diff --git a/CHANGES.rst b/CHANGES.rst
index 7c39f22b..a27609af 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -2,6 +2,7 @@
 ------------------
 
 - drop support for numpy 1.25. [#285]
+- require asdf 3.3 and drop support for astropy 5.2 [#297]
 
 0.8.0 (2025-06-11)
 ------------------
diff --git a/asdf_astropy/converters/unit/tests/test_quantity.py b/asdf_astropy/converters/unit/tests/test_quantity.py
index 1d3bb66c..5c0c6f06 100644
--- a/asdf_astropy/converters/unit/tests/test_quantity.py
+++ b/asdf_astropy/converters/unit/tests/test_quantity.py
@@ -4,18 +4,11 @@
 from asdf.testing import helpers
 from astropy import units
 from astropy.units import Quantity
-from astropy.utils.introspection import minversion
 from numpy.testing import assert_array_equal
 
 from asdf_astropy.tests.versions import ASTROPY_GE_7_1
 
 
-def asdf_open_memory_mapping_kwarg(memmap: bool) -> dict:
-    if minversion("asdf", "3.1.0"):
-        return {"memmap": memmap}
-    return {"copy_arrays": not memmap}
-
-
 def create_quantities():
     return [
         # Scalar:
@@ -104,7 +97,7 @@ def test_memmap(tmp_path):
         af.write_to(file_path)
 
     # Update a value in the ASDF file
-    with asdf.open(file_path, mode="rw", **asdf_open_memory_mapping_kwarg(memmap=True)) as af:
+    with asdf.open(file_path, mode="rw", memmap=True) as af:
         assert (af.tree["quantity"] == quantity).all()
         assert af.tree["quantity"][-1, -1] != new_value
 
@@ -114,7 +107,7 @@ def test_memmap(tmp_path):
         assert (af.tree["quantity"] != quantity).any()
         assert (af.tree["quantity"] == new_quantity).all()
 
-    with asdf.open(file_path, mode="rw", **asdf_open_memory_mapping_kwarg(memmap=True)) as af:
+    with asdf.open(file_path, mode="rw", memmap=True) as af:
         assert af.tree["quantity"][-1, -1] == new_value
         assert (af.tree["quantity"] != quantity).any()
         assert (af.tree["quantity"] == new_quantity).all()
@@ -137,7 +130,7 @@ def test_no_memmap(tmp_path):
         af.write_to(file_path)
 
     # Update a value in the ASDF file
-    with asdf.open(file_path, mode="rw", **asdf_open_memory_mapping_kwarg(memmap=False)) as af:
+    with asdf.open(file_path, mode="rw", memmap=False) as af:
         assert (af.tree["quantity"] == quantity).all()
         assert af.tree["quantity"][-1, -1] != new_value
 
@@ -147,7 +140,7 @@ def test_no_memmap(tmp_path):
         assert (af.tree["quantity"] != quantity).any()
         assert (af.tree["quantity"] == new_quantity).all()
 
-    with asdf.open(file_path, mode="rw", **asdf_open_memory_mapping_kwarg(memmap=False)) as af:
+    with asdf.open(file_path, mode="rw", memmap=False) as af:
         assert af.tree["quantity"][-1, -1] != new_value
         assert (af.tree["quantity"] != new_quantity).any()
         assert (af.tree["quantity"] == quantity).all()
diff --git a/pyproject.toml b/pyproject.toml
index 7bc80dca..153e692f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -14,11 +14,11 @@ dynamic = [
   'version',
 ]
 dependencies = [
-  "asdf>=2.15.0",
+  "asdf>=3.3.0",
   "asdf-coordinates-schemas>=0.4",
   "asdf-transform-schemas>=0.6",
   "asdf-standard>=1.1.0",
-  "astropy>=5.2.0",
+  "astropy>=5.3.0",
   "numpy>=1.26",
   "packaging>=19",
 ]