diff --git a/bundler/lib/dependabot/bundler/file_fetcher.rb b/bundler/lib/dependabot/bundler/file_fetcher.rb
index b1ba09cf3e6..bcbd18add95 100644
--- a/bundler/lib/dependabot/bundler/file_fetcher.rb
+++ b/bundler/lib/dependabot/bundler/file_fetcher.rb
@@ -45,6 +45,7 @@ def fetch_files
         fetched_files += child_gemfiles
         fetched_files += gemspecs
         fetched_files << ruby_version_file if ruby_version_file
+        fetched_files << tool_versions_file if tool_versions_file
         fetched_files += path_gemspecs
         fetched_files += require_relative_files(fetched_files)
 
@@ -100,9 +101,13 @@ def gemspec_directories
       def ruby_version_file
         return unless gemfile
 
-        @ruby_version_file ||=
-          fetch_file_if_present(".ruby-version")
-          &.tap { |f| f.support_file = true }
+        @ruby_version_file ||= fetch_support_file(".ruby-version")
+      end
+
+      def tool_versions_file
+        return unless gemfile
+
+        @tool_versions_file ||= fetch_support_file(".tool-versions")
       end
 
       def path_gemspecs
diff --git a/bundler/lib/dependabot/bundler/file_parser.rb b/bundler/lib/dependabot/bundler/file_parser.rb
index bc1b5333a25..e71df450bf6 100644
--- a/bundler/lib/dependabot/bundler/file_parser.rb
+++ b/bundler/lib/dependabot/bundler/file_parser.rb
@@ -245,10 +245,10 @@ def evaled_gemfiles
           .reject { |f| f.name.end_with?(".gemspec") }
           .reject { |f| f.name.end_with?(".specification") }
           .reject { |f| f.name.end_with?(".lock") }
-          .reject { |f| f.name.end_with?(".ruby-version") }
           .reject { |f| f.name == "Gemfile" }
           .reject { |f| f.name == "gems.rb" }
           .reject { |f| f.name == "gems.locked" }
+          .reject(&:support_file?)
       end
 
       def lockfile
diff --git a/bundler/lib/dependabot/bundler/file_parser/file_preparer.rb b/bundler/lib/dependabot/bundler/file_parser/file_preparer.rb
index b8d21c1a36c..9545646b51b 100644
--- a/bundler/lib/dependabot/bundler/file_parser/file_preparer.rb
+++ b/bundler/lib/dependabot/bundler/file_parser/file_preparer.rb
@@ -28,6 +28,7 @@ def prepared_dependency_files
             *evaled_gemfiles,
             lockfile,
             ruby_version_file,
+            tool_versions_file,
             *imported_ruby_files,
             *specification_files
           ].compact
@@ -47,10 +48,10 @@ def evaled_gemfiles
             .reject { |f| f.name.end_with?(".gemspec") }
             .reject { |f| f.name.end_with?(".specification") }
             .reject { |f| f.name.end_with?(".lock") }
-            .reject { |f| f.name.end_with?(".ruby-version") }
             .reject { |f| f.name == "Gemfile" }
             .reject { |f| f.name == "gems.rb" }
             .reject { |f| f.name == "gems.locked" }
+            .reject(&:support_file?)
         end
 
         def specification_files
@@ -70,6 +71,10 @@ def ruby_version_file
           dependency_files.find { |f| f.name == ".ruby-version" }
         end
 
+        def tool_versions_file
+          dependency_files.find { |f| f.name == ".tool-versions" }
+        end
+
         def imported_ruby_files
           dependency_files
             .select { |f| f.name.end_with?(".rb") }
diff --git a/bundler/lib/dependabot/bundler/file_updater.rb b/bundler/lib/dependabot/bundler/file_updater.rb
index b6fdaa7b0a7..056566cee7e 100644
--- a/bundler/lib/dependabot/bundler/file_updater.rb
+++ b/bundler/lib/dependabot/bundler/file_updater.rb
@@ -127,10 +127,10 @@ def evaled_gemfiles
           .reject { |f| f.name.end_with?(".gemspec") }
           .reject { |f| f.name.end_with?(".specification") }
           .reject { |f| f.name.end_with?(".lock") }
-          .reject { |f| f.name.end_with?(".ruby-version") }
           .reject { |f| f.name == "Gemfile" }
           .reject { |f| f.name == "gems.rb" }
           .reject { |f| f.name == "gems.locked" }
+          .reject(&:support_file?)
       end
 
       def updated_gemfile_content(file)
diff --git a/bundler/lib/dependabot/bundler/file_updater/lockfile_updater.rb b/bundler/lib/dependabot/bundler/file_updater/lockfile_updater.rb
index 1fb2984905f..12831f64456 100644
--- a/bundler/lib/dependabot/bundler/file_updater/lockfile_updater.rb
+++ b/bundler/lib/dependabot/bundler/file_updater/lockfile_updater.rb
@@ -96,6 +96,7 @@ def write_temporary_dependency_files
 
           write_gemspecs(top_level_gemspecs)
           write_ruby_version_file
+          write_tool_versions_file
           write_gemspecs(path_gemspecs)
           write_specification_files
           write_imported_ruby_files
@@ -115,6 +116,14 @@ def write_ruby_version_file
           File.write(path, ruby_version_file.content)
         end
 
+        def write_tool_versions_file
+          return unless tool_versions_file
+
+          path = tool_versions_file.name
+          FileUtils.mkdir_p(Pathname.new(path).dirname)
+          File.write(path, tool_versions_file.content)
+        end
+
         def write_gemspecs(files)
           files.each do |file|
             path = file.name
@@ -160,6 +169,10 @@ def ruby_version_file
           dependency_files.find { |f| f.name == ".ruby-version" }
         end
 
+        def tool_versions_file
+          dependency_files.find { |f| f.name == ".tool-versions" }
+        end
+
         def post_process_lockfile(lockfile_body)
           lockfile_body = reorder_git_dependencies(lockfile_body)
           replace_lockfile_ending(lockfile_body)
@@ -269,7 +282,6 @@ def evaled_gemfiles
             .reject { |f| f.name.end_with?(".gemspec") }
             .reject { |f| f.name.end_with?(".specification") }
             .reject { |f| f.name.end_with?(".lock") }
-            .reject { |f| f.name.end_with?(".ruby-version") }
             .reject { |f| f.name == "Gemfile" }
             .reject { |f| f.name == "gems.rb" }
             .reject { |f| f.name == "gems.locked" }
diff --git a/bundler/lib/dependabot/bundler/update_checker/file_preparer.rb b/bundler/lib/dependabot/bundler/update_checker/file_preparer.rb
index 04a9c93b406..929a2f3de6a 100644
--- a/bundler/lib/dependabot/bundler/update_checker/file_preparer.rb
+++ b/bundler/lib/dependabot/bundler/update_checker/file_preparer.rb
@@ -94,6 +94,7 @@ def prepared_dependency_files
           files += [
             lockfile,
             ruby_version_file,
+            tool_versions_file,
             *imported_ruby_files,
             *specification_files
           ].compact
@@ -130,10 +131,10 @@ def evaled_gemfiles
             .reject { |f| f.name.end_with?(".gemspec") }
             .reject { |f| f.name.end_with?(".specification") }
             .reject { |f| f.name.end_with?(".lock") }
-            .reject { |f| f.name.end_with?(".ruby-version") }
             .reject { |f| f.name == "Gemfile" }
             .reject { |f| f.name == "gems.rb" }
             .reject { |f| f.name == "gems.locked" }
+            .reject(&:support_file?)
         end
 
         def lockfile
@@ -154,6 +155,10 @@ def ruby_version_file
           dependency_files.find { |f| f.name == ".ruby-version" }
         end
 
+        def tool_versions_file
+          dependency_files.find { |f| f.name == ".tool-versions" }
+        end
+
         def path_gemspecs
           all = dependency_files.select { |f| f.name.end_with?(".gemspec") }
           all - top_level_gemspecs
diff --git a/bundler/spec/dependabot/bundler/file_fetcher_spec.rb b/bundler/spec/dependabot/bundler/file_fetcher_spec.rb
index 1bedd51e356..b039b4bb5cd 100644
--- a/bundler/spec/dependabot/bundler/file_fetcher_spec.rb
+++ b/bundler/spec/dependabot/bundler/file_fetcher_spec.rb
@@ -40,6 +40,14 @@
         body: fixture("github", "ruby_version_content.json"),
         headers: { "content-type" => "application/json" }
       )
+
+    stub_request(:get, File.join(url, ".tool-versions?ref=sha"))
+      .with(headers: { "Authorization" => "token token" })
+      .to_return(
+        status: 200,
+        body: fixture("github", "tool_versions_content.json"),
+        headers: { "content-type" => "application/json" }
+      )
   end
 
   context "with a directory" do
@@ -163,6 +171,40 @@
     end
   end
 
+  context "with a .tool-versions file" do
+    before do
+      stub_request(:get, url + "?ref=sha")
+        .with(headers: { "Authorization" => "token token" })
+        .to_return(
+          status: 200,
+          body: fixture("github", "contents_ruby_tool_versions.json"),
+          headers: { "content-type" => "application/json" }
+        )
+
+      stub_request(:get, url + "Gemfile?ref=sha")
+        .with(headers: { "Authorization" => "token token" })
+        .to_return(
+          status: 200,
+          body: fixture("github", "gemfile_with_ruby_tool_versions_content.json"),
+          headers: { "content-type" => "application/json" }
+        )
+
+      stub_request(:get, url + "Gemfile.lock?ref=sha")
+        .with(headers: { "Authorization" => "token token" })
+        .to_return(
+          status: 200,
+          body: fixture("github", "gemfile_lock_content.json"),
+          headers: { "content-type" => "application/json" }
+        )
+    end
+
+    it "fetches the tool-versions file" do
+      expect(file_fetcher_instance.files.count).to eq(3)
+      expect(file_fetcher_instance.files.map(&:name))
+        .to include(".tool-versions")
+    end
+  end
+
   context "with a gems.rb rather than a Gemfile" do
     before do
       stub_request(:get, url + "?ref=sha")
diff --git a/bundler/spec/dependabot/bundler/file_parser/file_preparer_spec.rb b/bundler/spec/dependabot/bundler/file_parser/file_preparer_spec.rb
index 597b2ef6b66..80b98ab8c96 100644
--- a/bundler/spec/dependabot/bundler/file_parser/file_preparer_spec.rb
+++ b/bundler/spec/dependabot/bundler/file_parser/file_preparer_spec.rb
@@ -56,6 +56,16 @@
       its(:content) { is_expected.to eq("2.2.0\n") }
     end
 
+    describe "the updated tool versions file" do
+      subject do
+        prepared_dependency_files.find { |f| f.name == ".tool-versions" }
+      end
+
+      let(:dependency_files) { bundler_project_dependency_files("tool_versions_file") }
+
+      its(:content) { is_expected.to eq("ruby 2.2.0\n") }
+    end
+
     describe "the updated .specification file" do
       subject do
         prepared_dependency_files.find { |f| f.name == "plugins/example/.specification" }
diff --git a/bundler/spec/dependabot/bundler/file_updater_spec.rb b/bundler/spec/dependabot/bundler/file_updater_spec.rb
index 0153bdcdbfc..44222f7e1e7 100644
--- a/bundler/spec/dependabot/bundler/file_updater_spec.rb
+++ b/bundler/spec/dependabot/bundler/file_updater_spec.rb
@@ -537,6 +537,24 @@
         end
       end
 
+      context "when the Gemfile loads a .tool-versions file" do
+        let(:project_name) { "tool_versions_file" }
+        let(:updater) do
+          described_class.new(
+            dependency_files: dependency_files,
+            dependencies: [dependency],
+            credentials: [{
+              "type" => "git_source",
+              "host" => "github.com"
+            }]
+          )
+        end
+
+        it "locks the updated gem to the latest version" do
+          expect(file.content).to include "business (1.5.0)"
+        end
+      end
+
       context "when the Gemfile.lock didn't have a BUNDLED WITH line" do
         let(:project_name) { "no_bundled_with" }
 
diff --git a/bundler/spec/dependabot/bundler/update_checker/latest_version_finder_spec.rb b/bundler/spec/dependabot/bundler/update_checker/latest_version_finder_spec.rb
index 79840794b84..1824b64c95b 100644
--- a/bundler/spec/dependabot/bundler/update_checker/latest_version_finder_spec.rb
+++ b/bundler/spec/dependabot/bundler/update_checker/latest_version_finder_spec.rb
@@ -213,6 +213,12 @@
         its([:version]) { is_expected.to eq(Gem::Version.new("1.5.0")) }
       end
 
+      context "when the Gemfile loads a .tool-versions file" do
+        let(:dependency_files) { bundler_project_dependency_files("tool_versions_file") }
+
+        its([:version]) { is_expected.to eq(Gem::Version.new("1.5.0")) }
+      end
+
       context "with a gemspec and a Gemfile" do
         let(:dependency_files) { bundler_project_dependency_files("gemfile_small_example") }
 
diff --git a/bundler/spec/fixtures/github/contents_ruby_tool_versions.json b/bundler/spec/fixtures/github/contents_ruby_tool_versions.json
new file mode 100644
index 00000000000..0d00573fd27
--- /dev/null
+++ b/bundler/spec/fixtures/github/contents_ruby_tool_versions.json
@@ -0,0 +1,450 @@
+[
+  {
+    "name": ".codeclimate.yml",
+    "path": ".codeclimate.yml",
+    "sha": "6393602fac96cfe31d64f89476014124b4a13b85",
+    "size": 416,
+    "url": "https://api.github.com/repos/CityOfNewYork/NYCOpenRecords/contents/.codeclimate.yml?ref=develop",
+    "html_url": "https://github.com/CityOfNewYork/NYCOpenRecords/blob/develop/.codeclimate.yml",
+    "git_url": "https://api.github.com/repos/CityOfNewYork/NYCOpenRecords/git/blobs/6393602fac96cfe31d64f89476014124b4a13b85",
+    "download_url": "https://raw.githubusercontent.com/CityOfNewYork/NYCOpenRecords/develop/.codeclimate.yml",
+    "type": "file",
+    "_links": {
+      "self": "https://api.github.com/repos/CityOfNewYork/NYCOpenRecords/contents/.codeclimate.yml?ref=develop",
+      "git": "https://api.github.com/repos/CityOfNewYork/NYCOpenRecords/git/blobs/6393602fac96cfe31d64f89476014124b4a13b85",
+      "html": "https://github.com/CityOfNewYork/NYCOpenRecords/blob/develop/.codeclimate.yml"
+    }
+  },
+  {
+    "name": ".coveragerc",
+    "path": ".coveragerc",
+    "sha": "be7fdc86067d0924f3e1e92c1a3ed92d9486fcbb",
+    "size": 646,
+    "url": "https://api.github.com/repos/CityOfNewYork/NYCOpenRecords/contents/.coveragerc?ref=develop",
+    "html_url": "https://github.com/CityOfNewYork/NYCOpenRecords/blob/develop/.coveragerc",
+    "git_url": "https://api.github.com/repos/CityOfNewYork/NYCOpenRecords/git/blobs/be7fdc86067d0924f3e1e92c1a3ed92d9486fcbb",
+    "download_url": "https://raw.githubusercontent.com/CityOfNewYork/NYCOpenRecords/develop/.coveragerc",
+    "type": "file",
+    "_links": {
+      "self": "https://api.github.com/repos/CityOfNewYork/NYCOpenRecords/contents/.coveragerc?ref=develop",
+      "git": "https://api.github.com/repos/CityOfNewYork/NYCOpenRecords/git/blobs/be7fdc86067d0924f3e1e92c1a3ed92d9486fcbb",
+      "html": "https://github.com/CityOfNewYork/NYCOpenRecords/blob/develop/.coveragerc"
+    }
+  },
+  {
+    "name": ".csslintrc",
+    "path": ".csslintrc",
+    "sha": "aacba956e5bbede1c195ce554fcad3e200b24ff8",
+    "size": 107,
+    "url": "https://api.github.com/repos/CityOfNewYork/NYCOpenRecords/contents/.csslintrc?ref=develop",
+    "html_url": "https://github.com/CityOfNewYork/NYCOpenRecords/blob/develop/.csslintrc",
+    "git_url": "https://api.github.com/repos/CityOfNewYork/NYCOpenRecords/git/blobs/aacba956e5bbede1c195ce554fcad3e200b24ff8",
+    "download_url": "https://raw.githubusercontent.com/CityOfNewYork/NYCOpenRecords/develop/.csslintrc",
+    "type": "file",
+    "_links": {
+      "self": "https://api.github.com/repos/CityOfNewYork/NYCOpenRecords/contents/.csslintrc?ref=develop",
+      "git": "https://api.github.com/repos/CityOfNewYork/NYCOpenRecords/git/blobs/aacba956e5bbede1c195ce554fcad3e200b24ff8",
+      "html": "https://github.com/CityOfNewYork/NYCOpenRecords/blob/develop/.csslintrc"
+    }
+  },
+  {
+    "name": ".env.example",
+    "path": ".env.example",
+    "sha": "d9f599b33ecd834ea88979dcc3daf4fcafacf4e7",
+    "size": 2617,
+    "url": "https://api.github.com/repos/CityOfNewYork/NYCOpenRecords/contents/.env.example?ref=develop",
+    "html_url": "https://github.com/CityOfNewYork/NYCOpenRecords/blob/develop/.env.example",
+    "git_url": "https://api.github.com/repos/CityOfNewYork/NYCOpenRecords/git/blobs/d9f599b33ecd834ea88979dcc3daf4fcafacf4e7",
+    "download_url": "https://raw.githubusercontent.com/CityOfNewYork/NYCOpenRecords/develop/.env.example",
+    "type": "file",
+    "_links": {
+      "self": "https://api.github.com/repos/CityOfNewYork/NYCOpenRecords/contents/.env.example?ref=develop",
+      "git": "https://api.github.com/repos/CityOfNewYork/NYCOpenRecords/git/blobs/d9f599b33ecd834ea88979dcc3daf4fcafacf4e7",
+      "html": "https://github.com/CityOfNewYork/NYCOpenRecords/blob/develop/.env.example"
+    }
+  },
+  {
+    "name": ".eslintignore",
+    "path": ".eslintignore",
+    "sha": "96212a3593bac8c93f624b77185a8d11018efd96",
+    "size": 16,
+    "url": "https://api.github.com/repos/CityOfNewYork/NYCOpenRecords/contents/.eslintignore?ref=develop",
+    "html_url": "https://github.com/CityOfNewYork/NYCOpenRecords/blob/develop/.eslintignore",
+    "git_url": "https://api.github.com/repos/CityOfNewYork/NYCOpenRecords/git/blobs/96212a3593bac8c93f624b77185a8d11018efd96",
+    "download_url": "https://raw.githubusercontent.com/CityOfNewYork/NYCOpenRecords/develop/.eslintignore",
+    "type": "file",
+    "_links": {
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+      "git": "https://api.github.com/repos/CityOfNewYork/NYCOpenRecords/git/blobs/96212a3593bac8c93f624b77185a8d11018efd96",
+      "html": "https://github.com/CityOfNewYork/NYCOpenRecords/blob/develop/.eslintignore"
+    }
+  },
+  {
+    "name": ".eslintrc.yml",
+    "path": ".eslintrc.yml",
+    "sha": "a6a0ce9c44238e06ff55ca335a66a4e16810da38",
+    "size": 6056,
+    "url": "https://api.github.com/repos/CityOfNewYork/NYCOpenRecords/contents/.eslintrc.yml?ref=develop",
+    "html_url": "https://github.com/CityOfNewYork/NYCOpenRecords/blob/develop/.eslintrc.yml",
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+      "html": "https://github.com/CityOfNewYork/NYCOpenRecords/blob/develop/.eslintrc.yml"
+    }
+  },
+  {
+    "name": ".gitignore",
+    "path": ".gitignore",
+    "sha": "93923ac3a463bd17d0aefca2de9d2810f243d747",
+    "size": 1073,
+    "url": "https://api.github.com/repos/CityOfNewYork/NYCOpenRecords/contents/.gitignore?ref=develop",
+    "html_url": "https://github.com/CityOfNewYork/NYCOpenRecords/blob/develop/.gitignore",
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+    "download_url": "https://raw.githubusercontent.com/CityOfNewYork/NYCOpenRecords/develop/.gitignore",
+    "type": "file",
+    "_links": {
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+    }
+  },
+  {
+    "name": ".tool-versions",
+    "path": ".tool-versions",
+    "sha": "8530aba7e822a670ff20de2c717391ebaf15c501",
+    "size": 11,
+    "url": "https://api.github.com/repos/CityOfNewYork/NYCOpenRecords/contents/.tool-versions?ref=develop",
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+    "download_url": "https://raw.githubusercontent.com/CityOfNewYork/NYCOpenRecords/develop/.tool-versions",
+    "type": "file",
+    "_links": {
+      "self": "https://api.github.com/repos/CityOfNewYork/NYCOpenRecords/contents/.tool-versions?ref=develop",
+      "git": "https://api.github.com/repos/CityOfNewYork/NYCOpenRecords/git/blobs/8530aba7e822a670ff20de2c717391ebaf15c501",
+      "html": "https://github.com/CityOfNewYork/NYCOpenRecords/blob/develop/.tool-versions"
+    }
+  },
+  {
+    "name": "LICENSE.md",
+    "path": "LICENSE.md",
+    "sha": "8dada3edaf50dbc082c9a125058f25def75e625a",
+    "size": 11357,
+    "url": "https://api.github.com/repos/CityOfNewYork/NYCOpenRecords/contents/LICENSE.md?ref=develop",
+    "html_url": "https://github.com/CityOfNewYork/NYCOpenRecords/blob/develop/LICENSE.md",
+    "git_url": "https://api.github.com/repos/CityOfNewYork/NYCOpenRecords/git/blobs/8dada3edaf50dbc082c9a125058f25def75e625a",
+    "download_url": "https://raw.githubusercontent.com/CityOfNewYork/NYCOpenRecords/develop/LICENSE.md",
+    "type": "file",
+    "_links": {
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+    "download_url": "https://raw.githubusercontent.com/gocardless/bump/master/Gemfile?token=ABF4KfGg6a7sE1n1i2rrhUvqAKRhIkPiks5WD8X5wA%3D%3D",
+    "type": "file",
+    "content": "c291cmNlICJodHRwczovL3J1YnlnZW1zLm9yZyIKCnJ1YnkgRmlsZS5vcGVu\nKCcudG9vbC12ZXJzaW9ucycsICdyYicpLm1hdGNoKCJydWJ5ICguKikKIilb\nMV0KCmdlbSAiYnVtcC1jb3JlIgpnZW0gInN0YXRlc21hbiIsIGdpdDogImh0\ndHBzOi8vZ2l0aHViLmNvbS9nb2NhcmRsZXNzL3N0YXRlc21hbi5naXQiCg==\n",
+    "encoding": "base64",
+    "_links": {
+        "self": "https://api.github.com/repos/gocardless/bump/contents/Gemfile?ref=master",
+        "git": "https://api.github.com/repos/gocardless/bump/git/blobs/dbce0c9e2e7efd19139c2c0aeb0110e837812c2f",
+        "html": "https://github.com/gocardless/bump/blob/master/Gemfile"
+    }
+}
diff --git a/bundler/spec/fixtures/github/tool_versions_content.json b/bundler/spec/fixtures/github/tool_versions_content.json
new file mode 100644
index 00000000000..77f6f7414b0
--- /dev/null
+++ b/bundler/spec/fixtures/github/tool_versions_content.json
@@ -0,0 +1,18 @@
+{
+    "name": ".tool-versions",
+    "path": ".tool-versions",
+    "sha": "005119baaa0653ca59d923010341d8341daa8c43",
+    "size": 6,
+    "url": "https://api.github.com/repos/gocardless/bump/contents/.tool-versions?ref=master",
+    "html_url": "https://github.com/gocardless/bump/blob/master/.tool-versions",
+    "git_url": "https://api.github.com/repos/gocardless/bump/git/blobs/005119baaa0653ca59d923010341d8341daa8c43",
+    "download_url": "https://raw.githubusercontent.com/gocardless/bump/master/.tool-versions",
+    "type": "file",
+    "content": "cnVieSAyLjQuMQo=\n",
+    "encoding": "base64",
+    "_links": {
+        "self": "https://api.github.com/repos/gocardless/bump/contents/.tool-versions?ref=master",
+        "git": "https://api.github.com/repos/gocardless/bump/git/blobs/005119baaa0653ca59d923010341d8341daa8c43",
+        "html": "https://github.com/gocardless/bump/blob/master/.tool-versions"
+    }
+}
diff --git a/bundler/spec/fixtures/projects/bundler1/tool_versions_file/.gitignore b/bundler/spec/fixtures/projects/bundler1/tool_versions_file/.gitignore
new file mode 100644
index 00000000000..48238a337f5
--- /dev/null
+++ b/bundler/spec/fixtures/projects/bundler1/tool_versions_file/.gitignore
@@ -0,0 +1 @@
+!.tool-versions
diff --git a/bundler/spec/fixtures/projects/bundler1/tool_versions_file/.tool-versions b/bundler/spec/fixtures/projects/bundler1/tool_versions_file/.tool-versions
new file mode 100644
index 00000000000..7e1bff11200
--- /dev/null
+++ b/bundler/spec/fixtures/projects/bundler1/tool_versions_file/.tool-versions
@@ -0,0 +1 @@
+ruby 2.2.0
diff --git a/bundler/spec/fixtures/projects/bundler1/tool_versions_file/Gemfile b/bundler/spec/fixtures/projects/bundler1/tool_versions_file/Gemfile
new file mode 100644
index 00000000000..34c4cf9e8f9
--- /dev/null
+++ b/bundler/spec/fixtures/projects/bundler1/tool_versions_file/Gemfile
@@ -0,0 +1,6 @@
+source "https://rubygems.org"
+
+ruby File.open('.tool-versions', 'rb') { |f| f.read.match(/ruby (.*)\n/)[1] }
+
+gem "business", "~> 1.4.0"
+gem "statesman", "~> 1.2.0"
diff --git a/bundler/spec/fixtures/projects/bundler1/tool_versions_file/Gemfile.lock b/bundler/spec/fixtures/projects/bundler1/tool_versions_file/Gemfile.lock
new file mode 100644
index 00000000000..65d23b6c746
--- /dev/null
+++ b/bundler/spec/fixtures/projects/bundler1/tool_versions_file/Gemfile.lock
@@ -0,0 +1,15 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    business (1.4.0)
+    statesman (1.2.1)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  business (~> 1.4.0)
+  statesman (~> 1.2.0)
+
+BUNDLED WITH
+   1.10.6
diff --git a/bundler/spec/fixtures/projects/bundler2/tool_versions_file/.gitignore b/bundler/spec/fixtures/projects/bundler2/tool_versions_file/.gitignore
new file mode 100644
index 00000000000..48238a337f5
--- /dev/null
+++ b/bundler/spec/fixtures/projects/bundler2/tool_versions_file/.gitignore
@@ -0,0 +1 @@
+!.tool-versions
diff --git a/bundler/spec/fixtures/projects/bundler2/tool_versions_file/.tool-versions b/bundler/spec/fixtures/projects/bundler2/tool_versions_file/.tool-versions
new file mode 100644
index 00000000000..7e1bff11200
--- /dev/null
+++ b/bundler/spec/fixtures/projects/bundler2/tool_versions_file/.tool-versions
@@ -0,0 +1 @@
+ruby 2.2.0
diff --git a/bundler/spec/fixtures/projects/bundler2/tool_versions_file/Gemfile b/bundler/spec/fixtures/projects/bundler2/tool_versions_file/Gemfile
new file mode 100644
index 00000000000..34c4cf9e8f9
--- /dev/null
+++ b/bundler/spec/fixtures/projects/bundler2/tool_versions_file/Gemfile
@@ -0,0 +1,6 @@
+source "https://rubygems.org"
+
+ruby File.open('.tool-versions', 'rb') { |f| f.read.match(/ruby (.*)\n/)[1] }
+
+gem "business", "~> 1.4.0"
+gem "statesman", "~> 1.2.0"
diff --git a/bundler/spec/fixtures/projects/bundler2/tool_versions_file/Gemfile.lock b/bundler/spec/fixtures/projects/bundler2/tool_versions_file/Gemfile.lock
new file mode 100644
index 00000000000..3fa0fb21893
--- /dev/null
+++ b/bundler/spec/fixtures/projects/bundler2/tool_versions_file/Gemfile.lock
@@ -0,0 +1,15 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    business (1.4.0)
+    statesman (1.2.1)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  business (~> 1.4.0)
+  statesman (~> 1.2.0)
+
+BUNDLED WITH
+   2.2.0
diff --git a/bundler/spec/spec_helper.rb b/bundler/spec/spec_helper.rb
index 3cf36e5d400..6e76d874e91 100644
--- a/bundler/spec/spec_helper.rb
+++ b/bundler/spec/spec_helper.rb
@@ -27,6 +27,9 @@ def self.bundler_version
 
 def bundler_project_dependency_files(project, directory: "/")
   project_dependency_files(File.join("bundler#{PackageManagerHelper.bundler_version}", project), directory: directory)
+    .each do |dep|
+      dep.support_file = dep.name.end_with?(".ruby-version", ".tool-versions")
+    end
 end
 
 def bundler_project_dependency_file(project, filename:)