diff --git a/fdroidserver/update.py b/fdroidserver/update.py
index e64ab2e7..1337abfd 100644
--- a/fdroidserver/update.py
+++ b/fdroidserver/update.py
@@ -53,6 +53,9 @@ from binascii import hexlify
 
 from PIL import Image, PngImagePlugin
 
+if not hasattr(Image, 'Resampling'):  # Pillow<9.0
+    Image.Resampling = Image
+
 import fdroidserver.index
 
 from . import _, common, metadata
@@ -324,7 +327,7 @@ def resize_icon(iconpath, density):
 
         if any(length > size for length in im.size):
             oldsize = im.size
-            im.thumbnail((size, size), Image.LANCZOS)
+            im.thumbnail((size, size), Image.Resampling.LANCZOS)
             logging.debug("%s was too large at %s - new size is %s" % (
                 iconpath, oldsize, im.size))
             im.save(iconpath, "PNG", optimize=True,
@@ -2397,7 +2400,7 @@ def fill_missing_icon_densities(empty_densities, icon_filename, apk, repo_dir):
 
             size = dpi_to_px(density)
 
-            im.thumbnail((size, size), Image.LANCZOS)
+            im.thumbnail((size, size), Image.Resampling.LANCZOS)
             im.save(icon_path, "PNG", optimize=True,
                     pnginfo=BLANK_PNG_INFO, icc_profile=None)
             empty_densities.remove(density)