diff --git a/lib/stream-chat/client.rb b/lib/stream-chat/client.rb
index 98f2498..a2599fc 100644
--- a/lib/stream-chat/client.rb
+++ b/lib/stream-chat/client.rb
@@ -910,8 +910,7 @@ def revoke_user_token(user_id, before)
     def revoke_users_token(user_ids, before)
       before = StreamChat.normalize_timestamp(before)
 
-      updates = []
-      user_ids.map do |user_id|
+      updates = user_ids.map do |user_id|
         {
           'id' => user_id,
           'set' => {
diff --git a/spec/revoke_tokens_spec.rb b/spec/revoke_tokens_spec.rb
new file mode 100644
index 0000000..ebec1a9
--- /dev/null
+++ b/spec/revoke_tokens_spec.rb
@@ -0,0 +1,35 @@
+# frozen_string_literal: true
+
+require 'stream-chat'
+
+describe StreamChat::Client do
+  let(:client) { described_class.new('test-key', 'test-secret') }
+  let(:timestamp) { '2026-11-10T00:00:00+00:00' }
+  let(:response) { StreamChat::StreamResponse.new({}, Faraday::Response.new(status: 200, response_headers: {})) }
+
+  describe '#revoke_users_token' do
+    it 'sends a partial update for each requested user and normalizes the timestamp' do
+      updates = %w[alice bob].map do |id|
+        { 'id' => id, 'set' => { 'revoke_tokens_issued_before' => timestamp } }
+      end
+      expect(client).to receive(:patch).with('users', data: { users: updates }).and_return(response)
+
+      expect(client.revoke_users_token(%w[alice bob], DateTime.parse(timestamp))).to equal(response)
+    end
+
+    it 'sends an empty update list when no users are requested' do
+      expect(client).to receive(:patch).with('users', data: { users: [] }).and_return(response)
+
+      expect(client.revoke_users_token([], timestamp)).to equal(response)
+    end
+  end
+
+  describe '#revoke_user_token' do
+    it 'sends the requested user and preserves a string timestamp' do
+      updates = [{ 'id' => 'alice', 'set' => { 'revoke_tokens_issued_before' => timestamp } }]
+      expect(client).to receive(:patch).with('users', data: { users: updates }).and_return(response)
+
+      expect(client.revoke_user_token('alice', timestamp)).to equal(response)
+    end
+  end
+end