diff --git a/Casks/firefox-esr.rb b/Casks/firefox-esr.rb
index 7fb4f4402..7254d2a89 100644
--- a/Casks/firefox-esr.rb
+++ b/Casks/firefox-esr.rb
@@ -1,78 +1,78 @@
 cask 'firefox-esr' do
-  version '52.3.0'
+  version '52.4.1'
 
   language 'cs' do
-    sha256 '22c8b184d0e69d5384ce5e877a7400924fe3229b5c63a7b6c5a76c658e041fe3'
+    sha256 '8dcbeacbf34b7b80f36e500ee0b5cd4e5c04bcb62886e0bc633df95e999cdcf9'
     'cs'
   end
 
   language 'de' do
-    sha256 '2d9ed91e7b5df92879038ebf098db06eae755d2e69550503e64a9bcc3dbb9b83'
+    sha256 'c9bf7848a8ada72253bbfab87940eb79781a7c697249cd16f7be624fd64be165'
     'de'
   end
 
   language 'en-GB' do
-    sha256 'd6f82401ffad320f4cfb8a34c493d2ead3760c271c0df4641001bfd8842cc2c0'
+    sha256 'a0fbe9cb79566e197bf72ce0bce3c344ca75a0e7df08baa42ea5967de04fe4b1'
     'en-GB'
   end
 
   language 'en', default: true do
-    sha256 'd4681323b7d315a88b0e0c0d8d28d806969e8a91d7f490891fcb7a40d8e8c1e6'
+    sha256 'edcb35dc345e9eb968397d8d9c9a8ebb15f387f33e0c3e09a840e1f8bec7e52a'
     'en-US'
   end
 
   language 'fr' do
-    sha256 'cf2fef76461ec01c7bbe8135782c97458b3f09bc0c3d7b89388332fe85b03e78'
+    sha256 '3098a882abbf264f2fa34172d4baa8821f85995f215c7f6dd153945c8a0b5ca1'
     'fr'
   end
 
   language 'gl' do
-    sha256 '76f711e53ffaeafa7c09fb0b359a469b5bc93013c85fecd609da48847485ef1c'
+    sha256 '7c33384cc93e9392cbac3ed2336c31f6a1e063ccb35e64143ca981841acd4239'
     'gl'
   end
 
   language 'it' do
-    sha256 '4139cbb24a7630451af1546e436a2928fd0480616cb9419e18897a4a4bae6d3b'
+    sha256 '833a717369467dd890b11860433ce76a7a5956294edcb626c811f91e5d56ea6a'
     'it'
   end
 
   language 'ja' do
-    sha256 'abc4d179b08dbe41d01715d996835d611babce166517136583cfa2670c96f1e3'
+    sha256 '57b51aa48e18606452be6ac2767f2408fbb1d9f01344fdb02af5258a6a8711db'
     'ja-JP-mac'
   end
 
   language 'nl' do
-    sha256 '4e86d90f8739481b0e4ba9a55cc21cc6b460ecf2c9dc8b14fa5299a32140dfc3'
+    sha256 'c3927cb413dce11eca48f7c31e73f0023356be4da4bdc96b0526fdd5944b5a6f'
     'nl'
   end
 
   language 'pl' do
-    sha256 '5c8c1a1233288732ae13bdfc1ba57478089e1868f0949a22d359c1569ff68a0c'
+    sha256 '009df23252472f3158f2fde3c8f021f30e297283ae3d3817758fd116855b1155'
     'pl'
   end
 
   language 'pt' do
-    sha256 '2dbdfbbe2cacec9d98deab53e09c96f2a24c74a8a21cbda3022f60ff447f3f2a'
+    sha256 '7628e26b766d9e602f37b6744a353639a32d48b0167392dd359b89853b75c9bf'
     'pt-PT'
   end
 
   language 'ru' do
-    sha256 'b886ba5a8c56da4363454b93297e045026eddf290412fc1816cd3c4b12c37e27'
+    sha256 'ea465cc024ddc32526e7d4adb3fc4dc6957796052ee30844adbc3e7d68d3ec7e'
     'ru'
   end
 
   language 'uk' do
-    sha256 '8501d34eaae1a3289e343e6b8705cf8d2bc0a1b4ac550c78805b10d1e60e645f'
+    sha256 '767782f61049e09ab9a32bca3459380391eb08b13aff31c7159fc3ea905ddc78'
     'uk'
   end
 
   language 'zh-TW' do
-    sha256 '2b213269a3096e4f7560f6bfa27a9df43a0f4e2369ae162ed264deed3cbd4b20'
+    sha256 'a420bf4dd4ed62369fc08790e8e213f54dfa49820dd659e61a98bf600f1ee5fc'
     'zh-TW'
   end
 
   language 'zh' do
-    sha256 '7b119b859a179c4de8b72c4ae2d835e8ef7e28ded7f403d9b1906c17431e2a28'
+    sha256 '4bf343a1249ed740c2a278813d3e31a4047230ed2c088f0531383495deda8de9'
     'zh-CN'
   end