diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 911c623..d11c8fc 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "3.19.3"
+  ".": "3.20.0"
 }
\ No newline at end of file
diff --git a/.stats.yml b/.stats.yml
index ac9e78a..d8428d4 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%2Fstagehand-b969ce378479c79ee64c05127c0ed6c6ce2edbee017ecd037242fb618a5ebc9f.yml
-openapi_spec_hash: a24aabaa5214effb679808b7f2be0ad4
+openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/browserbase%2Fstagehand-1c6caa2891a7f3bdfc0caab143f285badc9145220c9b29cd5e4cf1a9b3ac11cf.yml
+openapi_spec_hash: 28c4b734a5309067c39bb4c4b709b9ab
 config_hash: a962ae71493deb11a1c903256fb25386
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 951b097..5e0efeb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,20 @@
 # Changelog
 
+## 3.20.0 (2026-04-09)
+
+Full Changelog: [v3.19.3...v3.20.0](https://github.com/browserbase/stagehand-ruby/compare/v3.19.3...v3.20.0)
+
+### Features
+
+* [STG-1798] feat: support Browserbase verified sessions ([9647eb3](https://github.com/browserbase/stagehand-ruby/commit/9647eb3a4df86cc9d7aedb2f0a9ddd0babd39565))
+* Bedrock auth passthrough ([5cb6ecb](https://github.com/browserbase/stagehand-ruby/commit/5cb6ecbe621e894dc6c5aec379fdca1183eec4fc))
+* Revert "[STG-1573] Add providerOptions for extensible model auth ([#1822](https://github.com/browserbase/stagehand-ruby/issues/1822))" ([0c83a09](https://github.com/browserbase/stagehand-ruby/commit/0c83a0978116f8fc11a4edf78586f3d61b8af5e8))
+
+
+### Bug Fixes
+
+* multipart encoding for file arrays ([149b303](https://github.com/browserbase/stagehand-ruby/commit/149b303eb54f4c9af037a5e073a2d6c92d959b44))
+
 ## 3.19.3 (2026-04-03)
 
 Full Changelog: [v3.18.0...v3.19.3](https://github.com/browserbase/stagehand-ruby/compare/v3.18.0...v3.19.3)
diff --git a/Gemfile.lock b/Gemfile.lock
index a02c554..4490644 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -11,7 +11,7 @@ GIT
 PATH
   remote: .
   specs:
-    stagehand (3.19.3)
+    stagehand (3.20.0)
       cgi
       connection_pool
 
diff --git a/lib/stagehand/internal/util.rb b/lib/stagehand/internal/util.rb
index 4e9a51e..3ac0058 100644
--- a/lib/stagehand/internal/util.rb
+++ b/lib/stagehand/internal/util.rb
@@ -610,6 +610,7 @@ def encode_query_params(query)
         #
         # @return [Array(String, Enumerable<String>)]
         private def encode_multipart_streaming(body)
+          # rubocop:disable Style/CaseEquality
           # RFC 1521 Section 7.2.1 says we should have 70 char maximum for boundary length
           boundary = SecureRandom.urlsafe_base64(46)
 
@@ -619,7 +620,7 @@ def encode_query_params(query)
             in Hash
               body.each do |key, val|
                 case val
-                in Array if val.all? { primitive?(_1) }
+                in Array if val.all? { primitive?(_1) || Stagehand::Internal::Type::FileInput === _1 }
                   val.each do |v|
                     write_multipart_chunk(y, boundary: boundary, key: key, val: v, closing: closing)
                   end
@@ -635,6 +636,7 @@ def encode_query_params(query)
 
           fused_io = fused_enum(strio) { closing.each(&:call) }
           [boundary, fused_io]
+          # rubocop:enable Style/CaseEquality
         end
 
         # @api private
diff --git a/lib/stagehand/models/session_start_params.rb b/lib/stagehand/models/session_start_params.rb
index 754ec05..e98f6fa 100644
--- a/lib/stagehand/models/session_start_params.rb
+++ b/lib/stagehand/models/session_start_params.rb
@@ -401,6 +401,16 @@ class BrowserSettings < Stagehand::Internal::Type::BaseModel
           #   @return [Boolean, nil]
           optional :block_ads, Stagehand::Internal::Type::Boolean, api_name: :blockAds
 
+          # @!attribute captcha_image_selector
+          #
+          #   @return [String, nil]
+          optional :captcha_image_selector, String, api_name: :captchaImageSelector
+
+          # @!attribute captcha_input_selector
+          #
+          #   @return [String, nil]
+          optional :captcha_input_selector, String, api_name: :captchaInputSelector
+
           # @!attribute context
           #
           #   @return [Stagehand::Models::SessionStartParams::BrowserbaseSessionCreateParams::BrowserSettings::Context, nil]
@@ -423,6 +433,12 @@ class BrowserSettings < Stagehand::Internal::Type::BaseModel
           #   @return [Boolean, nil]
           optional :log_session, Stagehand::Internal::Type::Boolean, api_name: :logSession
 
+          # @!attribute os
+          #
+          #   @return [Symbol, Stagehand::Models::SessionStartParams::BrowserbaseSessionCreateParams::BrowserSettings::Os, nil]
+          optional :os,
+                   enum: -> { Stagehand::SessionStartParams::BrowserbaseSessionCreateParams::BrowserSettings::Os }
+
           # @!attribute record_session
           #
           #   @return [Boolean, nil]
@@ -433,21 +449,30 @@ class BrowserSettings < Stagehand::Internal::Type::BaseModel
           #   @return [Boolean, nil]
           optional :solve_captchas, Stagehand::Internal::Type::Boolean, api_name: :solveCaptchas
 
+          # @!attribute verified
+          #
+          #   @return [Boolean, nil]
+          optional :verified, Stagehand::Internal::Type::Boolean
+
           # @!attribute viewport
           #
           #   @return [Stagehand::Models::SessionStartParams::BrowserbaseSessionCreateParams::BrowserSettings::Viewport, nil]
           optional :viewport,
                    -> { Stagehand::SessionStartParams::BrowserbaseSessionCreateParams::BrowserSettings::Viewport }
 
-          # @!method initialize(advanced_stealth: nil, block_ads: nil, context: nil, extension_id: nil, fingerprint: nil, log_session: nil, record_session: nil, solve_captchas: nil, viewport: nil)
+          # @!method initialize(advanced_stealth: nil, block_ads: nil, captcha_image_selector: nil, captcha_input_selector: nil, context: nil, extension_id: nil, fingerprint: nil, log_session: nil, os: nil, record_session: nil, solve_captchas: nil, verified: nil, viewport: nil)
           #   @param advanced_stealth [Boolean]
           #   @param block_ads [Boolean]
+          #   @param captcha_image_selector [String]
+          #   @param captcha_input_selector [String]
           #   @param context [Stagehand::Models::SessionStartParams::BrowserbaseSessionCreateParams::BrowserSettings::Context]
           #   @param extension_id [String]
           #   @param fingerprint [Stagehand::Models::SessionStartParams::BrowserbaseSessionCreateParams::BrowserSettings::Fingerprint]
           #   @param log_session [Boolean]
+          #   @param os [Symbol, Stagehand::Models::SessionStartParams::BrowserbaseSessionCreateParams::BrowserSettings::Os]
           #   @param record_session [Boolean]
           #   @param solve_captchas [Boolean]
+          #   @param verified [Boolean]
           #   @param viewport [Stagehand::Models::SessionStartParams::BrowserbaseSessionCreateParams::BrowserSettings::Viewport]
 
           # @see Stagehand::Models::SessionStartParams::BrowserbaseSessionCreateParams::BrowserSettings#context
@@ -596,6 +621,20 @@ class Screen < Stagehand::Internal::Type::BaseModel
             end
           end
 
+          # @see Stagehand::Models::SessionStartParams::BrowserbaseSessionCreateParams::BrowserSettings#os
+          module Os
+            extend Stagehand::Internal::Type::Enum
+
+            WINDOWS = :windows
+            MAC = :mac
+            LINUX = :linux
+            MOBILE = :mobile
+            TABLET = :tablet
+
+            # @!method self.values
+            #   @return [Array<Symbol>]
+          end
+
           # @see Stagehand::Models::SessionStartParams::BrowserbaseSessionCreateParams::BrowserSettings#viewport
           class Viewport < Stagehand::Internal::Type::BaseModel
             # @!attribute height
diff --git a/lib/stagehand/version.rb b/lib/stagehand/version.rb
index b4bbb16..2fbf718 100644
--- a/lib/stagehand/version.rb
+++ b/lib/stagehand/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module Stagehand
-  VERSION = "3.19.3"
+  VERSION = "3.20.0"
 end
diff --git a/rbi/stagehand/models/session_start_params.rbi b/rbi/stagehand/models/session_start_params.rbi
index 67dc4c0..4ea4b10 100644
--- a/rbi/stagehand/models/session_start_params.rbi
+++ b/rbi/stagehand/models/session_start_params.rbi
@@ -800,6 +800,18 @@ module Stagehand
           sig { params(block_ads: T::Boolean).void }
           attr_writer :block_ads
 
+          sig { returns(T.nilable(String)) }
+          attr_reader :captcha_image_selector
+
+          sig { params(captcha_image_selector: String).void }
+          attr_writer :captcha_image_selector
+
+          sig { returns(T.nilable(String)) }
+          attr_reader :captcha_input_selector
+
+          sig { params(captcha_input_selector: String).void }
+          attr_writer :captcha_input_selector
+
           sig do
             returns(
               T.nilable(
@@ -846,6 +858,23 @@ module Stagehand
           sig { params(log_session: T::Boolean).void }
           attr_writer :log_session
 
+          sig do
+            returns(
+              T.nilable(
+                Stagehand::SessionStartParams::BrowserbaseSessionCreateParams::BrowserSettings::Os::OrSymbol
+              )
+            )
+          end
+          attr_reader :os
+
+          sig do
+            params(
+              os:
+                Stagehand::SessionStartParams::BrowserbaseSessionCreateParams::BrowserSettings::Os::OrSymbol
+            ).void
+          end
+          attr_writer :os
+
           sig { returns(T.nilable(T::Boolean)) }
           attr_reader :record_session
 
@@ -858,6 +887,12 @@ module Stagehand
           sig { params(solve_captchas: T::Boolean).void }
           attr_writer :solve_captchas
 
+          sig { returns(T.nilable(T::Boolean)) }
+          attr_reader :verified
+
+          sig { params(verified: T::Boolean).void }
+          attr_writer :verified
+
           sig do
             returns(
               T.nilable(
@@ -879,14 +914,19 @@ module Stagehand
             params(
               advanced_stealth: T::Boolean,
               block_ads: T::Boolean,
+              captcha_image_selector: String,
+              captcha_input_selector: String,
               context:
                 Stagehand::SessionStartParams::BrowserbaseSessionCreateParams::BrowserSettings::Context::OrHash,
               extension_id: String,
               fingerprint:
                 Stagehand::SessionStartParams::BrowserbaseSessionCreateParams::BrowserSettings::Fingerprint::OrHash,
               log_session: T::Boolean,
+              os:
+                Stagehand::SessionStartParams::BrowserbaseSessionCreateParams::BrowserSettings::Os::OrSymbol,
               record_session: T::Boolean,
               solve_captchas: T::Boolean,
+              verified: T::Boolean,
               viewport:
                 Stagehand::SessionStartParams::BrowserbaseSessionCreateParams::BrowserSettings::Viewport::OrHash
             ).returns(T.attached_class)
@@ -894,12 +934,16 @@ module Stagehand
           def self.new(
             advanced_stealth: nil,
             block_ads: nil,
+            captcha_image_selector: nil,
+            captcha_input_selector: nil,
             context: nil,
             extension_id: nil,
             fingerprint: nil,
             log_session: nil,
+            os: nil,
             record_session: nil,
             solve_captchas: nil,
+            verified: nil,
             viewport: nil
           )
           end
@@ -909,14 +953,19 @@ module Stagehand
               {
                 advanced_stealth: T::Boolean,
                 block_ads: T::Boolean,
+                captcha_image_selector: String,
+                captcha_input_selector: String,
                 context:
                   Stagehand::SessionStartParams::BrowserbaseSessionCreateParams::BrowserSettings::Context,
                 extension_id: String,
                 fingerprint:
                   Stagehand::SessionStartParams::BrowserbaseSessionCreateParams::BrowserSettings::Fingerprint,
                 log_session: T::Boolean,
+                os:
+                  Stagehand::SessionStartParams::BrowserbaseSessionCreateParams::BrowserSettings::Os::OrSymbol,
                 record_session: T::Boolean,
                 solve_captchas: T::Boolean,
+                verified: T::Boolean,
                 viewport:
                   Stagehand::SessionStartParams::BrowserbaseSessionCreateParams::BrowserSettings::Viewport
               }
@@ -1348,6 +1397,55 @@ module Stagehand
             end
           end
 
+          module Os
+            extend Stagehand::Internal::Type::Enum
+
+            TaggedSymbol =
+              T.type_alias do
+                T.all(
+                  Symbol,
+                  Stagehand::SessionStartParams::BrowserbaseSessionCreateParams::BrowserSettings::Os
+                )
+              end
+            OrSymbol = T.type_alias { T.any(Symbol, String) }
+
+            WINDOWS =
+              T.let(
+                :windows,
+                Stagehand::SessionStartParams::BrowserbaseSessionCreateParams::BrowserSettings::Os::TaggedSymbol
+              )
+            MAC =
+              T.let(
+                :mac,
+                Stagehand::SessionStartParams::BrowserbaseSessionCreateParams::BrowserSettings::Os::TaggedSymbol
+              )
+            LINUX =
+              T.let(
+                :linux,
+                Stagehand::SessionStartParams::BrowserbaseSessionCreateParams::BrowserSettings::Os::TaggedSymbol
+              )
+            MOBILE =
+              T.let(
+                :mobile,
+                Stagehand::SessionStartParams::BrowserbaseSessionCreateParams::BrowserSettings::Os::TaggedSymbol
+              )
+            TABLET =
+              T.let(
+                :tablet,
+                Stagehand::SessionStartParams::BrowserbaseSessionCreateParams::BrowserSettings::Os::TaggedSymbol
+              )
+
+            sig do
+              override.returns(
+                T::Array[
+                  Stagehand::SessionStartParams::BrowserbaseSessionCreateParams::BrowserSettings::Os::TaggedSymbol
+                ]
+              )
+            end
+            def self.values
+            end
+          end
+
           class Viewport < Stagehand::Internal::Type::BaseModel
             OrHash =
               T.type_alias do
diff --git a/sig/stagehand/models/session_start_params.rbs b/sig/stagehand/models/session_start_params.rbs
index c9cae4c..af70a2b 100644
--- a/sig/stagehand/models/session_start_params.rbs
+++ b/sig/stagehand/models/session_start_params.rbs
@@ -450,12 +450,16 @@ module Stagehand
           {
             advanced_stealth: bool,
             block_ads: bool,
+            captcha_image_selector: String,
+            captcha_input_selector: String,
             context: Stagehand::SessionStartParams::BrowserbaseSessionCreateParams::BrowserSettings::Context,
             extension_id: String,
             fingerprint: Stagehand::SessionStartParams::BrowserbaseSessionCreateParams::BrowserSettings::Fingerprint,
             log_session: bool,
+            os: Stagehand::Models::SessionStartParams::BrowserbaseSessionCreateParams::BrowserSettings::os,
             record_session: bool,
             solve_captchas: bool,
+            verified: bool,
             viewport: Stagehand::SessionStartParams::BrowserbaseSessionCreateParams::BrowserSettings::Viewport
           }
 
@@ -468,6 +472,14 @@ module Stagehand
 
           def block_ads=: (bool) -> bool
 
+          attr_reader captcha_image_selector: String?
+
+          def captcha_image_selector=: (String) -> String
+
+          attr_reader captcha_input_selector: String?
+
+          def captcha_input_selector=: (String) -> String
+
           attr_reader context: Stagehand::SessionStartParams::BrowserbaseSessionCreateParams::BrowserSettings::Context?
 
           def context=: (
@@ -488,6 +500,12 @@ module Stagehand
 
           def log_session=: (bool) -> bool
 
+          attr_reader os: Stagehand::Models::SessionStartParams::BrowserbaseSessionCreateParams::BrowserSettings::os?
+
+          def os=: (
+            Stagehand::Models::SessionStartParams::BrowserbaseSessionCreateParams::BrowserSettings::os
+          ) -> Stagehand::Models::SessionStartParams::BrowserbaseSessionCreateParams::BrowserSettings::os
+
           attr_reader record_session: bool?
 
           def record_session=: (bool) -> bool
@@ -496,6 +514,10 @@ module Stagehand
 
           def solve_captchas=: (bool) -> bool
 
+          attr_reader verified: bool?
+
+          def verified=: (bool) -> bool
+
           attr_reader viewport: Stagehand::SessionStartParams::BrowserbaseSessionCreateParams::BrowserSettings::Viewport?
 
           def viewport=: (
@@ -505,24 +527,32 @@ module Stagehand
           def initialize: (
             ?advanced_stealth: bool,
             ?block_ads: bool,
+            ?captcha_image_selector: String,
+            ?captcha_input_selector: String,
             ?context: Stagehand::SessionStartParams::BrowserbaseSessionCreateParams::BrowserSettings::Context,
             ?extension_id: String,
             ?fingerprint: Stagehand::SessionStartParams::BrowserbaseSessionCreateParams::BrowserSettings::Fingerprint,
             ?log_session: bool,
+            ?os: Stagehand::Models::SessionStartParams::BrowserbaseSessionCreateParams::BrowserSettings::os,
             ?record_session: bool,
             ?solve_captchas: bool,
+            ?verified: bool,
             ?viewport: Stagehand::SessionStartParams::BrowserbaseSessionCreateParams::BrowserSettings::Viewport
           ) -> void
 
           def to_hash: -> {
             advanced_stealth: bool,
             block_ads: bool,
+            captcha_image_selector: String,
+            captcha_input_selector: String,
             context: Stagehand::SessionStartParams::BrowserbaseSessionCreateParams::BrowserSettings::Context,
             extension_id: String,
             fingerprint: Stagehand::SessionStartParams::BrowserbaseSessionCreateParams::BrowserSettings::Fingerprint,
             log_session: bool,
+            os: Stagehand::Models::SessionStartParams::BrowserbaseSessionCreateParams::BrowserSettings::os,
             record_session: bool,
             solve_captchas: bool,
+            verified: bool,
             viewport: Stagehand::SessionStartParams::BrowserbaseSessionCreateParams::BrowserSettings::Viewport
           }
 
@@ -693,6 +723,20 @@ module Stagehand
             end
           end
 
+          type os = :windows | :mac | :linux | :mobile | :tablet
+
+          module Os
+            extend Stagehand::Internal::Type::Enum
+
+            WINDOWS: :windows
+            MAC: :mac
+            LINUX: :linux
+            MOBILE: :mobile
+            TABLET: :tablet
+
+            def self?.values: -> ::Array[Stagehand::Models::SessionStartParams::BrowserbaseSessionCreateParams::BrowserSettings::os]
+          end
+
           type viewport = { height: Float, width: Float }
 
           class Viewport < Stagehand::Internal::Type::BaseModel