diff --git a/pkgs/applications/networking/browsers/firefox/default.nix b/pkgs/applications/networking/browsers/firefox/default.nix
index f9d5768903ea..5c3749f83fa1 100644
--- a/pkgs/applications/networking/browsers/firefox/default.nix
+++ b/pkgs/applications/networking/browsers/firefox/default.nix
@@ -147,8 +147,8 @@ in {
 
   firefox-esr-unwrapped = common {
     pname = "firefox-esr";
-    version = "45.4.0esr";
-    sha512 = "2955e02f829a10186a8b22320fb97d4b0fc2b45721fcffa6295653fd760d516ae72b5656547685ba1e0699b381e28044996d9ee12a8738842b4e6b8acd296715";
+    version = "45.5.0esr";
+    sha512 = "fadac65fcad4bd4701026c9f3d87ba7dec304205e3c375769db7f7de9e596877deed9b21d3e8c34c1ce8ae689dd2979b3627742dfbec9bc0cb16a5cb1ce7507d";
   };
 
 }