diff --git a/nongnu/packages/mozilla.scm b/nongnu/packages/mozilla.scm
index 4ad928f..fe44c96 100644
--- a/nongnu/packages/mozilla.scm
+++ b/nongnu/packages/mozilla.scm
@@ -78,19 +78,19 @@
 
 ;; Update this id with every firefox update to it's release date.
 ;; It's used for cache validation and therefor can lead to strange bugs.
-(define %firefox-build-id "20210126000000")
+(define %firefox-build-id "20210205000000")
 
 (define-public firefox
   (package
     (name "firefox")
-    (version "85.0")
+    (version "85.0.1")
     (source
      (origin
        (method url-fetch)
        (uri (string-append "https://archive.mozilla.org/pub/firefox/releases/"
                            version "/source/firefox-" version ".source.tar.xz"))
        (sha256
-        (base32 "0l3vgyjhbsjnzgh8zp9g7m6a9kw77vpa6aqxb3j7vrzm88k720sz"))))
+        (base32 "1vkw52294xkgznij9pbfz1rd0c00sffd38j1v8c793nmlim5i3z9"))))
     (build-system gnu-build-system)
     (arguments
      `(#:configure-flags