diff --git a/pkgs/applications/networking/browsers/firefox/packages.nix b/pkgs/applications/networking/browsers/firefox/packages.nix
index 9f96a53d1c0..c15e070fefb 100644
--- a/pkgs/applications/networking/browsers/firefox/packages.nix
+++ b/pkgs/applications/networking/browsers/firefox/packages.nix
@@ -25,10 +25,10 @@ rec {
 
   firefox-esr = common rec {
     pname = "firefox-esr";
-    version = "52.1.1esr";
+    version = "52.1.2esr";
     src = fetchurl {
       url = "mirror://mozilla/firefox/releases/${version}/source/firefox-${version}.source.tar.xz";
-      sha512 = "23f88de0a084341d54aab107bbf71b965a3f5be192ec8681b8b824c7e13d47968a0e56f4acfd2d2c5487c2e4c963e75ea6aeed400add915b3fb6403ee8810374";
+      sha512 = "76362738f6db82a41ff6af4e12a15a302068a5ce10d23739f29375f3279573d0ea43ecee9d2e46fce833a029e437efcfcceab9442c288560f476e0cff2ea9e1d";
     };
 
     meta = firefox.meta // {