diff --git a/pythons/test/update.sh b/pythons/test/update.sh
index 08fe0df..ed7df4c 100755
--- a/pythons/test/update.sh
+++ b/pythons/test/update.sh
@@ -10,15 +10,16 @@ fail() {
 }
 
 write_meta() {
-  cat > binaries/3.14.0-ubuntu-24.04-x86_64.meta <<EOF
+  local name="${2:-3.14.0-ubuntu-24.04-x86_64}"
+  cat > "binaries/$name.meta" <<EOF
 # pyenv-binary metadata
-version=3.14.0
+version=${name%%-*}
 os=Linux
 arch=x86_64
 platform=linux-x86_64
 distro=ubuntu 24.04
 libc=glibc 2.39
-build_prefix=/tmp/pyenv/versions/3.14.0-ubuntu-24.04-x86_64
+build_prefix=/tmp/pyenv/versions/$name
 archive=$1
 EOF
 }
@@ -28,24 +29,36 @@ trap 'rm -rf "$tmpdir"' EXIT
 
 cp update.sh index.html "$tmpdir"
 mkdir "$tmpdir/binaries"
-printf archive-data > "$tmpdir/binaries/3.14.0-ubuntu-24.04-x86_64.tar.gz"
+printf archive-data > "$tmpdir/binaries/3.14.0-ubuntu-24.04-x86_64.tar.xz"
 printf definition > "$tmpdir/binaries/3.14.0-ubuntu-24.04-x86_64"
+gzip_name=3.13.0-ubuntu-24.04-x86_64
+printf gzip-archive-data > "$tmpdir/binaries/$gzip_name.tar.gz"
+printf definition > "$tmpdir/binaries/$gzip_name"
 
 cd "$tmpdir"
-write_meta 3.14.0-ubuntu-24.04-x86_64.tar.gz
+write_meta 3.14.0-ubuntu-24.04-x86_64.tar.xz
+write_meta "$gzip_name.tar.gz" "$gzip_name"
 bash ./update.sh >/dev/null 2>&1 || fail "update failed"
 
 sha=8a6111c3ca752ed6d5f8e8a6daa3ba4b8c3b0bf55f00a87ac2b285024ef87e5f
-[ "binaries/3.14.0-ubuntu-24.04-x86_64.tar.gz" -ef "$sha" ] ||
+[ "binaries/3.14.0-ubuntu-24.04-x86_64.tar.xz" -ef "$sha" ] ||
   fail "checksum path is not a hardlink to the archive"
 
-entry='<li><a href="binaries/3.14.0-ubuntu-24.04-x86_64.tar.gz">3.14.0-ubuntu-24.04-x86_64.tar.gz</a> (<a href="binaries/3.14.0-ubuntu-24.04-x86_64">definition</a>)</li>'
+entry='<li><a href="binaries/3.14.0-ubuntu-24.04-x86_64.tar.xz">3.14.0-ubuntu-24.04-x86_64.tar.xz</a> (<a href="binaries/3.14.0-ubuntu-24.04-x86_64">definition</a>)</li>'
 grep -Fqx "$entry" index.html || fail "prebuilt archive is missing from index.html"
 
+gzip_sha=c809857f5fa564e1a2fdb3618161114bfb9a9c624ade6b580f6d79df0adfcc26
+[ "binaries/$gzip_name.tar.gz" -ef "$gzip_sha" ] ||
+  fail "gzip checksum path is not a hardlink to the archive"
+
+gzip_entry="<li><a href=\"binaries/$gzip_name.tar.gz\">$gzip_name.tar.gz</a> (<a href=\"binaries/$gzip_name\">definition</a>)</li>"
+grep -Fqx "$gzip_entry" index.html || fail "gzip prebuilt archive is missing from index.html"
+
 cp index.html index.before
 bash ./update.sh >/dev/null 2>&1 || fail "second update failed"
 cmp -s index.before index.html || fail "second update changed index.html"
 [ "$(grep -Fxc "$entry" index.html)" -eq 1 ] || fail "prebuilt archive is listed more than once"
+[ "$(grep -Fxc "$gzip_entry" index.html)" -eq 1 ] || fail "gzip prebuilt archive is listed more than once"
 
 bad_name=$'bad\nname'
 printf 'archive=bad\narchive=name.tar.gz\n' > "binaries/$bad_name.meta"
@@ -83,14 +96,14 @@ if bash ./update.sh >/dev/null 2>&1; then
   fail "update accepted an archive outside binaries"
 fi
 
-write_meta 3.14.0-ubuntu-24.04-x86_64.tar.gz
+write_meta 3.14.0-ubuntu-24.04-x86_64.tar.xz
 rm binaries/3.14.0-ubuntu-24.04-x86_64
 if bash ./update.sh >/dev/null 2>&1; then
   fail "update accepted a missing definition"
 fi
 
 printf definition > binaries/3.14.0-ubuntu-24.04-x86_64
-rm binaries/3.14.0-ubuntu-24.04-x86_64.tar.gz
+rm binaries/3.14.0-ubuntu-24.04-x86_64.tar.xz
 if bash ./update.sh >/dev/null 2>&1; then
   fail "update accepted a missing archive"
 fi
diff --git a/pythons/update.sh b/pythons/update.sh
index bfc49e3..a367003 100755
--- a/pythons/update.sh
+++ b/pythons/update.sh
@@ -67,10 +67,13 @@ for meta in binaries/*.meta; do
     exit 1
     ;;
   esac
-  if [ "$archive" != "$name.tar.gz" ]; then
+  case "$archive" in
+  "$name.tar.gz" | "$name.tar.xz") ;;
+  *)
     echo "Invalid archive in $meta" >&2
     exit 1
-  fi
+    ;;
+  esac
   if [ ! -f "binaries/$archive" ] || [ ! -f "binaries/$name" ]; then
     echo "Missing archive or definition for $name" >&2
     exit 1