diff --git a/pythonbuild/downloads.json b/pythonbuild/downloads.json
index 4d19a1579..a02d201bb 100644
--- a/pythonbuild/downloads.json
+++ b/pythonbuild/downloads.json
@@ -102,10 +102,10 @@
         "python_tag": "cp314"
     },
     "cpython-3.15": {
-        "url": "https://www.python.org/ftp/python/3.15.0/Python-3.15.0rc2.tar.xz",
-        "size": 35544464,
-        "sha256": "8d93af5eaaaea5adfd41bd786a7ba3f03f2ad1ab57c6a65e0b963deab91d5ad7",
-        "version": "3.15.0rc2",
+        "url": "https://github.com/python/cpython/archive/55634044b61fec74af2114ff6390b7c84bd21bbf.tar.gz",
+        "size": 44376986,
+        "sha256": "8ecf4043ce1243b9f09786b732cf1ac6450e4992e480b330058783b9bd28a2e6",
+        "version": "3.15.0",
         "licenses": [
             "Python-2.0",
             "CNRI-Python"
diff --git a/pythonbuild/utils.py b/pythonbuild/utils.py
index a599925aa..541e9b899 100644
--- a/pythonbuild/utils.py
+++ b/pythonbuild/utils.py
@@ -399,6 +399,21 @@ def download_entry(key: str, dest_path: pathlib.Path, local_name=None) -> pathli
     local_path = dest_path / (local_name or url[url.rindex("/") + 1 :])
     download_to_path(url, local_path, size, sha256)
 
+    if key == "cpython-3.15":
+        repacked = dest_path / f"Python-{entry['version']}.tar.xz"
+        with tarfile.open(local_path) as source:
+            with tarfile.open(repacked, "w:xz", preset=0) as output:
+                for member in source:
+                    content = source.extractfile(member) if member.isfile() else None
+                    member.name = (
+                        f"Python-{entry['version']}/{member.name.partition('/')[2]}"
+                    )
+                    member.pax_headers = {}
+                    output.addfile(member, content)
+                    if content is not None:
+                        content.close()
+        local_path = repacked
+
     return local_path