diff --git a/README.md b/README.md
index 5db7beb..e6f667b 100755
--- a/README.md
+++ b/README.md
@@ -159,6 +159,22 @@ config.after(:each) do |scenario|
 end
 ```
 
+**To use credentials from environment variables**
+- configuration could be provided in the constructor
+- values from the passed `config` hash will take precedence over configuration in `testrail_config.yml`
+```
+testrail_config = {
+  url: ENV['TESTRAIL_URL']
+  user: ENV['TESTRAIL_USER']
+  password: ENV['TESTRAIL_PASSWORD']
+  run_id: ENV['TESTRAIL_RUN_ID']
+}
+
+config.after(:each) do |scenario|
+    TestrailRSpec::UpdateTestRails.new(scenario, config: testrail_config).upload_result
+end
+```
+
 **Is there any demo available for this gem?**
 
 Yes, you can use this `capybara` demo as an example, https://github.com/prashanth-sams/testrail-rspec
diff --git a/lib/testrail-rspec/update-testrails.rb b/lib/testrail-rspec/update-testrails.rb
index ff0a256..2fb8a8e 100644
--- a/lib/testrail-rspec/update-testrails.rb
+++ b/lib/testrail-rspec/update-testrails.rb
@@ -4,14 +4,20 @@ module TestrailRSpec
   class UpdateTestRails
     attr_accessor :client
 
-    def initialize(scenario)
+    def initialize(scenario, config: {})
       @scenario = scenario
 
       if File.exist? './testrail_config.yml'
         @config = YAML.load_file("./testrail_config.yml")['testrail']
         raise 'TestRail configuration file not loaded successfully' if @config.nil?
-      else
-        raise 'TestRail configuration file is required'
+      end
+
+      if !config.nil? && !config.empty?
+        @config = (@config || {}).merge(config.map { |k, v| [k.to_s, v] }.to_h)
+      end
+
+      if @config.nil? || @config.empty?
+        raise 'TestRail configuration file or hash is required'
       end
 
       setup_testrail_client