diff --git a/.rubocop.yml b/.rubocop.yml
index e0a2b37..e11331a 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -9,10 +9,16 @@ Metrics/LineLength:
 Style/SymbolArray:
   MinSize: 3
 
+Style/FrozenStringLiteralComment:
+  Enabled: false
+
+Gemspec/RubyVersionGlobalsUsage:
+  Enabled: false
+
 Metrics/MethodLength:
   Max: 15
 
-Naming/UncommunicativeMethodParamName:
+Naming/MethodParameterName:
   MinNameLength: 1
   AllowNamesEndingInNumbers: false
 
diff --git a/README.md b/README.md
index 4d5937e..5046280 100644
--- a/README.md
+++ b/README.md
@@ -149,6 +149,9 @@ You can find plan API documentation at <https://razorpay.com/docs/subscriptions/
 ```rb
 # Creating a subscription and starting after 24 hours (24 hours = 60 * 60 * 24)
 subscription = Razorpay::Subscription.create plan_id: plan.id, customer_id: customer.id, start_at: (Time.now + (60 * 60 * 24)).to_i, total_count: 3
+
+# Update a subscription
+Razorpa::Subscription.update 'sub_AbcdXYz', { start_at: (Time.now + (60 * 60 * 24)).to_i, quantity: 5 }
 ```
 
 You can find subscription API documentation at <https://razorpay.com/docs/subscriptions/api/#subscription>.
diff --git a/lib/razorpay/entity.rb b/lib/razorpay/entity.rb
index 791209c..8c7a61b 100644
--- a/lib/razorpay/entity.rb
+++ b/lib/razorpay/entity.rb
@@ -28,8 +28,8 @@ def respond_to_missing?(method_name, include_private = false)
 
     # Public: Convert the Entity object to JSON
     # Returns the JSON representation of the Entity (as a string)
-    def to_json(*args)
-      @attributes.to_json(*args)
+    def to_json(*_args)
+      @attributes.to_json
     end
 
     # Mutates the entity in accordance with
diff --git a/lib/razorpay/subscription.rb b/lib/razorpay/subscription.rb
index 6b893eb..cedc143 100644
--- a/lib/razorpay/subscription.rb
+++ b/lib/razorpay/subscription.rb
@@ -21,6 +21,10 @@ def self.all(options = {})
       request.all options
     end
 
+    def self.update(id, options = {})
+      request.patch id, options
+    end
+
     def self.cancel(id, options = {})
       request.post "#{id}/cancel", options
     end