diff --git a/CHANGELOG.md b/CHANGELOG.md
index fca4372..29a5398 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,13 +1,20 @@
 # Changelog for the JSON Rails Logger gem
 
+## 0.2.2 - 2021-03-02 (Bogdan)
+
+- `timestamp` renamed to `ts` in returning JSON
+- Date format for timestamp changed to `%Y-%m-%dT%H:%M:%S.%3NZ`
+- `request_id` is no longer internally generated if the header is missing from
+  the request, but the field will be missing from the returning JSON instead
+
 ## 0.2.1 - 2021-02-23 (Bogdan)
 
 - Unit tests should now autorun on push and pull_request actions
-- 'x-request-id' renamed to 'request_id' in code and returning JSON
+- `x-request-id` renamed to `request_id` in code and returning JSON
 
 ## 0.2.0 - 2021-02-01 (Bogdan)
 
-- Platform related fields are now grouped together inside the 'rails' field
+- Platform related fields are now grouped together inside the `rails` field
 - Request ID is now present in every log message
 - MIT license file added to the repo
 - Added readme file with usage instructions
diff --git a/Gemfile.lock b/Gemfile.lock
index 5f64d7e..d6a0517 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    json_rails_logger (0.2.1)
+    json_rails_logger (0.2.2)
       json
       lograge
       railties
diff --git a/lib/json_rails_logger/json_formatter.rb b/lib/json_rails_logger/json_formatter.rb
index 46aa837..1c33add 100644
--- a/lib/json_rails_logger/json_formatter.rb
+++ b/lib/json_rails_logger/json_formatter.rb
@@ -14,7 +14,7 @@ def call(severity, timestamp, _progname, raw_msg)
       new_msg = format_message(msg)
 
       payload = { level: sev,
-                  timestamp: timestp }
+                  ts: timestp }
 
       payload.merge!(request_id.to_h)
       payload.merge!(new_msg.to_h)
@@ -29,7 +29,7 @@ def process_severity(severity)
     end
 
     def process_timestamp(timestamp)
-      format_datetime(timestamp)
+      format_datetime(timestamp.utc)
     end
 
     def request_id
diff --git a/lib/json_rails_logger/logger.rb b/lib/json_rails_logger/logger.rb
index 42ff580..3091cb5 100644
--- a/lib/json_rails_logger/logger.rb
+++ b/lib/json_rails_logger/logger.rb
@@ -9,7 +9,7 @@ class Logger < ::Logger
     # binmode: false, shift_period_suffix: '%Y%m%d'
     def initialize(*args)
       @formatter = JsonRailsLogger::JsonFormatter.new
-      @formatter.datetime_format = '%Y-%m-%d %H:%M:%S'
+      @formatter.datetime_format = '%Y-%m-%dT%H:%M:%S.%3NZ'
 
       super(*args, formatter: @formatter)
     end
diff --git a/lib/json_rails_logger/request_id_middleware.rb b/lib/json_rails_logger/request_id_middleware.rb
index c18c92b..61114dc 100644
--- a/lib/json_rails_logger/request_id_middleware.rb
+++ b/lib/json_rails_logger/request_id_middleware.rb
@@ -11,7 +11,7 @@ def initialize(app)
     end
 
     def call(env)
-      request_id = env['action_dispatch.request_id']
+      request_id = env['HTTP_X_REQUEST_ID']
       Thread.current[JsonRailsLogger::REQUEST_ID] = request_id
       @app.call(env)
     ensure
diff --git a/lib/json_rails_logger/version.rb b/lib/json_rails_logger/version.rb
index 71ee29e..f8c6321 100644
--- a/lib/json_rails_logger/version.rb
+++ b/lib/json_rails_logger/version.rb
@@ -3,6 +3,6 @@
 module JsonRailsLogger
   MAJOR = 0
   MINOR = 2
-  FIX = 1
+  FIX = 2
   VERSION = "#{MAJOR}.#{MINOR}.#{FIX}"
 end
diff --git a/test/formatter_test.rb b/test/formatter_test.rb
index f11740a..269993a 100644
--- a/test/formatter_test.rb
+++ b/test/formatter_test.rb
@@ -7,11 +7,11 @@
 describe 'JsonRailsLogger::JsonFormatter' do # rubocop:disable Metrics/BlockLength
   let(:fixture) do
     formatter = JsonRailsLogger::JsonFormatter.new
-    formatter.datetime_format = '%Y-%m-%d %H:%M:%S'
+    formatter.datetime_format = '%Y-%m-%dT%H:%M:%S.%3NZ'
     formatter
   end
 
-  let(:timestamp) { DateTime.parse('2020-12-15T20:15:21') }
+  let(:timestamp) { Time.parse('2020-12-15 20:15:21.286') }
   let(:progname) { 'progname' }
 
   it 'should replace FATAL with ERROR for severity' do
@@ -63,7 +63,7 @@
     _(log_output).must_be_kind_of(String)
 
     json_output = JSON.parse(log_output)
-    _(json_output['timestamp']).must_equal('2020-12-15 20:15:21')
+    _(json_output['ts']).must_equal('2020-12-15T20:15:21.286Z')
   end
 
   it 'should move json to top level if message is json object' do