diff --git a/tor-browser/alpha/Dockerfile b/tor-browser/alpha/Dockerfile
index 3dc16c2..9916702 100644
--- a/tor-browser/alpha/Dockerfile
+++ b/tor-browser/alpha/Dockerfile
@@ -33,7 +33,7 @@ RUN useradd --create-home --home-dir $HOME user \
 ENV LANG C.UTF-8
 
 # https://www.torproject.org/projects/torbrowser.html.en
-ENV TOR_VERSION 8.0a10
+ENV TOR_VERSION 8.5a1
 ENV TOR_FINGERPRINT 0x4E2C6E8793298290
 
 # download tor and check signature