diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 54c714b1d..7deae3380 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "1.5.3"
+  ".": "1.6.0"
 }
\ No newline at end of file
diff --git a/.stats.yml b/.stats.yml
index 107106630..a3290ea74 100644
--- a/.stats.yml
+++ b/.stats.yml
@@ -1,4 +1,4 @@
 configured_endpoints: 201
-openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/increase%2Fincrease-a027ea8bf72e85055306ceaf380c0311b8ed5e6e83962de0ccf48f62c85403fc.yml
-openapi_spec_hash: 4e35ead65a06ac0783945b2b213ce83c
+openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/increase%2Fincrease-930514b98f2a5e85e56fe454b7a1f2e16e1f0a4a4e2804b31acc3da98526f2ed.yml
+openapi_spec_hash: 8e35630e1ad9cfb1ac15ad87701f806f
 config_hash: 97774f946585cecb19181a1817870d0b
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 41b0715a4..c9aafdae9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## 1.6.0 (2025-07-01)
+
+Full Changelog: [v1.5.3...v1.6.0](https://github.com/Increase/increase-ruby/compare/v1.5.3...v1.6.0)
+
+### Features
+
+* **api:** api update ([f558750](https://github.com/Increase/increase-ruby/commit/f55875048421a837a8cd9cff86e163cbb6501c7a))
+
 ## 1.5.3 (2025-06-30)
 
 Full Changelog: [v1.5.2...v1.5.3](https://github.com/Increase/increase-ruby/compare/v1.5.2...v1.5.3)
diff --git a/Gemfile.lock b/Gemfile.lock
index f585a8d35..6c6ed6c29 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -11,7 +11,7 @@ GIT
 PATH
   remote: .
   specs:
-    increase (1.5.3)
+    increase (1.6.0)
       connection_pool
 
 GEM
diff --git a/README.md b/README.md
index 5d43cb27a..2de3f77f2 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", "~> 1.5.3"
+gem "increase", "~> 1.6.0"
 ```
 
 <!-- x-release-please-end -->
diff --git a/lib/increase/models/file.rb b/lib/increase/models/file.rb
index 56b2af024..031b835d5 100644
--- a/lib/increase/models/file.rb
+++ b/lib/increase/models/file.rb
@@ -195,6 +195,9 @@ module Purpose
         # Funding instructions.
         FUNDING_INSTRUCTIONS = :funding_instructions
 
+        # A Hold Harmless Letter.
+        HOLD_HARMLESS_LETTER = :hold_harmless_letter
+
         # @!method self.values
         #   @return [Array<Symbol>]
       end
diff --git a/lib/increase/models/file_list_params.rb b/lib/increase/models/file_list_params.rb
index c381d278e..788b266bd 100644
--- a/lib/increase/models/file_list_params.rb
+++ b/lib/increase/models/file_list_params.rb
@@ -197,6 +197,9 @@ module In
           # Funding instructions.
           FUNDING_INSTRUCTIONS = :funding_instructions
 
+          # A Hold Harmless Letter.
+          HOLD_HARMLESS_LETTER = :hold_harmless_letter
+
           # @!method self.values
           #   @return [Array<Symbol>]
         end
diff --git a/lib/increase/version.rb b/lib/increase/version.rb
index d30ee6ab3..808e8efc1 100644
--- a/lib/increase/version.rb
+++ b/lib/increase/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module Increase
-  VERSION = "1.5.3"
+  VERSION = "1.6.0"
 end
diff --git a/rbi/increase/models/file.rbi b/rbi/increase/models/file.rbi
index 91eb861bc..bc9c5eaf5 100644
--- a/rbi/increase/models/file.rbi
+++ b/rbi/increase/models/file.rbi
@@ -269,6 +269,10 @@ module Increase
         FUNDING_INSTRUCTIONS =
           T.let(:funding_instructions, Increase::File::Purpose::TaggedSymbol)
 
+        # A Hold Harmless Letter.
+        HOLD_HARMLESS_LETTER =
+          T.let(:hold_harmless_letter, Increase::File::Purpose::TaggedSymbol)
+
         sig do
           override.returns(T::Array[Increase::File::Purpose::TaggedSymbol])
         end
diff --git a/rbi/increase/models/file_list_params.rbi b/rbi/increase/models/file_list_params.rbi
index b06ab40e3..4144919ea 100644
--- a/rbi/increase/models/file_list_params.rbi
+++ b/rbi/increase/models/file_list_params.rbi
@@ -403,6 +403,13 @@ module Increase
               Increase::FileListParams::Purpose::In::TaggedSymbol
             )
 
+          # A Hold Harmless Letter.
+          HOLD_HARMLESS_LETTER =
+            T.let(
+              :hold_harmless_letter,
+              Increase::FileListParams::Purpose::In::TaggedSymbol
+            )
+
           sig do
             override.returns(
               T::Array[Increase::FileListParams::Purpose::In::TaggedSymbol]
diff --git a/sig/increase/models/file.rbs b/sig/increase/models/file.rbs
index 392cd5d00..08569f9e5 100644
--- a/sig/increase/models/file.rbs
+++ b/sig/increase/models/file.rbs
@@ -98,6 +98,7 @@ module Increase
         | :proof_of_authorization_request_submission
         | :account_verification_letter
         | :funding_instructions
+        | :hold_harmless_letter
 
       module Purpose
         extend Increase::Internal::Type::Enum
@@ -183,6 +184,9 @@ module Increase
         # Funding instructions.
         FUNDING_INSTRUCTIONS: :funding_instructions
 
+        # A Hold Harmless Letter.
+        HOLD_HARMLESS_LETTER: :hold_harmless_letter
+
         def self?.values: -> ::Array[Increase::Models::File::purpose]
       end
 
diff --git a/sig/increase/models/file_list_params.rbs b/sig/increase/models/file_list_params.rbs
index 04b0d770c..20dbbba91 100644
--- a/sig/increase/models/file_list_params.rbs
+++ b/sig/increase/models/file_list_params.rbs
@@ -137,6 +137,7 @@ module Increase
           | :proof_of_authorization_request_submission
           | :account_verification_letter
           | :funding_instructions
+          | :hold_harmless_letter
 
         module In
           extend Increase::Internal::Type::Enum
@@ -222,6 +223,9 @@ module Increase
           # Funding instructions.
           FUNDING_INSTRUCTIONS: :funding_instructions
 
+          # A Hold Harmless Letter.
+          HOLD_HARMLESS_LETTER: :hold_harmless_letter
+
           def self?.values: -> ::Array[Increase::Models::FileListParams::Purpose::in_]
         end
       end