diff --git a/pkgs/applications/networking/browsers/firefox/packages.nix b/pkgs/applications/networking/browsers/firefox/packages.nix
index 321a530038e8..05f2524f9492 100644
--- a/pkgs/applications/networking/browsers/firefox/packages.nix
+++ b/pkgs/applications/networking/browsers/firefox/packages.nix
@@ -32,10 +32,10 @@ rec {
 
   firefox-esr-78 = common rec {
     pname = "firefox-esr";
-    ffversion = "78.10.0esr";
+    ffversion = "78.10.1esr";
     src = fetchurl {
       url = "mirror://mozilla/firefox/releases/${ffversion}/source/firefox-${ffversion}.source.tar.xz";
-      sha512 = "5e2cf137dc781855542c29df6152fa74ba749801640ade3cf01487ce993786b87a4f603d25c0af9323e67c7e15c75655523428c1c1426527b8623c7ded9f5946";
+      sha512 = "a22773d9b3f0dca253805257f358a906769d23f15115e3a8851024f701e27dee45f056f7d34ebf1fcde0a3f91ec299639c2a12556e938a232cdea9e59835fde1";
     };
 
     meta = {