diff --git a/.github/workflows/run-tests.yml b/.github/workflows/run-tests.yml
index cef45b871..f0a8efbbd 100644
--- a/.github/workflows/run-tests.yml
+++ b/.github/workflows/run-tests.yml
@@ -15,6 +15,7 @@ env:
   SDK_PAM_SEC_KEY: ${{ secrets.SDK_PAM_SEC_KEY }}
   SDK_SUB_KEY: ${{ secrets.SDK_SUB_KEY }}
   SDK_PUB_KEY: ${{ secrets.SDK_PUB_KEY }}
+  SDK_SEC_KEY: ${{ secrets.SDK_SEC_KEY }}
 
 jobs:
   tests:
diff --git a/.pubnub.yml b/.pubnub.yml
index e7b282b09..ebc761e8b 100644
--- a/.pubnub.yml
+++ b/.pubnub.yml
@@ -1,6 +1,11 @@
 ---
-version: "5.5.0"
+version: "5.5.1"
 changelog:
+  - date: 2025-09-08
+    version: v5.5.1
+    changes:
+      - type: bug
+        text: "Fix the issue introduced by RuboCop linter suggestion acceptance, which caused a wrong number of arguments error."
   - date: 2025-01-28
     version: v5.5.0
     changes:
@@ -603,7 +608,7 @@ sdks:
                     - x86-64
           - distribution-type: package
             distribution-repository: RubyGems
-            package-name: pubnub-5.5.0.gem
+            package-name: pubnub-5.5.1.gem
             location: https://rubygems.org/gems/pubnub
             requires:
               - name: addressable
@@ -708,8 +713,8 @@ sdks:
                     - x86-64
           - distribution-type: library
             distribution-repository: GitHub release
-            package-name: pubnub-5.5.0.gem
-            location: https://github.com/pubnub/ruby/releases/download/v5.5.0/pubnub-5.5.0.gem
+            package-name: pubnub-5.5.1.gem
+            location: https://github.com/pubnub/ruby/releases/download/v5.5.1/pubnub-5.5.1.gem
             requires:
               - name: addressable
                 min-version: 2.0.0
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 154271e81..f95953097 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+## v5.5.1
+September 08 2025
+
+#### Fixed
+- Fix the issue introduced by RuboCop linter suggestion acceptance, which caused a wrong number of arguments error.
+
 ## v5.5.0
 January 28 2025
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 229f15223..eeb54f907 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    pubnub (5.5.0)
+    pubnub (5.5.1)
       addressable (>= 2.0.0)
       concurrent-ruby (~> 1.3.4)
       concurrent-ruby-edge (~> 0.7.1)
diff --git a/VERSION b/VERSION
index d50359de1..7acd1cb0e 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-5.5.0
+5.5.1
diff --git a/fixtures/vcr_cassettes/lib/events/fetch_messages_with_secret.yml b/fixtures/vcr_cassettes/lib/events/fetch_messages_with_secret.yml
new file mode 100644
index 000000000..08c06730b
--- /dev/null
+++ b/fixtures/vcr_cassettes/lib/events/fetch_messages_with_secret.yml
@@ -0,0 +1,41 @@
+---
+http_interactions:
+- request:
+    method: get
+    uri: http://ps.pndsn.com/v3/history/sub-key/sub-a-mock-key/channel/channel-1,channel-2?auth=ruby-test-auth&include_message_type=true&include_uuid=true&pnsdk=PubNub-Ruby/5.5.0&signature=v2.quFGaEboQNkHFpbv40y1tZQadAQGavFGUPUeGOyWKHE&timestamp=1756998174&uuid=ruby-test-uuid
+    body:
+      encoding: UTF-8
+      string: ''
+    headers:
+      User-Agent:
+      - HTTPClient/1.0 (2.9.0, ruby 3.2.2 (2023-03-30))
+      Accept:
+      - "*/*"
+      Date:
+      - Thu, 04 Sep 2025 15:02:54 GMT
+  response:
+    status:
+      code: 200
+      message: OK
+    headers:
+      Date:
+      - Thu, 04 Sep 2025 15:02:55 GMT
+      Content-Type:
+      - text/javascript; charset="UTF-8"
+      Content-Length:
+      - '68'
+      Connection:
+      - keep-alive
+      Cache-Control:
+      - no-cache
+      Access-Control-Allow-Methods:
+      - GET, POST, DELETE, OPTIONS
+      Access-Control-Allow-Credentials:
+      - 'true'
+      Access-Control-Expose-Headers:
+      - "*"
+    body:
+      encoding: UTF-8
+      string: '{"status": 200, "error": false, "error_message": "", "channels": {}}'
+  recorded_at: Thu, 04 Sep 2025 15:02:54 GMT
+recorded_with: VCR 6.3.1
diff --git a/lib/pubnub/events/fetch_messages.rb b/lib/pubnub/events/fetch_messages.rb
index 61cd61992..0e681bf08 100644
--- a/lib/pubnub/events/fetch_messages.rb
+++ b/lib/pubnub/events/fetch_messages.rb
@@ -46,7 +46,7 @@ def current_operation
       @include_message_actions ? Pubnub::Constants::OPERATION_FETCH_MESSAGES_WITH_ACTIONS : Pubnub::Constants::OPERATION_FETCH_MESSAGES
     end
 
-    def parameters(signature: false)
+    def parameters(signature = false)
       parameters = super(signature)
       parameters[:include_meta] = 'true' if @include_meta
       parameters[:include_uuid] = 'true' if @include_uuid
diff --git a/lib/pubnub/version.rb b/lib/pubnub/version.rb
index 09002ec51..18022e8d8 100644
--- a/lib/pubnub/version.rb
+++ b/lib/pubnub/version.rb
@@ -1,4 +1,4 @@
 # Toplevel Pubnub module.
 module Pubnub
-  VERSION = '5.5.0'.freeze
+  VERSION = '5.5.1'.freeze
 end
diff --git a/spec/lib/events/fetch_messages_spec.rb b/spec/lib/events/fetch_messages_spec.rb
index 406058ade..f7a7865f3 100644
--- a/spec/lib/events/fetch_messages_spec.rb
+++ b/spec/lib/events/fetch_messages_spec.rb
@@ -13,6 +13,24 @@
       )
     end
 
+    it 'should not crash with secret key' do
+      pubnub_sec = Pubnub::Client.new(
+        subscribe_key: "sub-a-mock-key",
+        publish_key: "pub-a-mock-key",
+        secret_key: "sec-a-mock-key",
+        auth_key: "ruby-test-auth",
+        user_id: "ruby-test-uuid",
+        )
+      VCR.use_cassette("lib/events/fetch_messages_with_secret", record: :once) do
+        expect {
+          pubnub_sec.fetch_messages(
+            channels: %w[channel-1 channel-2],
+            :http_sync => true
+          )
+        }.to_not raise_error(ArgumentError)
+      end
+    end
+
     it 'works with channels list' do
       VCR.use_cassette("lib/events/fetch_messages", record: :once) do
         envelope = @pubnub.fetch_messages(