diff --git a/Casks/thunderbird-pt-br.rb b/Casks/thunderbird-pt-br.rb
index ba25a69c5..42ad9ed29 100644
--- a/Casks/thunderbird-pt-br.rb
+++ b/Casks/thunderbird-pt-br.rb
@@ -1,6 +1,6 @@
 cask 'thunderbird-pt-br' do
-  version '45.2.0'
-  sha256 'd88e9aac6d7a13bbeae522ccb1603bc39c84d485ae5ee2cbff9b4ce682c9ba27'
+  version '45.3.0'
+  sha256 '52deef211b46c17b1184894b5313e27b963d99d2acf36229a97727549c68b680'
 
   url "https://download.mozilla.org/?product=thunderbird-#{version}&os=osx&lang=pt-BR"
   name 'Mozilla Thunderbird'