diff --git a/default.nix b/default.nix
index 6cf6c97..f8cf038 100644
--- a/default.nix
+++ b/default.nix
@@ -2,6 +2,6 @@ with import <nixpkgs> {};
 stdenv.mkDerivation {
     name = "media";
     buildInputs = [ imagemagick
-                    (python3.withPackages (ps: with ps; [ pyyaml ]))
+                    python3Packages.pyyaml
                   ];
 }
diff --git a/scripts/resize-thumbnails.sh b/scripts/resize-thumbnails.sh
index 61b598b..7d715b9 100755
--- a/scripts/resize-thumbnails.sh
+++ b/scripts/resize-thumbnails.sh
@@ -15,6 +15,6 @@ for x in *; do
     large=$x
     small=../thumbnails-small/$x
     if ! [ -f $small ] || [ $large -nt $small ]; then
-	convert $x -resize x"$thumbnail_height" $small
+	magick $x -resize x"$thumbnail_height" $small
     fi
 done