diff --git a/lib/bundler/multilock.rb b/lib/bundler/multilock.rb
index 0ca4956..d8782a7 100644
--- a/lib/bundler/multilock.rb
+++ b/lib/bundler/multilock.rb
@@ -5,6 +5,7 @@
 require_relative "multilock/ext/dsl"
 require_relative "multilock/ext/plugin"
 require_relative "multilock/ext/plugin/dsl"
+require_relative "multilock/ext/shared_helpers"
 require_relative "multilock/ext/source"
 require_relative "multilock/ext/source_list"
 require_relative "multilock/version"
@@ -427,7 +428,7 @@ def write_lockfile(lockfile_definition, lockfile, install:, dependency_changes:
         end
 
         resolved_remotely = false
-        begin
+        accesses = begin
           previous_ui_level = Bundler.ui.level
           Bundler.ui.level = "warn"
           begin
@@ -438,7 +439,9 @@ def write_lockfile(lockfile_definition, lockfile, install:, dependency_changes:
             definition.resolve_remotely!
             resolved_remotely = true
           end
-          definition.lock(lockfile_definition[:lockfile], true)
+          SharedHelpers.capture_filesystem_access do
+            definition.lock(lockfile_definition[:lockfile], true)
+          end
         ensure
           Bundler.ui.level = previous_ui_level
         end
@@ -451,7 +454,7 @@ def write_lockfile(lockfile_definition, lockfile, install:, dependency_changes:
           end
         end
 
-        !definition.nothing_changed?
+        accesses && !accesses.empty?
       end
     end
 
diff --git a/lib/bundler/multilock/ext/shared_helpers.rb b/lib/bundler/multilock/ext/shared_helpers.rb
new file mode 100644
index 0000000..8ab4106
--- /dev/null
+++ b/lib/bundler/multilock/ext/shared_helpers.rb
@@ -0,0 +1,28 @@
+# frozen_string_literal: true
+
+module Bundler
+  module Multilock
+    module Ext
+      module SharedHeleprs
+        module ClassMethods
+          ::Bundler::SharedHelpers.singleton_class.prepend(self)
+          ::Bundler::SharedHelpers.instance_variable_set(:@filesystem_accesses, nil)
+
+          def capture_filesystem_access
+            @filesystem_accesses = []
+            yield
+            @filesystem_accesses
+          ensure
+            @filesystem_accesses = nil
+          end
+
+          def filesystem_access(path, action = :write)
+            @filesystem_accesses << [path, action] if @filesystem_accesses
+
+            super
+          end
+        end
+      end
+    end
+  end
+end