diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f5772e6..43f4d60 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,13 +14,19 @@ jobs:
       fail-fast: false
       matrix:
         ruby-version: [2.7, "3.0", 3.1, 3.2]
-
+        bundler-version: [2.4.20, 2.5.1]
+        exclude:
+          - ruby-version: 2.7
+            bundler-version: 2.5.1
+    env:
+      BUNDLER_VERSION: ${{ matrix.bundler-version }}
     steps:
       - uses: actions/checkout@v3
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby-version }}
+          bundler: ${{ matrix.bundler-version }}
           bundler-cache: true
       - name: Run tests
         run: bin/rspec
@@ -33,7 +39,7 @@ jobs:
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 2.7
+          ruby-version: "3.0"
           bundler-cache: true
       - name: Run RuboCop
         run: bin/rubocop
diff --git a/Gemfile.lock b/Gemfile.lock
index cb7d5bc..587f2c8 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,8 +1,8 @@
 PATH
   remote: .
   specs:
-    bundler-multilock (1.2.0)
-      bundler (~> 2.4.19)
+    bundler-multilock (1.2.1)
+      bundler (>= 2.4.19, < 2.6)
 
 GEM
   remote: https://rubygems.org/
@@ -98,4 +98,4 @@ DEPENDENCIES
   rubocop-rspec (~> 2.24)
 
 BUNDLED WITH
-   2.4.20
+   2.5.1
diff --git a/bundler-multilock.gemspec b/bundler-multilock.gemspec
index 7dc096a..cdf70db 100644
--- a/bundler-multilock.gemspec
+++ b/bundler-multilock.gemspec
@@ -16,7 +16,7 @@ Gem::Specification.new do |spec|
 
   spec.required_ruby_version = ">= 2.7"
 
-  spec.add_dependency "bundler", "~> 2.4.19"
+  spec.add_dependency "bundler", ">= 2.4.19", "< 2.6"
 
   spec.add_development_dependency "debug", "~> 1.8"
   spec.add_development_dependency "rake", "~> 13.0"
diff --git a/lib/bundler/multilock/lockfile_generator.rb b/lib/bundler/multilock/lockfile_generator.rb
index 3e7ba4e..7f8011f 100644
--- a/lib/bundler/multilock/lockfile_generator.rb
+++ b/lib/bundler/multilock/lockfile_generator.rb
@@ -32,6 +32,10 @@ def dependencies
         def locked_ruby_version
           ruby_version
         end
+
+        def locked_checksums
+          checksums
+        end
       end
 
       private_constant :LockfileAdapter
diff --git a/lib/bundler/multilock/version.rb b/lib/bundler/multilock/version.rb
index 4fd5042..378039a 100644
--- a/lib/bundler/multilock/version.rb
+++ b/lib/bundler/multilock/version.rb
@@ -2,6 +2,6 @@
 
 module Bundler
   module Multilock
-    VERSION = "1.2.0"
+    VERSION = "1.2.1"
   end
 end
diff --git a/spec/bundler/multilock_spec.rb b/spec/bundler/multilock_spec.rb
index ee1061f..6203dac 100644
--- a/spec/bundler/multilock_spec.rb
+++ b/spec/bundler/multilock_spec.rb
@@ -723,6 +723,7 @@
 
       lockfile("alt") {}
     RUBY
+      invoke_bundler("config set --local force_ruby_platform true") # workaround for https://github.com/rubygems/rubygems/issues/7304
       invoke_bundler("install")
 
       write_gemfile(<<~RUBY)