diff --git a/lib/bundler/rubygems_gem_installer.rb b/lib/bundler/rubygems_gem_installer.rb
index 62756680e7..65fdf16072 100644
--- a/lib/bundler/rubygems_gem_installer.rb
+++ b/lib/bundler/rubygems_gem_installer.rb
@@ -145,7 +145,6 @@ module Bundler
       SharedHelpers.filesystem_access(extension_dir, :create) do
         FileUtils.mkdir_p extension_dir
       end
-      require "shellwords" unless Bundler.rubygems.provides?(">= 3.2.25")
     end
 
     def strict_rm_rf(dir)
diff --git a/lib/bundler/rubygems_integration.rb b/lib/bundler/rubygems_integration.rb
index 7abaa236ed..e77704aa0a 100644
--- a/lib/bundler/rubygems_integration.rb
+++ b/lib/bundler/rubygems_integration.rb
@@ -20,10 +20,6 @@ module Bundler
       Gem::Requirement.new(req_str).satisfied_by?(version)
     end
 
-    def supports_bundler_trampolining?
-      provides?(">= 3.3.0.a")
-    end
-
     def build_args
       require "rubygems/command"
       Gem::Command.build_args
@@ -356,11 +352,7 @@ module Bundler
       @replaced_methods.each do |(sym, klass), method|
         redefine_method(klass, sym, method)
       end
-      if Binding.public_method_defined?(:source_location)
-        post_reset_hooks.reject! {|proc| proc.binding.source_location[0] == __FILE__ }
-      else
-        post_reset_hooks.reject! {|proc| proc.binding.eval("__FILE__") == __FILE__ }
-      end
+      post_reset_hooks.reject! {|proc| proc.binding.source_location[0] == __FILE__ }
       @replaced_methods.clear
     end
 
diff --git a/lib/bundler/self_manager.rb b/lib/bundler/self_manager.rb
index a6d93f20ff..6ab41b99f7 100644
--- a/lib/bundler/self_manager.rb
+++ b/lib/bundler/self_manager.rb
@@ -106,7 +106,6 @@ module Bundler
 
     def autoswitching_applies?
       ENV["BUNDLER_VERSION"].nil? &&
-        Bundler.rubygems.supports_bundler_trampolining? &&
         ruby_can_restart_with_same_arguments? &&
         SharedHelpers.in_bundle? &&
         lockfile_version