diff --git a/.github/workflows/Specs.yml b/.github/workflows/Specs.yml
index ca4a526a..e20d04cf 100644
--- a/.github/workflows/Specs.yml
+++ b/.github/workflows/Specs.yml
@@ -14,7 +14,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: ['2.7', '3.0', '3.1', '3.2', '3.3']
+        ruby: ['2.7', '3.0', '3.1', '3.2', '3.3', '3.4']
         os: [ubuntu-24.04]
         include:
           - os: macos-14
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 59d65db1..c5c7f5e3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,19 @@
 * None.  
 
 
+## 1.28.1 (2026-07-06)
+
+##### Enhancements
+
+* None.  
+
+##### Bug Fixes
+
+* Fix `cannot load such file -- kconv`, `cannot load such file -- base64` crash when running on Ruby 3.4.  
+  [Eric Amorde](https://github.com/amorde)
+  [#1046](https://github.com/CocoaPods/Xcodeproj/pull/1046)
+
+
 ## 1.28.0 (2026-07-06)
 
 ##### Enhancements
diff --git a/Gemfile.lock b/Gemfile.lock
index 6050ce9f..8a6aa321 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -14,12 +14,14 @@ GIT
 PATH
   remote: .
   specs:
-    xcodeproj (1.28.0)
+    xcodeproj (1.28.1)
       CFPropertyList (>= 2.3.3, < 4.0)
       atomos (~> 0.1.3)
+      base64
       claide (>= 1.0.2, < 2.0)
       colored2 (~> 3.1)
       nanaimo (~> 0.4.0)
+      nkf
       rexml (>= 3.3.6, < 4.0)
 
 GEM
@@ -31,6 +33,7 @@ GEM
     ast (2.4.3)
     atomos (0.1.3)
     bacon (1.2.0)
+    base64 (0.3.0)
     claide-plugins (0.9.2)
       cork
       nap
@@ -75,6 +78,7 @@ GEM
     multipart-post (2.1.1)
     nanaimo (0.4.0)
     nap (1.1.0)
+    nkf (0.3.0)
     notify (0.5.2)
     octokit (4.21.0)
       faraday (>= 0.9)
diff --git a/lib/xcodeproj/gem_version.rb b/lib/xcodeproj/gem_version.rb
index 994fe8b0..0166a3f5 100644
--- a/lib/xcodeproj/gem_version.rb
+++ b/lib/xcodeproj/gem_version.rb
@@ -1,5 +1,5 @@
 module Xcodeproj
   # The version of the xcodeproj gem.
   #
-  VERSION = '1.28.0'.freeze unless defined? Xcodeproj::VERSION
+  VERSION = '1.28.1'.freeze unless defined? Xcodeproj::VERSION
 end
diff --git a/spec/project/object_spec.rb b/spec/project/object_spec.rb
index 3b50746e..f38fed24 100644
--- a/spec/project/object_spec.rb
+++ b/spec/project/object_spec.rb
@@ -158,10 +158,18 @@ module ProjectSpecs
       end
 
       it 'warns if it encounters an unknown attribute in a plist' do
-        UI.expects(:warn).with "[!] Xcodeproj doesn't know about the following " \
+        if Gem::Requirement.new('>= 3.4.0').satisfied_by?(Gem::Version.new(RUBY_VERSION))
+          UI.expects(:warn).with "[!] Xcodeproj doesn't know about the following " \
+                                 "attributes {\"unknown_attribute\" => \"might be a reference\"} for the 'PBXFileReference' isa." \
+                                 "\nIf this attribute was generated by Xcode please file " \
+                                 'an issue: https://github.com/CocoaPods/Xcodeproj/issues/new'
+        else
+          UI.expects(:warn).with "[!] Xcodeproj doesn't know about the following " \
                                "attributes {\"unknown_attribute\"=>\"might be a reference\"} for the 'PBXFileReference' isa." \
                                "\nIf this attribute was generated by Xcode please file " \
                                'an issue: https://github.com/CocoaPods/Xcodeproj/issues/new'
+        end
+
         @objects_by_uuid_plist[@object.uuid]['unknown_attribute'] = 'might be a reference'
         @object.configure_with_plist(@objects_by_uuid_plist)
       end
diff --git a/xcodeproj.gemspec b/xcodeproj.gemspec
index a956c63b..71ddf49c 100644
--- a/xcodeproj.gemspec
+++ b/xcodeproj.gemspec
@@ -27,6 +27,8 @@ Gem::Specification.new do |s|
   s.add_runtime_dependency 'colored2',       '~> 3.1'
   s.add_runtime_dependency 'nanaimo',        '~> 0.4.0'
   s.add_runtime_dependency 'rexml',          '>= 3.3.6', '< 4.0'
+  s.add_runtime_dependency 'nkf' # required for older CFPropertyList versions on Ruby 3.4
+  s.add_runtime_dependency 'base64' # required for older CFPropertyList versions on Ruby 3.4
 
   ## Make sure you can build the gem on older versions of RubyGems too:
   s.rubygems_version = '1.6.2'