diff --git a/pkgs/applications/networking/browsers/firefox/packages.nix b/pkgs/applications/networking/browsers/firefox/packages.nix
index a4f423fd8ab..e378efa475e 100644
--- a/pkgs/applications/networking/browsers/firefox/packages.nix
+++ b/pkgs/applications/networking/browsers/firefox/packages.nix
@@ -35,10 +35,10 @@ rec {
 
   firefox-esr-78 = common rec {
     pname = "firefox-esr";
-    ffversion = "78.1.0esr";
+    ffversion = "78.2.0esr";
     src = fetchurl {
       url = "mirror://mozilla/firefox/releases/${ffversion}/source/firefox-${ffversion}.source.tar.xz";
-      sha512 = "223v796vjsvgs3yw442c8qbsbh43l1aniial05rl70hx44rh9sg108ripj8q83p5l9m0sp67x6ixd2xvifizv6461a1zra1rvbb1caa";
+      sha512 = "1dnvr9nyvnv5dkpnjnadff38lf9r7g37gk401c1i22d661ib5xj0gm2rnz1rjyrkvzrnr6p9f7liy3i41varja00g0x1racccj1my9q";
     };
 
     patches = [