diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8ba79ad..1478da9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,9 +1,6 @@
 # Changelog
 
-## 8.0.0
-
-- [#267](https://github.com/castle/castle-ruby/pull/267)
-  - filter out non-string header values
+## master
 
 **BREAKING CHANGES:**
 
diff --git a/lib/castle/headers/filter.rb b/lib/castle/headers/filter.rb
index b5bc729..cb702fd 100644
--- a/lib/castle/headers/filter.rb
+++ b/lib/castle/headers/filter.rb
@@ -29,10 +29,9 @@ def call
           .keys
           .each_with_object({}) do |header_name, acc|
             next unless header_name.match(VALUABLE_HEADERS)
-            next unless @request_env[header_name].is_a?(String)
 
             formatted_name = @header_format.call(header_name)
-            acc[formatted_name] = @request_env[header_name]
+            acc[formatted_name] = @request_env[header_name].to_s
           end
       end
     end
diff --git a/lib/castle/version.rb b/lib/castle/version.rb
index b9bac31..54fb6b6 100644
--- a/lib/castle/version.rb
+++ b/lib/castle/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module Castle
-  VERSION = '8.0.0'
+  VERSION = '7.2.0'
 end
diff --git a/spec/lib/castle/headers/filter_spec.rb b/spec/lib/castle/headers/filter_spec.rb
index 5ec9b23..f759d73 100644
--- a/spec/lib/castle/headers/filter_spec.rb
+++ b/spec/lib/castle/headers/filter_spec.rb
@@ -30,12 +30,13 @@
       'Ok' => 'OK',
       'User-Agent' => 'Mozilla 1234',
       'Remote-Addr' => '1.2.3.4',
-      'X-Forwarded-For' => '1.2.3.4'
+      'X-Forwarded-For' => '1.2.3.4',
+      'Accept-Language.parser' => start_with("#<Proc")
     }
   end
   let(:request) { Rack::Request.new(env) }
 
   context 'with list of header' do
-    it { expect(filter_call).to eq(filtered) }
+    it { expect(filter_call).to match(filtered) }
   end
 end