diff --git a/npm_and_yarn/lib/dependabot/npm_and_yarn/dependency_files_filterer.rb b/npm_and_yarn/lib/dependabot/npm_and_yarn/dependency_files_filterer.rb
index 930a957b53..91a22228a7 100644
--- a/npm_and_yarn/lib/dependabot/npm_and_yarn/dependency_files_filterer.rb
+++ b/npm_and_yarn/lib/dependabot/npm_and_yarn/dependency_files_filterer.rb
@@ -82,7 +82,7 @@ def package_required_lockfile?(lockfile)
 
       sig { params(lockfile: DependencyFile).returns(T::Boolean) }
       def workspaces_lockfile?(lockfile)
-        return false unless ["yarn.lock", "package-lock.json", "pnpm-lock.yaml"].include?(lockfile.name)
+        return false unless ["yarn.lock", "package-lock.json", "pnpm-lock.yaml", "bun.lock"].include?(lockfile.name)
 
         return false unless parsed_root_package_json["workspaces"] || dependency_files.any? do |file|
           file.name.end_with?("pnpm-workspace.yaml") && File.dirname(file.name) == File.dirname(lockfile.name)
@@ -148,6 +148,7 @@ def lockfile?(file)
           "package-lock.json",
           "yarn.lock",
           "pnpm-lock.yaml",
+          "bun.lock",
           "npm-shrinkwrap.json"
         )
       end
diff --git a/npm_and_yarn/lib/dependabot/npm_and_yarn/file_fetcher.rb b/npm_and_yarn/lib/dependabot/npm_and_yarn/file_fetcher.rb
index aa18e5a886..289b20ccb2 100644
--- a/npm_and_yarn/lib/dependabot/npm_and_yarn/file_fetcher.rb
+++ b/npm_and_yarn/lib/dependabot/npm_and_yarn/file_fetcher.rb
@@ -68,6 +68,7 @@ def ecosystem_versions
         package_managers["npm"] = npm_version if npm_version
         package_managers["yarn"] = yarn_version if yarn_version
         package_managers["pnpm"] = pnpm_version if pnpm_version
+        package_managers["bun"] = bun_version if bun_version
         package_managers["unknown"] = 1 if package_managers.empty?
 
         {
@@ -83,6 +84,7 @@ def fetch_files
         fetched_files += npm_files if npm_version
         fetched_files += yarn_files if yarn_version
         fetched_files += pnpm_files if pnpm_version
+        fetched_files += bun_files if bun_version
         fetched_files += lerna_files
         fetched_files += workspace_package_jsons
         fetched_files += path_dependencies(fetched_files)
@@ -120,6 +122,13 @@ def pnpm_files
         fetched_pnpm_files
       end
 
+      sig { returns(T::Array[DependencyFile]) }
+      def bun_files
+        fetched_bun_files = []
+        fetched_bun_files << bun_lock if bun_lock
+        fetched_bun_files
+      end
+
       sig { returns(T::Array[DependencyFile]) }
       def lerna_files
         fetched_lerna_files = []
@@ -202,6 +211,16 @@ def pnpm_version
         )
       end
 
+      sig { returns(T.nilable(T.any(Integer, String))) }
+      def bun_version
+        return @bun_version = nil unless Experiments.enabled?(:bun_updates)
+
+        @bun_version ||= T.let(
+          package_manager_helper.setup(BunPackageManager::NAME),
+          T.nilable(T.any(Integer, String))
+        )
+      end
+
       sig { returns(PackageManagerHelper) }
       def package_manager_helper
         @package_manager_helper ||= T.let(
@@ -219,7 +238,8 @@ def lockfiles
         {
           npm: package_lock || shrinkwrap,
           yarn: yarn_lock,
-          pnpm: pnpm_lock
+          pnpm: pnpm_lock,
+          bun: bun_lock
         }
       end
 
@@ -261,17 +281,18 @@ def pnpm_lock
 
         return @pnpm_lock if @pnpm_lock || directory == "/"
 
-        # Loop through parent directories looking for a pnpm-lock
-        (1..directory.split("/").count).each do |i|
-          @pnpm_lock = fetch_file_from_host(("../" * i) + PNPMPackageManager::LOCKFILE_NAME)
-                       .tap { |f| f.support_file = true }
-          break if @pnpm_lock
-        rescue Dependabot::DependencyFileNotFound
-          # Ignore errors (pnpm_lock.yaml may not be present)
-          nil
-        end
+        @pnpm_lock = fetch_file_from_parent_directories(PNPMPackageManager::LOCKFILE_NAME)
+      end
+
+      sig { returns(T.nilable(DependencyFile)) }
+      def bun_lock
+        return @bun_lock if defined?(@bun_lock)
+
+        @bun_lock ||= T.let(fetch_file_if_present(BunPackageManager::LOCKFILE_NAME), T.nilable(DependencyFile))
 
-        @pnpm_lock
+        return @bun_lock if @bun_lock || directory == "/"
+
+        @bun_lock = fetch_file_from_parent_directories(BunPackageManager::LOCKFILE_NAME)
       end
 
       sig { returns(T.nilable(DependencyFile)) }
@@ -294,17 +315,7 @@ def npmrc
 
         return @npmrc if @npmrc || directory == "/"
 
-        # Loop through parent directories looking for an npmrc
-        (1..directory.split("/").count).each do |i|
-          @npmrc = fetch_file_from_host(("../" * i) + NpmPackageManager::RC_FILENAME)
-                   .tap { |f| f.support_file = true }
-          break if @npmrc
-        rescue Dependabot::DependencyFileNotFound
-          # Ignore errors (.npmrc may not be present)
-          nil
-        end
-
-        @npmrc
+        @npmrc = fetch_file_from_parent_directories(NpmPackageManager::RC_FILENAME)
       end
 
       sig { returns(T.nilable(DependencyFile)) }
@@ -315,17 +326,7 @@ def yarnrc
 
         return @yarnrc if @yarnrc || directory == "/"
 
-        # Loop through parent directories looking for an yarnrc
-        (1..directory.split("/").count).each do |i|
-          @yarnrc = fetch_file_from_host(("../" * i) + YarnPackageManager::RC_FILENAME)
-                    .tap { |f| f.support_file = true }
-          break if @yarnrc
-        rescue Dependabot::DependencyFileNotFound
-          # Ignore errors (.yarnrc may not be present)
-          nil
-        end
-
-        @yarnrc
+        @yarnrc = fetch_file_from_parent_directories(YarnPackageManager::RC_FILENAME)
       end
 
       sig { returns(T.nilable(DependencyFile)) }
@@ -699,6 +700,22 @@ def create_yarn_cache
           Dependabot.logger.info("Repository contents path does not exist")
         end
       end
+
+      sig { params(filename: String).returns(T.nilable(DependencyFile)) }
+      def fetch_file_with_support(filename)
+        fetch_file_from_host(filename).tap { |f| f.support_file = true }
+      rescue Dependabot::DependencyFileNotFound
+        nil
+      end
+
+      sig { params(filename: String).returns(T.nilable(DependencyFile)) }
+      def fetch_file_from_parent_directories(filename)
+        (1..directory.split("/").count).each do |i|
+          file = fetch_file_with_support(("../" * i) + filename)
+          return file if file
+        end
+        nil
+      end
     end
   end
 end
diff --git a/npm_and_yarn/lib/dependabot/npm_and_yarn/sub_dependency_files_filterer.rb b/npm_and_yarn/lib/dependabot/npm_and_yarn/sub_dependency_files_filterer.rb
index 9a6334a004..feb13eb0ba 100644
--- a/npm_and_yarn/lib/dependabot/npm_and_yarn/sub_dependency_files_filterer.rb
+++ b/npm_and_yarn/lib/dependabot/npm_and_yarn/sub_dependency_files_filterer.rb
@@ -68,6 +68,7 @@ def lockfile?(file)
           "package-lock.json",
           "yarn.lock",
           "npm-shrinkwrap.json",
+          "bun.lock",
           "pnpm-lock.yaml"
         )
       end
diff --git a/npm_and_yarn/spec/dependabot/npm_and_yarn/dependency_files_filterer_spec.rb b/npm_and_yarn/spec/dependabot/npm_and_yarn/dependency_files_filterer_spec.rb
index 2688987838..03446c15cb 100644
--- a/npm_and_yarn/spec/dependabot/npm_and_yarn/dependency_files_filterer_spec.rb
+++ b/npm_and_yarn/spec/dependabot/npm_and_yarn/dependency_files_filterer_spec.rb
@@ -150,6 +150,17 @@ def project_dependency_file(file_name)
       end
     end
 
+    context "when using bun.lock" do
+      let(:project_name) { "bun/simple_v0" }
+
+      it do
+        expect(files_requiring_update).to contain_exactly(
+          project_dependency_file("package.json"),
+          project_dependency_file("bun.lock")
+        )
+      end
+    end
+
     context "with multiple dependencies" do
       let(:project_name) { "npm6_and_yarn/nested_dependency_update" }
       let(:updated_dependencies) { [dependency, other_dependency] }
diff --git a/npm_and_yarn/spec/dependabot/npm_and_yarn/file_fetcher_spec.rb b/npm_and_yarn/spec/dependabot/npm_and_yarn/file_fetcher_spec.rb
index 3ef3f99a60..1a18fde224 100644
--- a/npm_and_yarn/spec/dependabot/npm_and_yarn/file_fetcher_spec.rb
+++ b/npm_and_yarn/spec/dependabot/npm_and_yarn/file_fetcher_spec.rb
@@ -379,6 +379,20 @@
             body: nil,
             headers: json_header
           )
+        stub_request(:get, File.join(url, "bun.lock?ref=sha"))
+          .with(headers: { "Authorization" => "token token" })
+          .to_return(
+            status: 404,
+            body: nil,
+            headers: json_header
+          )
+        stub_request(:get, File.join(url, "packages/bun.lock?ref=sha"))
+          .with(headers: { "Authorization" => "token token" })
+          .to_return(
+            status: 404,
+            body: nil,
+            headers: json_header
+          )
         # FileFetcher will iterate trying to find `pnpm-lock.yaml` upwards in the folder tree
         stub_request(:get, File.join(url, "packages/pnpm-lock.yaml?ref=sha"))
           .with(headers: { "Authorization" => "token token" })
@@ -488,6 +502,39 @@
     end
   end
 
+  context "with a bun.lock but no package-lock.json file" do
+    before do
+      stub_request(:get, url + "?ref=sha")
+        .with(headers: { "Authorization" => "token token" })
+        .to_return(
+          status: 200,
+          body: fixture("github", "contents_js_bun.json"),
+          headers: json_header
+        )
+      stub_request(:get, File.join(url, "package-lock.json?ref=sha"))
+        .with(headers: { "Authorization" => "token token" })
+        .to_return(status: 404)
+      stub_request(:get, File.join(url, "bun.lock?ref=sha"))
+        .with(headers: { "Authorization" => "token token" })
+        .to_return(
+          status: 200,
+          body: fixture("github", "bun_lock_content.json"),
+          headers: json_header
+        )
+    end
+
+    it "fetches the package.json and bun.lock" do
+      expect(file_fetcher_instance.files.map(&:name))
+        .to match_array(%w(package.json bun.lock))
+    end
+
+    it "parses the bun.lock" do
+      expect(file_fetcher_instance.ecosystem_versions).to match(
+        { package_managers: { "bun" => an_instance_of(Integer) } }
+      )
+    end
+  end
+
   context "with an npm-shrinkwrap.json but no package-lock.json file" do
     before do
       stub_request(:get, url + "?ref=sha")
@@ -1271,6 +1318,12 @@
             "pnpm-lock.yaml?ref=sha"
           ).with(headers: { "Authorization" => "token token" })
             .to_return(status: 404)
+          stub_request(
+            :get,
+            "https://api.github.com/repos/gocardless/bump/contents/" \
+            "bun.lock?ref=sha"
+          ).with(headers: { "Authorization" => "token token" })
+            .to_return(status: 404)
         end
 
         it "fetches package.json from the workspace dependencies" do
@@ -1840,6 +1893,12 @@
             "pnpm-lock.yaml?ref=sha"
           ).with(headers: { "Authorization" => "token token" })
             .to_return(status: 404)
+          stub_request(
+            :get,
+            "https://api.github.com/repos/gocardless/bump/contents/" \
+            "bun.lock?ref=sha"
+          ).with(headers: { "Authorization" => "token token" })
+            .to_return(status: 404)
         end
 
         it "fetches package.json from the workspace dependencies" do