diff --git a/.github/workflows/unit-tests.yml b/.github/workflows/unit-tests.yml
index 892015f..8ba329e 100644
--- a/.github/workflows/unit-tests.yml
+++ b/.github/workflows/unit-tests.yml
@@ -10,7 +10,7 @@ jobs:
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:
-        ruby-version: 2.6.6
+        ruby-version: 2.6
     - name: Install dependencies (bundle)
       run: bundle install
     - name: Run tests
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2cb2f8b..b99d0fe 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog for the JSON Rails Logger gem
 
+## 0.3.5.5 - 2023-05-10
+
+- (Jon) Reverted the `gemspec` file to ensure the gem accepts higher ruby versions
+and allows it to work with current app integrations; e.g. regulated products
+- (Jon) Reverted the `unit_tests.yml` file to ensure the test accepts higher ruby
+versions and allows it to work with current app integrations; e.g. regulated products
+
 ## 0.3.5.4 - 2023-03-24
 
 - (Jon) Removed the rails specific properties from the JSON output as they are not
diff --git a/json_rails_logger.gemspec b/json_rails_logger.gemspec
index 7853cdd..19993f0 100644
--- a/json_rails_logger.gemspec
+++ b/json_rails_logger.gemspec
@@ -11,7 +11,7 @@ Gem::Specification.new do |spec|
   spec.email       = 'info@epimorphics.com'
   spec.homepage    = 'https://github.com/epimorphics/json-rails-logger'
   spec.license     = 'MIT'
-  spec.required_ruby_version = '= 2.6.6'
+  spec.required_ruby_version = '>= 2.6'
 
   spec.metadata = {
     'github_repo' => 'git@github.com:epimorphics/json-rails-logger.git',
diff --git a/lib/json_rails_logger/json_formatter.rb b/lib/json_rails_logger/json_formatter.rb
index 5b3d78a..7bf2df5 100644
--- a/lib/json_rails_logger/json_formatter.rb
+++ b/lib/json_rails_logger/json_formatter.rb
@@ -7,7 +7,7 @@ class JsonFormatter < ::Logger::Formatter
       method path status duration user_agent accept request_id
     ].freeze
 
-    def call(severity, timestamp, progname, raw_msg)
+    def call(severity, timestamp, _progname, raw_msg)
       sev = process_severity(severity)
       timestp = process_timestamp(timestamp)
       msg = process_message(raw_msg)
@@ -46,7 +46,7 @@ def process_message(raw_msg)
       return get_message(msg) if get_message?(msg)
       return user_agent_message(msg) if user_agent_message?(msg)
 
-      { message: msg.strip }
+      { message: msg.squish }
     end
 
     # rubocop:disable Metrics/AbcSize
@@ -55,6 +55,8 @@ def format_message(msg)
 
       return msg.merge(new_msg) if string_message_field?(msg)
 
+      return new_msg.merge(msg) if !msg.is_a?(Enumerable)
+
       split_msg = msg.partition { |k, _v| COMMON_KEYS.include?(k.to_s) }.map(&:to_h)
 
       # If duration is a float, convert it to an integer as microseconds
diff --git a/lib/json_rails_logger/version.rb b/lib/json_rails_logger/version.rb
index fc75cdf..189d76b 100644
--- a/lib/json_rails_logger/version.rb
+++ b/lib/json_rails_logger/version.rb
@@ -4,7 +4,6 @@ module JsonRailsLogger
   MAJOR = 0
   MINOR = 3
   PATCH = 5
-  SUFFIX = 4
+  SUFFIX = 5
   VERSION = "#{MAJOR}.#{MINOR}.#{PATCH}#{SUFFIX && '.' + SUFFIX.to_s}"
-
 end