diff --git a/Library/Homebrew/livecheck/strategy/electron_builder.rb b/Library/Homebrew/livecheck/strategy/electron_builder.rb
index 3d0a4c7437..8bb862e1d4 100644
--- a/Library/Homebrew/livecheck/strategy/electron_builder.rb
+++ b/Library/Homebrew/livecheck/strategy/electron_builder.rb
@@ -47,7 +47,7 @@ module Homebrew
         def self.versions_from_content(content, regex = nil, &block)
           require "yaml"
 
-          yaml = YAML.safe_load(content)
+          yaml = YAML.safe_load(content, permitted_classes: [Date, Time])
           return [] if yaml.blank?
 
           if block
diff --git a/Library/Homebrew/test/livecheck/strategy/electron_builder_spec.rb b/Library/Homebrew/test/livecheck/strategy/electron_builder_spec.rb
index 64c7f64720..cd27271b69 100644
--- a/Library/Homebrew/test/livecheck/strategy/electron_builder_spec.rb
+++ b/Library/Homebrew/test/livecheck/strategy/electron_builder_spec.rb
@@ -25,6 +25,15 @@ describe Homebrew::Livecheck::Strategy::ElectronBuilder do
       releaseDate: '2000-01-01T00:00:00.000Z'
     EOS
   }
+
+  let(:electron_builder_yaml_with_timestamp) {
+    # An electron-builder YAML file may use a timestamp instead of an explicit
+    # string value (with quotes) for `releaseDate`, so we need to make sure that
+    # `ElectronBuilder#versions_from_content` won't encounter an error in this
+    # scenario (e.g. `Tried to load unspecified class: Time`).
+    electron_builder_yaml.sub(/releaseDate:\s*'([^']+)'/, 'releaseDate: \1')
+  }
+
   let(:mac_regex) { /Example[._-]v?(\d+(?:\.\d+)+)[._-]mac\.zip/i }
 
   let(:versions) { ["1.2.3"] }
@@ -46,6 +55,7 @@ describe Homebrew::Livecheck::Strategy::ElectronBuilder do
 
     it "returns an array of version strings when given YAML text" do
       expect(electron_builder.versions_from_content(electron_builder_yaml)).to eq(versions)
+      expect(electron_builder.versions_from_content(electron_builder_yaml_with_timestamp)).to eq(versions)
     end
 
     it "returns an array of version strings when given YAML text and a block" do