diff --git a/Library/Homebrew/diagnostic.rb b/Library/Homebrew/diagnostic.rb
index dc967d623d..f7be8eb219 100644
--- a/Library/Homebrew/diagnostic.rb
+++ b/Library/Homebrew/diagnostic.rb
@@ -511,7 +511,7 @@ module Homebrew
       end
 
       def check_git_version
-        minimum_version = ENV["HOMEBREW_MINIMUM_GIT_VERSION"].freeze
+        minimum_version = ENV["HOMEBREW_MINIMUM_GIT_VERSION"]
         return unless Utils.git_available?
         return if Version.create(Utils.git_version) >= Version.create(minimum_version)
 
diff --git a/Library/Homebrew/tab.rb b/Library/Homebrew/tab.rb
index 7a58ed6e2c..c8649c00e3 100644
--- a/Library/Homebrew/tab.rb
+++ b/Library/Homebrew/tab.rb
@@ -324,7 +324,7 @@ class Tab < OpenStruct
     Time.at(super)
   end
 
-  def to_json
+  def to_json(_opts)
     attributes = {
       "homebrew_version"        => homebrew_version,
       "used_options"            => used_options.as_flags,