diff --git a/release_gitter.py b/release_gitter.py
index 55a6b4a..e775e32 100755
--- a/release_gitter.py
+++ b/release_gitter.py
@@ -280,6 +280,7 @@ class PackageAdapter:
         elif content_type in (
             "application/gzip",
             "application/x-tar+gzip",
+            "application/x-tar+xz",
             "application/x-compressed-tar",
         ):
             self._package = TarFile.open(fileobj=BytesIO(response.content), mode="r:*")