diff --git a/CHANGELOG.md b/CHANGELOG.md
index 283895e9..03d0c647 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Change Log
 
+## [4.28.0](https://github.com/plivo/plivo-go/tree/v4.28.0) (2022-07-11)
+**Feature - STIR Attestation**
+- Add stir attestation param as part of Get CDR and Get live call APIs Response
+
 ## [4.27.1](https://github.com/plivo/plivo-ruby/tree/v4.27.1) (2022-06-30)
 - `from_number`, `to_number` and `stir_verification` added to filter param [Retrieve all calls] (https://www.plivo.com/docs/voice/api/call#retrieve-all-calls)
 
diff --git a/README.md b/README.md
index 37ee2780..f18170d3 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,7 @@ The Plivo Ruby SDK makes it simpler to integrate communications into your Ruby a
 Add this line to your application's Gemfile:
 
 ```ruby
-gem 'plivo', '>= 4.27.1'
+gem 'plivo', '>= 4.28.0'
 ```
 
 And then execute:
diff --git a/lib/plivo/resources/calls.rb b/lib/plivo/resources/calls.rb
index e1037714..f86e8cae 100644
--- a/lib/plivo/resources/calls.rb
+++ b/lib/plivo/resources/calls.rb
@@ -231,7 +231,8 @@ def to_s
           request_uuid: @request_uuid,
           direction: @direction,
           caller_name: @caller_name,
-          stir_verification: @stir_verification
+          stir_verification: @stir_verification,
+          stir_attestation: @stir_attestation
         }
         call_details = call_details.select {|k, v| !v.nil? }
         call_details.to_s
diff --git a/lib/plivo/version.rb b/lib/plivo/version.rb
index 973b1064..c55a20bb 100644
--- a/lib/plivo/version.rb
+++ b/lib/plivo/version.rb
@@ -1,3 +1,3 @@
 module Plivo
-  VERSION = "4.27.1".freeze
+  VERSION = "4.28.0".freeze
 end
diff --git a/spec/mocks/callGetResponse.json b/spec/mocks/callGetResponse.json
index 1d32b108..c3d57f64 100644
--- a/spec/mocks/callGetResponse.json
+++ b/spec/mocks/callGetResponse.json
@@ -14,5 +14,6 @@
   "to_number": "919999999999",
   "total_amount": "0.00000",
   "total_rate": "0.03570",
-  "stir_verification": "Verified"
+  "stir_verification": "Verified",
+  "stir_attestation": "A"
 }
\ No newline at end of file
diff --git a/spec/mocks/callListResponse.json b/spec/mocks/callListResponse.json
index 3455bc16..b195cbad 100644
--- a/spec/mocks/callListResponse.json
+++ b/spec/mocks/callListResponse.json
@@ -24,7 +24,8 @@
       "to_number": "14153268174",
       "total_amount": "0.13600",
       "total_rate": "0.00850",
-      "stir_verification": "Not Verified"
+      "stir_verification": "Not Verified",
+      "stir_attestation": ""
     },
     {
       "answer_time": "2015-07-26 16:45:02+05:30",
@@ -42,7 +43,8 @@
       "to_number": "14153268174",
       "total_amount": "0.13600",
       "total_rate": "0.00850",
-      "stir_verification": "Not Applicable"
+      "stir_verification": "Not Applicable",
+      "stir_attestation": ""
     }
   ]
 }
\ No newline at end of file
diff --git a/spec/mocks/liveCallGetResponse.json b/spec/mocks/liveCallGetResponse.json
index 3011b338..a77b95a4 100644
--- a/spec/mocks/liveCallGetResponse.json
+++ b/spec/mocks/liveCallGetResponse.json
@@ -8,5 +8,6 @@
   "request_uuid": "d0a87a1a-b0e9-4ab2-ac07-c22ee87cd04a",
   "session_start": "2017-05-22 13:17:49.050872",
   "to": "919798990001",
-  "stir_verification": "Not Applicable"
+  "stir_verification": "Not Applicable",
+  "stir_attestation": ""
 }
\ No newline at end of file
diff --git a/spec/resource_calls_spec.rb b/spec/resource_calls_spec.rb
index 42d68faf..35f0a4b8 100644
--- a/spec/resource_calls_spec.rb
+++ b/spec/resource_calls_spec.rb
@@ -18,7 +18,8 @@ def to_json(call)
       to_number: call.to_number,
       total_amount: call.total_amount,
       total_rate: call.total_rate,
-      stir_verification: call.stir_verification
+      stir_verification: call.stir_verification,
+      stir_attestation:call.stir_attestation
     }.to_json
   end
 
@@ -33,7 +34,8 @@ def to_json_live(call)
       call_uuid: call.call_uuid,
       request_uuid: call.request_uuid,
       session_start: call.session_start,
-      stir_verification: call.stir_verification
+      stir_verification: call.stir_verification,
+      stir_attestation: call.stir_attestation
     }.to_json
   end