diff --git a/add_to_pydotorg.py b/add_to_pydotorg.py
index afce207e..244c10ea 100755
--- a/add_to_pydotorg.py
+++ b/add_to_pydotorg.py
@@ -208,6 +208,13 @@ def md5sum_for(filename: str) -> str:
     ).hexdigest()
 
 
+def sha256sum_for(filename: str) -> str:
+    """Returns SHA256 checksum for filename."""
+    return hashlib.sha256(
+        open(filename, "rb").read(),
+    ).hexdigest()
+
+
 def filesize_for(filename: str) -> int:
     return path.getsize(filename)
 
@@ -261,6 +268,7 @@ def build_file_dict(
         "is_source": os_pk == 3,
         "url": download_root + f"{base_version(release)}/{rfile}",
         "md5_sum": md5sum_for(filename),
+        "sha256sum": sha256sum_for(filename),
         "filesize": filesize_for(filename),
         "download_button": add_download,
     }
diff --git a/tests/test_add_to_pydotorg.py b/tests/test_add_to_pydotorg.py
index 7a32971e..b73e250c 100644
--- a/tests/test_add_to_pydotorg.py
+++ b/tests/test_add_to_pydotorg.py
@@ -71,6 +71,7 @@ def test_build_file_dict(tmp_path: Path) -> None:
         "is_source": False,
         "url": f"{release_url}/test-artifact.txt",
         "md5_sum": "3e25960a79dbc69b674cd4ec67a72c62",
+        "sha256sum": "64ec88ca00b268e5ba1a35678a1b5316d212f4f366b2477232534a8aeca37f3c",
         "filesize": 11,
         "download_button": True,
         "sigstore_bundle_file": f"{release_url}/test-artifact.txt.sigstore",