diff --git a/Casks/thunderbird-gl.rb b/Casks/thunderbird-gl.rb
index 846f4dc37..f206b4602 100644
--- a/Casks/thunderbird-gl.rb
+++ b/Casks/thunderbird-gl.rb
@@ -1,6 +1,6 @@
 cask 'thunderbird-gl' do
-  version '45.2.0'
-  sha256 '0c638e85ccef5f42d1696808053897c5a7c6cc35a309db985f2dc64f3b889c07'
+  version '45.3.0'
+  sha256 'e55163af518cd04c5226adca7e7f7ab24d82c7ce78964e77ae931ca7d129c86b'
 
   url "https://download.mozilla.org/?product=thunderbird-#{version}&os=osx&lang=gl"
   name 'Mozilla Thunderbird'