diff --git a/pkgs/applications/networking/browsers/firefox/packages.nix b/pkgs/applications/networking/browsers/firefox/packages.nix
index eabd3239586..2b6949d4c34 100644
--- a/pkgs/applications/networking/browsers/firefox/packages.nix
+++ b/pkgs/applications/networking/browsers/firefox/packages.nix
@@ -17,10 +17,10 @@ rec {
 
   firefox = common rec {
     pname = "firefox";
-    ffversion = "69.0.2";
+    ffversion = "70.0";
     src = fetchurl {
       url = "mirror://mozilla/firefox/releases/${ffversion}/source/firefox-${ffversion}.source.tar.xz";
-      sha512 = "2ag1syrvlkch7vl151hkq8abf86p9v6b6gmgcbh26b8wfva1p1ss1x09h4w50zmcc6jq4q5mcxgf1sd9zna552jl90k1y4rqvrrzwl6";
+      sha512 = "1rjji7w0rf4b7h6hyllwav1xcbaiv37jmf5s0n0c3cwf9b76yhf8nhygm1a97m26f6rvbmhcv0dx4l8bh06cz9mcbbxy4lhsn43sr62";
     };
 
     patches = [