtype is inferred from the data.
+            copy (bool or None, optional):
+                Whether to copy the data, False is not supported.
 
         Returns:
             numpy.ndarray: