diff --git a/check_manifest.py b/check_manifest.py
index 23ab7da..b78d657 100755
--- a/check_manifest.py
+++ b/check_manifest.py
@@ -33,7 +33,12 @@
 from distutils.filelist import glob_to_re
 from contextlib import contextmanager, closing
 from distutils.text_file import TextFile
-from xml.etree import cElementTree as ET
+
+try:
+    from xml.etree import cElementTree as ET
+except ImportError:
+    # Python 3.9+
+    from xml.etree import ElementTree as ET
 
 try:
     import ConfigParser
diff --git a/tests.py b/tests.py
index acd10a6..4bb0cc5 100644
--- a/tests.py
+++ b/tests.py
@@ -14,7 +14,7 @@
 import zipfile
 from contextlib import closing
 from io import BytesIO
-from xml.etree import cElementTree as ET
+from xml.etree import ElementTree as ET
 
 try:
     from cStringIO import StringIO  # Python 2.x