diff --git a/lib/herb.rb b/lib/herb.rb
index af0081979..f0e06e039 100644
--- a/lib/herb.rb
+++ b/lib/herb.rb
@@ -118,5 +118,19 @@ def dev_server_port(project_path = nil)
     rescue StandardError
       nil
     end
+
+    def ensure_installed(&block)
+      require "bundler/inline"
+
+      verbose = $VERBOSE
+      $VERBOSE = nil
+
+      gemfile(true, quiet: true) do # steep:ignore
+        source "https://rubygems.org" # steep:ignore
+        instance_eval(&block) # steep:ignore
+      end
+    ensure
+      $VERBOSE = verbose
+    end
   end
 end
diff --git a/lib/herb/action_view/render_analyzer.rb b/lib/herb/action_view/render_analyzer.rb
index b4f183d32..61a10739b 100644
--- a/lib/herb/action_view/render_analyzer.rb
+++ b/lib/herb/action_view/render_analyzer.rb
@@ -784,12 +784,7 @@ def process_file_for_render_calls(file)
       def ensure_parallel!
         return if defined?(Parallel)
 
-        require "bundler/inline"
-
-        gemfile(true, quiet: true) do # steep:ignore
-          source "https://rubygems.org" # steep:ignore
-          gem "parallel" # steep:ignore
-        end
+        Herb.ensure_installed { gem "parallel" } # steep:ignore
       end
 
       def collect_ruby_render_references
diff --git a/lib/herb/project.rb b/lib/herb/project.rb
index 1630ba3fd..712b28841 100644
--- a/lib/herb/project.rb
+++ b/lib/herb/project.rb
@@ -903,12 +903,7 @@ def percentage(part, total)
     def ensure_parallel!
       return if defined?(Parallel)
 
-      require "bundler/inline"
-
-      gemfile(true, quiet: true) do
-        source "https://rubygems.org"
-        gem "parallel"
-      end
+      Herb.ensure_installed { gem "parallel" } # steep:ignore
     end
 
     def separator
diff --git a/sig/herb.rbs b/sig/herb.rbs
index 605f466f8..7aae701c9 100644
--- a/sig/herb.rbs
+++ b/sig/herb.rbs
@@ -23,4 +23,6 @@ module Herb
   def self.reset_configuration!: () -> untyped
 
   def self.dev_server_port: (?untyped project_path) -> untyped
+
+  def self.ensure_installed: () ?{ (?) -> untyped } -> untyped
 end