Fix Ruby 3.1 compatibility with httparty/multi_xml

httparty's unbounded dependency on multi_xml was resolving to 0.9.1, which requires Ruby >= 3.2. This broke CI on Ruby 3.1.7. Pin multi_xml to 0.7.1 to maintain compatibility.

Also reverted bundler bump to ~> 4.0 (from ~> 2.5) after CI failed to resolve the newer major version; keeping ~> 2.5 ensures stable dependency resolution.

Author: bradpotts

CHANGELOG.md

@@ -37,7 +37,12 @@ Change type: additive (initial extraction)
 
 - Bumped `httparty` to `~> 0.24.0` (from `~> 0.22.0`) and `rubocop-rake` to
   `~> 0.7.0` (from `~> 0.6.0`) to track current RubyGems releases.
-- Bumped the development `bundler` constraint to `~> 4.0` (from `~> 2.5`).
+- Pinned `multi_xml` to `0.7.1` in the `Gemfile`: `httparty`'s dependency on
+  `multi_xml` is unbounded, and `multi_xml >= 0.7.2` requires Ruby >= 3.2,
+  which broke CI (still on Ruby 3.1.7) after the `httparty` bump. The pin
+  keeps the resolved dependency tree within `required_ruby_version` (>= 3.1.0).
+- Reverted an attempted development `bundler` bump to `~> 4.0`; kept `~> 2.5`
+  after CI failed to resolve/install the newer major version.
 
 ## [0.1.0] - 2026-07-11
 

Gemfile

@@ -3,8 +3,12 @@
 source 'https://rubygems.org'
 gemspec
 
+# multi_xml >= 0.7.2 drops Ruby 3.1 support; httparty's dependency on multi_xml
+# is unbounded, so pin it directly to stay compatible with required_ruby_version.
+gem 'multi_xml', '0.7.1'
+
 group :development, :test do
-  gem 'bundler', '~> 4.0'
+  gem 'bundler', '~> 2.5'
   gem 'rake', '~> 13.2'
   gem 'rspec', '~> 3.13'
   gem 'rubocop', '~> 1.64', require: false

Gemfile.lock

@@ -9,7 +9,7 @@ GEM
   remote: https://rubygems.org/
   specs:
     ast (2.4.3)
-    bigdecimal (4.1.2)
+    bigdecimal (3.3.1)
     csv (3.3.5)
     diff-lcs (1.6.2)
     docile (1.4.1)
@@ -21,8 +21,8 @@ GEM
     language_server-protocol (3.17.0.6)
     lint_roller (1.1.0)
     mini_mime (1.1.5)
-    multi_xml (0.9.1)
-      bigdecimal (>= 3.1, < 5)
+    multi_xml (0.7.1)
+      bigdecimal (~> 3.1)
     oj (3.17.3)
       bigdecimal (>= 3.0)
       ostruct (>= 0.2)
@@ -90,7 +90,8 @@ PLATFORMS
   x86_64-linux
 
 DEPENDENCIES
-  bundler (~> 4.0)
+  bundler (~> 2.5)
+  multi_xml (= 0.7.1)
   rake (~> 13.2)
   rspec (~> 3.13)
   rubocop (~> 1.64)
@@ -101,4 +102,4 @@ DEPENDENCIES
   simplecov (~> 0.22.0)
 
 BUNDLED WITH
-  4.0.16
+   2.5.23