diff --git a/README.md b/README.md
index e0b3dac..f497584 100644
--- a/README.md
+++ b/README.md
@@ -30,6 +30,10 @@ Optional arguments must follow the two version arguments.
 * `--generateDiffStubs` to generate empty diff files for missing mappings
 * `--keepUnknownFields` to keep non-standard fields from json mappings in the compact files
 
+## Updating version files
+On Minecraft updates, the `next_release.txt` and `last_release.txt` files need to be updated manually.
+`last_release.txt` needs the last release **ViaVersion requires mappings for**.
+
 ## Json format
 
 The json files contain a number of Minecraft registries in form of json arrays, where the index corresponds to the id of
diff --git a/download_server.py b/download_server.py
index ba3befc..599fe7b 100644
--- a/download_server.py
+++ b/download_server.py
@@ -60,8 +60,6 @@ def main():
 
     with open(last_snapshot_path, 'w') as f:
         f.write(snapshot)
-    with open(Path('last_release.txt'), 'w') as f:
-        f.write(release)
 
     sys.exit(0)
 
diff --git a/output/mappings-1.20to1.20.nbt b/output/mappings-1.20to1.20.nbt
deleted file mode 100644
index dcb06bd..0000000
Binary files a/output/mappings-1.20to1.20.nbt and /dev/null differ