diff --git a/pkgs/applications/networking/browsers/firefox/packages.nix b/pkgs/applications/networking/browsers/firefox/packages.nix
index 8652e406d4d0..a972526e6305 100644
--- a/pkgs/applications/networking/browsers/firefox/packages.nix
+++ b/pkgs/applications/networking/browsers/firefox/packages.nix
@@ -32,10 +32,10 @@ rec {
 
   firefox-esr = common rec {
     pname = "firefox-esr";
-    version = "52.5.1esr";
+    version = "52.5.2esr";
     src = fetchurl {
       url = "mirror://mozilla/firefox/releases/${version}/source/firefox-${version}.source.tar.xz";
-      sha512 = "37318a9f82fa36fe390b85f536f26be9a6950a5143e74a218477adaffb89c77c1ffe17add4b79b26e320bb3138d418ccbb1371ca11e086d140143ba075947dc0";
+      sha512 = "bbc7dcc4cb392f06fe2e963a3b6372efcfbbcc1ca7218a3ef05885285fe00c9e87e0f8d307bd9363668327eb43542c0600443bd9e6744de64494b96dd00efa5a";
     };
 
     patches =