diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index b9606709..2390bfeb 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "1.139.0"
+  ".": "1.140.0"
 }
\ No newline at end of file
diff --git a/.stats.yml b/.stats.yml
index e94fde2d..2cc58976 100644
--- a/.stats.yml
+++ b/.stats.yml
@@ -1,4 +1,4 @@
-configured_endpoints: 228
-openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/increase%2Fincrease-b6b193549e9c795e807b299e7161628dc1e504d43d6be27113b1f3a1e491914f.yml
-openapi_spec_hash: 9d0ff6cc1ec60a6772598cff20f8db1d
-config_hash: eb2035151c7b49c2f12caf55469b8f9a
+configured_endpoints: 229
+openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/increase%2Fincrease-a0eb4b9ef698e80be2fc9e995d6096b96de35e4985c8586e0773fa55a6b50943.yml
+openapi_spec_hash: a36c0bee01bf3af40ebcd7075308f170
+config_hash: ca1425272e17fa23d4466d33492334fa
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 91dacf99..8ad28b59 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## 1.140.0 (2025-11-12)
+
+Full Changelog: [v1.139.0...v1.140.0](https://github.com/Increase/increase-ruby/compare/v1.139.0...v1.140.0)
+
+### Features
+
+* **api:** api update ([ec8f079](https://github.com/Increase/increase-ruby/commit/ec8f0799545f42cf6c1ab2281669744f469514a8))
+
 ## 1.139.0 (2025-11-10)
 
 Full Changelog: [v1.138.0...v1.139.0](https://github.com/Increase/increase-ruby/compare/v1.138.0...v1.139.0)
diff --git a/Gemfile.lock b/Gemfile.lock
index e8533786..aab61656 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -11,7 +11,7 @@ GIT
 PATH
   remote: .
   specs:
-    increase (1.139.0)
+    increase (1.140.0)
       connection_pool
 
 GEM
diff --git a/README.md b/README.md
index 9b2e256d..d6f8c090 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,7 @@ To use this gem, install via Bundler by adding the following to your application
 <!-- x-release-please-start-version -->
 
 ```ruby
-gem "increase", "~> 1.139.0"
+gem "increase", "~> 1.140.0"
 ```
 
 <!-- x-release-please-end -->
diff --git a/lib/increase.rb b/lib/increase.rb
index bcbb1bfb..81c0754d 100644
--- a/lib/increase.rb
+++ b/lib/increase.rb
@@ -220,6 +220,7 @@
 require_relative "increase/models/inbound_fednow_transfer_list_params"
 require_relative "increase/models/inbound_fednow_transfer_retrieve_params"
 require_relative "increase/models/inbound_mail_item"
+require_relative "increase/models/inbound_mail_item_action_params"
 require_relative "increase/models/inbound_mail_item_list_params"
 require_relative "increase/models/inbound_mail_item_retrieve_params"
 require_relative "increase/models/inbound_real_time_payments_transfer"
diff --git a/lib/increase/models.rb b/lib/increase/models.rb
index e4d41659..ed60b0b0 100644
--- a/lib/increase/models.rb
+++ b/lib/increase/models.rb
@@ -376,6 +376,8 @@ module Increase
 
   InboundMailItem = Increase::Models::InboundMailItem
 
+  InboundMailItemActionParams = Increase::Models::InboundMailItemActionParams
+
   InboundMailItemListParams = Increase::Models::InboundMailItemListParams
 
   InboundMailItemRetrieveParams = Increase::Models::InboundMailItemRetrieveParams
diff --git a/lib/increase/models/inbound_mail_item_action_params.rb b/lib/increase/models/inbound_mail_item_action_params.rb
new file mode 100644
index 00000000..9295e2ec
--- /dev/null
+++ b/lib/increase/models/inbound_mail_item_action_params.rb
@@ -0,0 +1,61 @@
+# frozen_string_literal: true
+
+module Increase
+  module Models
+    # @see Increase::Resources::InboundMailItems#action
+    class InboundMailItemActionParams < Increase::Internal::Type::BaseModel
+      extend Increase::Internal::Type::RequestParameters::Converter
+      include Increase::Internal::Type::RequestParameters
+
+      # @!attribute checks
+      #   The actions to perform on the Inbound Mail Item.
+      #
+      #   @return [Array<Increase::Models::InboundMailItemActionParams::Check>]
+      required :checks, -> { Increase::Internal::Type::ArrayOf[Increase::InboundMailItemActionParams::Check] }
+
+      # @!method initialize(checks:, request_options: {})
+      #   @param checks [Array<Increase::Models::InboundMailItemActionParams::Check>] The actions to perform on the Inbound Mail Item.
+      #
+      #   @param request_options [Increase::RequestOptions, Hash{Symbol=>Object}]
+
+      class Check < Increase::Internal::Type::BaseModel
+        # @!attribute action
+        #   The action to perform on the Inbound Mail Item.
+        #
+        #   @return [Symbol, Increase::Models::InboundMailItemActionParams::Check::Action]
+        required :action, enum: -> { Increase::InboundMailItemActionParams::Check::Action }
+
+        # @!attribute account
+        #   The identifier of the Account to deposit the check into. If not provided, the
+        #   check will be deposited into the Account associated with the Lockbox.
+        #
+        #   @return [String, nil]
+        optional :account, String
+
+        # @!method initialize(action:, account: nil)
+        #   Some parameter documentations has been truncated, see
+        #   {Increase::Models::InboundMailItemActionParams::Check} for more details.
+        #
+        #   @param action [Symbol, Increase::Models::InboundMailItemActionParams::Check::Action] The action to perform on the Inbound Mail Item.
+        #
+        #   @param account [String] The identifier of the Account to deposit the check into. If not provided, the ch
+
+        # The action to perform on the Inbound Mail Item.
+        #
+        # @see Increase::Models::InboundMailItemActionParams::Check#action
+        module Action
+          extend Increase::Internal::Type::Enum
+
+          # The check will be deposited.
+          DEPOSIT = :deposit
+
+          # The check will be ignored.
+          IGNORE = :ignore
+
+          # @!method self.values
+          #   @return [Array<Symbol>]
+        end
+      end
+    end
+  end
+end
diff --git a/lib/increase/models/lockbox.rb b/lib/increase/models/lockbox.rb
index 017720ed..496ac8e9 100644
--- a/lib/increase/models/lockbox.rb
+++ b/lib/increase/models/lockbox.rb
@@ -161,6 +161,9 @@ module CheckDepositBehavior
         # Checks mailed to this Lockbox will not be deposited.
         DISABLED = :disabled
 
+        # Checks mailed to this Lockbox will be pending until actioned.
+        PEND_FOR_PROCESSING = :pend_for_processing
+
         # @!method self.values
         #   @return [Array<Symbol>]
       end
diff --git a/lib/increase/models/lockbox_update_params.rb b/lib/increase/models/lockbox_update_params.rb
index 526f23f2..536fccbc 100644
--- a/lib/increase/models/lockbox_update_params.rb
+++ b/lib/increase/models/lockbox_update_params.rb
@@ -44,6 +44,9 @@ module CheckDepositBehavior
         # Checks mailed to this Lockbox will not be deposited.
         DISABLED = :disabled
 
+        # Checks mailed to this Lockbox will be pending until actioned.
+        PEND_FOR_PROCESSING = :pend_for_processing
+
         # @!method self.values
         #   @return [Array<Symbol>]
       end
diff --git a/lib/increase/resources/inbound_mail_items.rb b/lib/increase/resources/inbound_mail_items.rb
index e3a0f1b5..a045f001 100644
--- a/lib/increase/resources/inbound_mail_items.rb
+++ b/lib/increase/resources/inbound_mail_items.rb
@@ -55,6 +55,30 @@ def list(params = {})
         )
       end
 
+      # Action a Inbound Mail Item
+      #
+      # @overload action(inbound_mail_item_id, checks:, request_options: {})
+      #
+      # @param inbound_mail_item_id [String] The identifier of the Inbound Mail Item to action.
+      #
+      # @param checks [Array<Increase::Models::InboundMailItemActionParams::Check>] The actions to perform on the Inbound Mail Item.
+      #
+      # @param request_options [Increase::RequestOptions, Hash{Symbol=>Object}, nil]
+      #
+      # @return [Increase::Models::InboundMailItem]
+      #
+      # @see Increase::Models::InboundMailItemActionParams
+      def action(inbound_mail_item_id, params)
+        parsed, options = Increase::InboundMailItemActionParams.dump_request(params)
+        @client.request(
+          method: :post,
+          path: ["inbound_mail_items/%1$s/action", inbound_mail_item_id],
+          body: parsed,
+          model: Increase::InboundMailItem,
+          options: options
+        )
+      end
+
       # @api private
       #
       # @param client [Increase::Client]
diff --git a/lib/increase/version.rb b/lib/increase/version.rb
index c67f29a4..aa4d432c 100644
--- a/lib/increase/version.rb
+++ b/lib/increase/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module Increase
-  VERSION = "1.139.0"
+  VERSION = "1.140.0"
 end
diff --git a/rbi/increase/models.rbi b/rbi/increase/models.rbi
index 24e802a2..d3f08fb1 100644
--- a/rbi/increase/models.rbi
+++ b/rbi/increase/models.rbi
@@ -380,6 +380,8 @@ module Increase
 
   InboundMailItem = Increase::Models::InboundMailItem
 
+  InboundMailItemActionParams = Increase::Models::InboundMailItemActionParams
+
   InboundMailItemListParams = Increase::Models::InboundMailItemListParams
 
   InboundMailItemRetrieveParams =
diff --git a/rbi/increase/models/inbound_mail_item_action_params.rbi b/rbi/increase/models/inbound_mail_item_action_params.rbi
new file mode 100644
index 00000000..d49b69ac
--- /dev/null
+++ b/rbi/increase/models/inbound_mail_item_action_params.rbi
@@ -0,0 +1,139 @@
+# typed: strong
+
+module Increase
+  module Models
+    class InboundMailItemActionParams < Increase::Internal::Type::BaseModel
+      extend Increase::Internal::Type::RequestParameters::Converter
+      include Increase::Internal::Type::RequestParameters
+
+      OrHash =
+        T.type_alias do
+          T.any(
+            Increase::InboundMailItemActionParams,
+            Increase::Internal::AnyHash
+          )
+        end
+
+      # The actions to perform on the Inbound Mail Item.
+      sig { returns(T::Array[Increase::InboundMailItemActionParams::Check]) }
+      attr_accessor :checks
+
+      sig do
+        params(
+          checks:
+            T::Array[Increase::InboundMailItemActionParams::Check::OrHash],
+          request_options: Increase::RequestOptions::OrHash
+        ).returns(T.attached_class)
+      end
+      def self.new(
+        # The actions to perform on the Inbound Mail Item.
+        checks:,
+        request_options: {}
+      )
+      end
+
+      sig do
+        override.returns(
+          {
+            checks: T::Array[Increase::InboundMailItemActionParams::Check],
+            request_options: Increase::RequestOptions
+          }
+        )
+      end
+      def to_hash
+      end
+
+      class Check < Increase::Internal::Type::BaseModel
+        OrHash =
+          T.type_alias do
+            T.any(
+              Increase::InboundMailItemActionParams::Check,
+              Increase::Internal::AnyHash
+            )
+          end
+
+        # The action to perform on the Inbound Mail Item.
+        sig do
+          returns(
+            Increase::InboundMailItemActionParams::Check::Action::OrSymbol
+          )
+        end
+        attr_accessor :action
+
+        # The identifier of the Account to deposit the check into. If not provided, the
+        # check will be deposited into the Account associated with the Lockbox.
+        sig { returns(T.nilable(String)) }
+        attr_reader :account
+
+        sig { params(account: String).void }
+        attr_writer :account
+
+        sig do
+          params(
+            action:
+              Increase::InboundMailItemActionParams::Check::Action::OrSymbol,
+            account: String
+          ).returns(T.attached_class)
+        end
+        def self.new(
+          # The action to perform on the Inbound Mail Item.
+          action:,
+          # The identifier of the Account to deposit the check into. If not provided, the
+          # check will be deposited into the Account associated with the Lockbox.
+          account: nil
+        )
+        end
+
+        sig do
+          override.returns(
+            {
+              action:
+                Increase::InboundMailItemActionParams::Check::Action::OrSymbol,
+              account: String
+            }
+          )
+        end
+        def to_hash
+        end
+
+        # The action to perform on the Inbound Mail Item.
+        module Action
+          extend Increase::Internal::Type::Enum
+
+          TaggedSymbol =
+            T.type_alias do
+              T.all(
+                Symbol,
+                Increase::InboundMailItemActionParams::Check::Action
+              )
+            end
+          OrSymbol = T.type_alias { T.any(Symbol, String) }
+
+          # The check will be deposited.
+          DEPOSIT =
+            T.let(
+              :deposit,
+              Increase::InboundMailItemActionParams::Check::Action::TaggedSymbol
+            )
+
+          # The check will be ignored.
+          IGNORE =
+            T.let(
+              :ignore,
+              Increase::InboundMailItemActionParams::Check::Action::TaggedSymbol
+            )
+
+          sig do
+            override.returns(
+              T::Array[
+                Increase::InboundMailItemActionParams::Check::Action::TaggedSymbol
+              ]
+            )
+          end
+          def self.values
+          end
+        end
+      end
+    end
+  end
+end
diff --git a/rbi/increase/models/lockbox.rbi b/rbi/increase/models/lockbox.rbi
index 3455169c..d11fc4be 100644
--- a/rbi/increase/models/lockbox.rbi
+++ b/rbi/increase/models/lockbox.rbi
@@ -214,6 +214,13 @@ module Increase
             Increase::Lockbox::CheckDepositBehavior::TaggedSymbol
           )
 
+        # Checks mailed to this Lockbox will be pending until actioned.
+        PEND_FOR_PROCESSING =
+          T.let(
+            :pend_for_processing,
+            Increase::Lockbox::CheckDepositBehavior::TaggedSymbol
+          )
+
         sig do
           override.returns(
             T::Array[Increase::Lockbox::CheckDepositBehavior::TaggedSymbol]
diff --git a/rbi/increase/models/lockbox_update_params.rbi b/rbi/increase/models/lockbox_update_params.rbi
index e7cc76cf..9f0d9e29 100644
--- a/rbi/increase/models/lockbox_update_params.rbi
+++ b/rbi/increase/models/lockbox_update_params.rbi
@@ -101,6 +101,13 @@ module Increase
             Increase::LockboxUpdateParams::CheckDepositBehavior::TaggedSymbol
           )
 
+        # Checks mailed to this Lockbox will be pending until actioned.
+        PEND_FOR_PROCESSING =
+          T.let(
+            :pend_for_processing,
+            Increase::LockboxUpdateParams::CheckDepositBehavior::TaggedSymbol
+          )
+
         sig do
           override.returns(
             T::Array[
diff --git a/rbi/increase/resources/inbound_mail_items.rbi b/rbi/increase/resources/inbound_mail_items.rbi
index ef0a890c..6d6736ee 100644
--- a/rbi/increase/resources/inbound_mail_items.rbi
+++ b/rbi/increase/resources/inbound_mail_items.rbi
@@ -40,6 +40,24 @@ module Increase
       )
       end
 
+      # Action a Inbound Mail Item
+      sig do
+        params(
+          inbound_mail_item_id: String,
+          checks:
+            T::Array[Increase::InboundMailItemActionParams::Check::OrHash],
+          request_options: Increase::RequestOptions::OrHash
+        ).returns(Increase::InboundMailItem)
+      end
+      def action(
+        # The identifier of the Inbound Mail Item to action.
+        inbound_mail_item_id,
+        # The actions to perform on the Inbound Mail Item.
+        checks:,
+        request_options: {}
+      )
+      end
+
       # @api private
       sig { params(client: Increase::Client).returns(T.attached_class) }
       def self.new(client:)
diff --git a/sig/increase/models.rbs b/sig/increase/models.rbs
index 6e77b08a..e3c1204e 100644
--- a/sig/increase/models.rbs
+++ b/sig/increase/models.rbs
@@ -335,6 +335,8 @@ module Increase
 
   class InboundMailItem = Increase::Models::InboundMailItem
 
+  class InboundMailItemActionParams = Increase::Models::InboundMailItemActionParams
+
   class InboundMailItemListParams = Increase::Models::InboundMailItemListParams
 
   class InboundMailItemRetrieveParams = Increase::Models::InboundMailItemRetrieveParams
diff --git a/sig/increase/models/inbound_mail_item_action_params.rbs b/sig/increase/models/inbound_mail_item_action_params.rbs
new file mode 100644
index 00000000..d125aca4
--- /dev/null
+++ b/sig/increase/models/inbound_mail_item_action_params.rbs
@@ -0,0 +1,62 @@
+module Increase
+  module Models
+    type inbound_mail_item_action_params =
+      { checks: ::Array[Increase::InboundMailItemActionParams::Check] }
+      & Increase::Internal::Type::request_parameters
+
+    class InboundMailItemActionParams < Increase::Internal::Type::BaseModel
+      extend Increase::Internal::Type::RequestParameters::Converter
+      include Increase::Internal::Type::RequestParameters
+
+      attr_accessor checks: ::Array[Increase::InboundMailItemActionParams::Check]
+
+      def initialize: (
+        checks: ::Array[Increase::InboundMailItemActionParams::Check],
+        ?request_options: Increase::request_opts
+      ) -> void
+
+      def to_hash: -> {
+        checks: ::Array[Increase::InboundMailItemActionParams::Check],
+        request_options: Increase::RequestOptions
+      }
+
+      type check =
+        {
+          action: Increase::Models::InboundMailItemActionParams::Check::action,
+          account: String
+        }
+
+      class Check < Increase::Internal::Type::BaseModel
+        attr_accessor action: Increase::Models::InboundMailItemActionParams::Check::action
+
+        attr_reader account: String?
+
+        def account=: (String) -> String
+
+        def initialize: (
+          action: Increase::Models::InboundMailItemActionParams::Check::action,
+          ?account: String
+        ) -> void
+
+        def to_hash: -> {
+          action: Increase::Models::InboundMailItemActionParams::Check::action,
+          account: String
+        }
+
+        type action = :deposit | :ignore
+
+        module Action
+          extend Increase::Internal::Type::Enum
+
+          # The check will be deposited.
+          DEPOSIT: :deposit
+
+          # The check will be ignored.
+          IGNORE: :ignore
+
+          def self?.values: -> ::Array[Increase::Models::InboundMailItemActionParams::Check::action]
+        end
+      end
+    end
+  end
+end
diff --git a/sig/increase/models/lockbox.rbs b/sig/increase/models/lockbox.rbs
index 99638a55..857f844c 100644
--- a/sig/increase/models/lockbox.rbs
+++ b/sig/increase/models/lockbox.rbs
@@ -98,7 +98,7 @@ module Increase
         }
       end
 
-      type check_deposit_behavior = :enabled | :disabled
+      type check_deposit_behavior = :enabled | :disabled | :pend_for_processing
 
       module CheckDepositBehavior
         extend Increase::Internal::Type::Enum
@@ -109,6 +109,9 @@ module Increase
         # Checks mailed to this Lockbox will not be deposited.
         DISABLED: :disabled
 
+        # Checks mailed to this Lockbox will be pending until actioned.
+        PEND_FOR_PROCESSING: :pend_for_processing
+
         def self?.values: -> ::Array[Increase::Models::Lockbox::check_deposit_behavior]
       end
 
diff --git a/sig/increase/models/lockbox_update_params.rbs b/sig/increase/models/lockbox_update_params.rbs
index d52ebcb0..01fcc52c 100644
--- a/sig/increase/models/lockbox_update_params.rbs
+++ b/sig/increase/models/lockbox_update_params.rbs
@@ -40,7 +40,7 @@ module Increase
         request_options: Increase::RequestOptions
       }
 
-      type check_deposit_behavior = :enabled | :disabled
+      type check_deposit_behavior = :enabled | :disabled | :pend_for_processing
 
       module CheckDepositBehavior
         extend Increase::Internal::Type::Enum
@@ -51,6 +51,9 @@ module Increase
         # Checks mailed to this Lockbox will not be deposited.
         DISABLED: :disabled
 
+        # Checks mailed to this Lockbox will be pending until actioned.
+        PEND_FOR_PROCESSING: :pend_for_processing
+
         def self?.values: -> ::Array[Increase::Models::LockboxUpdateParams::check_deposit_behavior]
       end
     end
diff --git a/sig/increase/resources/inbound_mail_items.rbs b/sig/increase/resources/inbound_mail_items.rbs
index 8ac65623..fecac54c 100644
--- a/sig/increase/resources/inbound_mail_items.rbs
+++ b/sig/increase/resources/inbound_mail_items.rbs
@@ -14,6 +14,12 @@ module Increase
         ?request_options: Increase::request_opts
       ) -> Increase::Internal::Page[Increase::InboundMailItem]
 
+      def action: (
+        String inbound_mail_item_id,
+        checks: ::Array[Increase::InboundMailItemActionParams::Check],
+        ?request_options: Increase::request_opts
+      ) -> Increase::InboundMailItem
+
       def initialize: (client: Increase::Client) -> void
     end
   end
diff --git a/test/increase/resources/inbound_mail_items_test.rb b/test/increase/resources/inbound_mail_items_test.rb
index 336ce0a4..e5aa6a21 100644
--- a/test/increase/resources/inbound_mail_items_test.rb
+++ b/test/increase/resources/inbound_mail_items_test.rb
@@ -53,4 +53,30 @@ def test_list
       }
     end
   end
+
+  def test_action_required_params
+    response =
+      @increase.inbound_mail_items.action(
+        "inbound_mail_item_q6rrg7mmqpplx80zceev",
+        checks: [{action: :deposit}, {action: :ignore}]
+      )
+
+    assert_pattern do
+      response => Increase::InboundMailItem
+    end
+
+    assert_pattern do
+      response => {
+        id: String,
+        checks: ^(Increase::Internal::Type::ArrayOf[Increase::InboundMailItem::Check]),
+        created_at: Time,
+        file_id: String,
+        lockbox_id: String | nil,
+        recipient_name: String | nil,
+        rejection_reason: Increase::InboundMailItem::RejectionReason | nil,
+        status: Increase::InboundMailItem::Status,
+        type: Increase::InboundMailItem::Type
+      }
+    end
+  end
 end