diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e288cc46c..03170d056 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,7 +15,7 @@ jobs:
         uses: ruby/setup-ruby@v1
         with:
           bundler-cache: true
-          rubygems: 3.5.23
+          rubygems: 3.6.1
       - name: Run type check
         run: bin/typecheck
       - name: Lint Ruby files
@@ -36,6 +36,7 @@ jobs:
       matrix:
         ruby: ["3.1", "3.2", "3.3", "head"]
         rails: ["7.0", "current", "main"]
+        rubygems: ["3.6.1"]
         exclude:
           - ruby: "3.1"
             rails: "main"
@@ -44,6 +45,8 @@ jobs:
             experimental: true
           - ruby: "head"
             experimental: true
+          - ruby: "3.3"
+            rubygems: "3.5.23"
     name: Ruby ${{ matrix.ruby }} - Rails ${{ matrix.rails }}
     env:
       RAILS_VERSION: ${{ matrix.rails }}
@@ -63,7 +66,7 @@ jobs:
         with:
           ruby-version: ${{ matrix.ruby }}
           bundler-cache: true
-          rubygems: 3.5.23
+          rubygems: ${{  matrix.rubygems }}
       - name: Run tests
         run: bin/test
         continue-on-error: ${{ !!matrix.experimental }}
diff --git a/Gemfile.lock b/Gemfile.lock
index f7087e409..7d72a4ca0 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -412,4 +412,4 @@ DEPENDENCIES
   xpath
 
 BUNDLED WITH
-   2.5.23
+   2.6.1
diff --git a/lib/tapioca/gemfile.rb b/lib/tapioca/gemfile.rb
index db67241e5..dd49b076d 100644
--- a/lib/tapioca/gemfile.rb
+++ b/lib/tapioca/gemfile.rb
@@ -67,14 +67,23 @@ def load_dependencies
     sig { returns([T::Enumerable[Spec], T::Array[String]]) }
     def materialize_deps
       deps = definition.locked_gems.dependencies.except(*@excluded_gems).values
-      materialized_dependencies = definition.resolve.materialize(deps)
-      missing_spec_names = materialized_dependencies.missing_specs.map(&:name).to_set
-      missing_specs = materialized_dependencies.missing_specs.map do |spec|
-        "#{spec.name} (#{spec.version})"
-      end
-      materialized_dependencies = materialized_dependencies.to_a.reject do |spec|
-        missing_spec_names.include?(spec.name)
+      resolve = definition.resolve
+      materialized_dependencies = resolve.materialize(deps)
+
+      if Bundler::VERSION >= "2.6.0"
+        missing_specs = resolve.missing_specs.map do |spec|
+          "#{spec.name} (#{spec.version})"
+        end
+      else
+        missing_spec_names = materialized_dependencies.missing_specs.map(&:name).to_set
+        missing_specs = materialized_dependencies.missing_specs.map do |spec|
+          "#{spec.name} (#{spec.version})"
+        end
+        materialized_dependencies = materialized_dependencies.to_a.reject do |spec|
+          missing_spec_names.include?(spec.name)
+        end
       end
+
       [materialized_dependencies, missing_specs]
     end