diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index d11c8fc..eba8a04 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "3.20.0"
+  ".": "3.21.0"
 }
\ No newline at end of file
diff --git a/.stats.yml b/.stats.yml
index 391cde3..0339c57 100644
--- a/.stats.yml
+++ b/.stats.yml
@@ -1,4 +1,4 @@
 configured_endpoints: 8
-openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/browserbase/stagehand-6f6bfb81d092f30a5e2005328c97d61b9ea36132bb19e9e79e55294b9534ce20.yml
-openapi_spec_hash: f3fc1e3688a38dc2c28f7178f7d534e5
+openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/browserbase/stagehand-eae8400fade7b2c8329c4148f56de92e147c34c0feecb420c015aab6544a9acc.yml
+openapi_spec_hash: 0a9eff1ac1d464e89cbd9db64709b08a
 config_hash: 1fb12ae9b478488bc1e56bfbdc210b01
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8fd0ed0..97e27ac 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## 3.21.0 (2026-05-07)
+
+Full Changelog: [v3.20.0...v3.21.0](https://github.com/browserbase/stagehand-ruby/compare/v3.20.0...v3.21.0)
+
+### Features
+
+* [feat]: add `ignoreSelectors` to `observe()` ([0acc093](https://github.com/browserbase/stagehand-ruby/commit/0acc093944e72ee488393ec1fb73dc16450cc825))
+
 ## 3.20.0 (2026-05-06)
 
 Full Changelog: [v3.19.3...v3.20.0](https://github.com/browserbase/stagehand-ruby/compare/v3.19.3...v3.20.0)
diff --git a/Gemfile.lock b/Gemfile.lock
index 4490644..adcbab3 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -11,7 +11,7 @@ GIT
 PATH
   remote: .
   specs:
-    stagehand (3.20.0)
+    stagehand (3.21.0)
       cgi
       connection_pool
 
diff --git a/lib/stagehand/models/session_observe_params.rb b/lib/stagehand/models/session_observe_params.rb
index b2c2f74..8564643 100644
--- a/lib/stagehand/models/session_observe_params.rb
+++ b/lib/stagehand/models/session_observe_params.rb
@@ -52,6 +52,12 @@ class SessionObserveParams < Stagehand::Internal::Type::BaseModel
       #   @param request_options [Stagehand::RequestOptions, Hash{Symbol=>Object}]
 
       class Options < Stagehand::Internal::Type::BaseModel
+        # @!attribute ignore_selectors
+        #   Selectors for elements and subtrees that should be excluded from observation
+        #
+        #   @return [Array<String>, nil]
+        optional :ignore_selectors, Stagehand::Internal::Type::ArrayOf[String], api_name: :ignoreSelectors
+
         # @!attribute model
         #   Model configuration object or model name string (e.g., 'openai/gpt-5-nano')
         #
@@ -79,10 +85,12 @@ class Options < Stagehand::Internal::Type::BaseModel
         optional :variables,
                  -> { Stagehand::Internal::Type::HashOf[union: Stagehand::SessionObserveParams::Options::Variable] }
 
-        # @!method initialize(model: nil, selector: nil, timeout: nil, variables: nil)
+        # @!method initialize(ignore_selectors: nil, model: nil, selector: nil, timeout: nil, variables: nil)
         #   Some parameter documentations has been truncated, see
         #   {Stagehand::Models::SessionObserveParams::Options} for more details.
         #
+        #   @param ignore_selectors [Array<String>] Selectors for elements and subtrees that should be excluded from observation
+        #
         #   @param model [Stagehand::Models::ModelConfig, String] Model configuration object or model name string (e.g., 'openai/gpt-5-nano')
         #
         #   @param selector [String] CSS selector to scope observation to a specific element
diff --git a/lib/stagehand/version.rb b/lib/stagehand/version.rb
index 2fbf718..bffebd2 100644
--- a/lib/stagehand/version.rb
+++ b/lib/stagehand/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module Stagehand
-  VERSION = "3.20.0"
+  VERSION = "3.21.0"
 end
diff --git a/rbi/stagehand/models/session_observe_params.rbi b/rbi/stagehand/models/session_observe_params.rbi
index ba48ed4..240e691 100644
--- a/rbi/stagehand/models/session_observe_params.rbi
+++ b/rbi/stagehand/models/session_observe_params.rbi
@@ -100,6 +100,13 @@ module Stagehand
             )
           end
 
+        # Selectors for elements and subtrees that should be excluded from observation
+        sig { returns(T.nilable(T::Array[String])) }
+        attr_reader :ignore_selectors
+
+        sig { params(ignore_selectors: T::Array[String]).void }
+        attr_writer :ignore_selectors
+
         # Model configuration object or model name string (e.g., 'openai/gpt-5-nano')
         sig { returns(T.nilable(T.any(Stagehand::ModelConfig, String))) }
         attr_reader :model
@@ -161,6 +168,7 @@ module Stagehand
 
         sig do
           params(
+            ignore_selectors: T::Array[String],
             model: T.any(Stagehand::ModelConfig::OrHash, String),
             selector: String,
             timeout: Float,
@@ -177,6 +185,8 @@ module Stagehand
           ).returns(T.attached_class)
         end
         def self.new(
+          # Selectors for elements and subtrees that should be excluded from observation
+          ignore_selectors: nil,
           # Model configuration object or model name string (e.g., 'openai/gpt-5-nano')
           model: nil,
           # CSS selector to scope observation to a specific element
@@ -193,6 +203,7 @@ module Stagehand
         sig do
           override.returns(
             {
+              ignore_selectors: T::Array[String],
               model: T.any(Stagehand::ModelConfig, String),
               selector: String,
               timeout: Float,
diff --git a/sig/stagehand/models/session_observe_params.rbs b/sig/stagehand/models/session_observe_params.rbs
index 4aad068..063b837 100644
--- a/sig/stagehand/models/session_observe_params.rbs
+++ b/sig/stagehand/models/session_observe_params.rbs
@@ -54,6 +54,7 @@ module Stagehand
 
       type options =
         {
+          ignore_selectors: ::Array[String],
           model: Stagehand::Models::SessionObserveParams::Options::model,
           selector: String,
           timeout: Float,
@@ -61,6 +62,10 @@ module Stagehand
         }
 
       class Options < Stagehand::Internal::Type::BaseModel
+        attr_reader ignore_selectors: ::Array[String]?
+
+        def ignore_selectors=: (::Array[String]) -> ::Array[String]
+
         attr_reader model: Stagehand::Models::SessionObserveParams::Options::model?
 
         def model=: (
@@ -82,6 +87,7 @@ module Stagehand
         ) -> ::Hash[Symbol, Stagehand::Models::SessionObserveParams::Options::variable]
 
         def initialize: (
+          ?ignore_selectors: ::Array[String],
           ?model: Stagehand::Models::SessionObserveParams::Options::model,
           ?selector: String,
           ?timeout: Float,
@@ -89,6 +95,7 @@ module Stagehand
         ) -> void
 
         def to_hash: -> {
+          ignore_selectors: ::Array[String],
           model: Stagehand::Models::SessionObserveParams::Options::model,
           selector: String,
           timeout: Float,