diff --git a/README.md b/README.md
index 083ab6d..2f33c0a 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,9 @@
 # LiveKit Server API for Ruby
 
 <!--BEGIN_DESCRIPTION-->
+
 Use this SDK to interact with <a href="https://livekit.io/">LiveKit</a> server APIs and create access tokens from your Ruby backend.
+
 <!--END_DESCRIPTION-->
 
 This library is designed to work with Ruby 2.6.0 and above.
@@ -46,8 +48,8 @@ require 'livekit'
 token = LiveKit::AccessToken.new(api_key: 'yourkey', api_secret: 'yoursecret')
 token.identity = 'participant-identity'
 token.name = 'participant-name'
-token.add_grant(roomJoin: true, room: 'room-name')
-
+token.set_video_grant(LiveKit::VideoGrant.new(roomJoin: true, room: 'room-name'))
+token.attributes = { "mykey" => "myvalue" }
 puts token.to_jwt
 ```
 
@@ -136,7 +138,9 @@ You may store credentials in environment variables. If api-key or api-secret is
 The gem is available as open source under the terms of Apache 2.0 License.
 
 <!--BEGIN_REPO_NAV-->
+
 <br/><table>
+
 <thead><tr><th colspan="2">LiveKit Ecosystem</th></tr></thead>
 <tbody>
 <tr><td>Realtime SDKs</td><td><a href="https://github.com/livekit/components-js">React Components</a> · <a href="https://github.com/livekit/client-sdk-js">Browser</a> · <a href="https://github.com/livekit/components-swift">Swift Components</a> · <a href="https://github.com/livekit/client-sdk-swift">iOS/macOS/visionOS</a> · <a href="https://github.com/livekit/client-sdk-android">Android</a> · <a href="https://github.com/livekit/client-sdk-flutter">Flutter</a> · <a href="https://github.com/livekit/client-sdk-react-native">React Native</a> · <a href="https://github.com/livekit/rust-sdks">Rust</a> · <a href="https://github.com/livekit/node-sdks">Node.js</a> · <a href="https://github.com/livekit/python-sdks">Python</a> · <a href="https://github.com/livekit/client-sdk-unity-web">Unity (web)</a> · <a href="https://github.com/livekit/client-sdk-unity">Unity (beta)</a></td></tr><tr></tr>
@@ -147,4 +151,3 @@ The gem is available as open source under the terms of Apache 2.0 License.
 </tbody>
 </table>
 <!--END_REPO_NAV-->
-
diff --git a/lib/livekit/access_token.rb b/lib/livekit/access_token.rb
index bd9ddd0..f3eb7b5 100644
--- a/lib/livekit/access_token.rb
+++ b/lib/livekit/access_token.rb
@@ -31,17 +31,27 @@ def initialize(
       @ttl = ttl
     end
 
+    # Deprecated, use set_video_grant instead
     def add_grant(video_grant)
       if video_grant.is_a?(Hash)
         video_grant = VideoGrant.from_hash(video_grant)
       end
+      self.set_video_grant(video_grant)
+    end
+
+    def set_video_grant(video_grant)
       @grants.video = video_grant
     end
 
+    # Deprecated, use set_sip_grant instead
     def add_sip_grant(sip_grant)
       if sip_grant.is_a?(Hash)
         sip_grant = SIPGrant.from_hash(sip_grant)
       end
+      self.set_sip_grant(sip_grant)
+    end
+
+    def set_sip_grant(sip_grant)
       @grants.sip = sip_grant
     end
 
@@ -49,6 +59,10 @@ def metadata=(participant_md)
       @grants.metadata = participant_md
     end
 
+    def attributes=(participant_attributes)
+      @grants.attributes = participant_attributes
+    end
+
     def name=(participant_name)
       @grants.name = participant_name
     end
diff --git a/lib/livekit/auth_mixin.rb b/lib/livekit/auth_mixin.rb
index 42e2349..b733df7 100644
--- a/lib/livekit/auth_mixin.rb
+++ b/lib/livekit/auth_mixin.rb
@@ -10,10 +10,10 @@ def auth_header(
       headers = {}
       t = ::LiveKit::AccessToken.new(api_key: @api_key, api_secret: @api_secret)
       if video_grant != nil
-        t.add_grant(video_grant)
+        t.set_video_grant(video_grant)
       end
       if sip_grant != nil
-        t.add_sip_grant(sip_grant)
+        t.set_sip_grant(sip_grant)
       end
       headers["Authorization"] = "Bearer #{t.to_jwt}"
       headers["User-Agent"] = "LiveKit Ruby SDK"
diff --git a/spec/livekit/access_token_spec.rb b/spec/livekit/access_token_spec.rb
index 5e53260..19dced8 100644
--- a/spec/livekit/access_token_spec.rb
+++ b/spec/livekit/access_token_spec.rb
@@ -6,7 +6,7 @@
 RSpec.describe LiveKit::AccessToken do
   it "generates a valid JWT with defaults" do
     token = described_class.new(api_key: TEST_KEY, api_secret: TEST_SECRET)
-    token.add_grant LiveKit::VideoGrant.new
+    token.set_video_grant LiveKit::VideoGrant.new
     jwt = token.to_jwt
     decoded = JWT.decode(jwt, TEST_SECRET, true, algorithm: "HS256")
     expect(decoded.first["iss"]).to eq(TEST_KEY)
@@ -24,7 +24,7 @@
     token = described_class.new(api_key: TEST_KEY, api_secret: TEST_SECRET,
                                 identity: "test_identity", ttl: 60)
     token.name = "myname"
-    token.add_grant(LiveKit::VideoGrant.new(roomJoin: true, room: "myroom", canPublish: false))
+    token.set_video_grant(LiveKit::VideoGrant.new(roomJoin: true, room: "myroom", canPublish: false))
     jwt = token.to_jwt
 
     decoded = JWT.decode(jwt, TEST_SECRET, true, algorithm: "HS256")
diff --git a/spec/livekit/token_verifier_spec.rb b/spec/livekit/token_verifier_spec.rb
index 148dc76..d6a1e0f 100644
--- a/spec/livekit/token_verifier_spec.rb
+++ b/spec/livekit/token_verifier_spec.rb
@@ -5,7 +5,8 @@
     token = LiveKit::AccessToken.new(api_key: TEST_KEY, api_secret: TEST_SECRET,
                                      identity: "user")
     token.name = "name"
-    token.add_grant LiveKit::VideoGrant.new(roomJoin: true, room: "testroom")
+    token.set_video_grant LiveKit::VideoGrant.new(roomJoin: true, room: "testroom")
+    token.attributes = { "mykey" => "myvalue" }
     jwt = token.to_jwt
     v = described_class.new(api_key: TEST_KEY, api_secret: TEST_SECRET)
     grant = v.verify(jwt)
@@ -13,12 +14,13 @@
     expect(grant.video.room).to eq("testroom")
     expect(grant.name).to eq("name")
     expect(grant.identity).to eq("user")
+    expect(grant.attributes["mykey"]).to eq("myvalue")
   end
 
   it "fails on expired tokens" do
     token = LiveKit::AccessToken.new(api_key: TEST_KEY, api_secret: TEST_SECRET,
                                      identity: "test_identity", ttl: -10)
-    token.add_grant(LiveKit::VideoGrant.new(roomJoin: true))
+    token.set_video_grant(LiveKit::VideoGrant.new(roomJoin: true))
     jwt = token.to_jwt
 
     v = described_class.new(api_key: TEST_KEY, api_secret: TEST_SECRET)
@@ -28,7 +30,7 @@
   it "fails on invalid secret" do
     token = LiveKit::AccessToken.new(api_key: TEST_KEY, api_secret: TEST_SECRET,
                                      identity: "test_identity")
-    token.add_grant(LiveKit::VideoGrant.new(roomJoin: true))
+    token.set_video_grant(LiveKit::VideoGrant.new(roomJoin: true))
     jwt = token.to_jwt
 
     v = described_class.new(api_key: TEST_KEY, api_secret: "wrong-secret")
@@ -38,7 +40,7 @@
   it "fails on invalid api-key" do
     token = LiveKit::AccessToken.new(api_key: TEST_KEY, api_secret: TEST_SECRET,
                                      identity: "test_identity")
-    token.add_grant(LiveKit::VideoGrant.new(roomJoin: true))
+    token.set_video_grant(LiveKit::VideoGrant.new(roomJoin: true))
     jwt = token.to_jwt
 
     v = described_class.new(api_key: "wrong key", api_secret: TEST_SECRET)