diff --git a/CHANGELOG.md b/CHANGELOG.md
index 52b46258..2a23f940 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## main / unreleased
+
+* [ENHANCEMENT] Test against jQuery 4.0.0
+
 ## 23.0.0 / 2026-01-07
 
 * [FEATURE] Breaking change: Add `csv` prefix to CSV related data attributes:
diff --git a/lib/client_side_validations/action_view/form_builder.rb b/lib/client_side_validations/action_view/form_builder.rb
index c429b523..0bd2ed1b 100644
--- a/lib/client_side_validations/action_view/form_builder.rb
+++ b/lib/client_side_validations/action_view/form_builder.rb
@@ -63,7 +63,7 @@ def check_box(method, options = {}, checked_value = '1', unchecked_value = '0')
           end
         end
 
-        if ::ActionView::Helpers::FormBuilder.public_instance_methods.include?(:collection_checkboxes)
+        if ::ActionView::Helpers::FormBuilder.public_method_defined?(:collection_checkboxes)
           alias collection_checkboxes collection_check_boxes
         end
 
diff --git a/package.json b/package.json
index 434e1e9e..dec94f8a 100644
--- a/package.json
+++ b/package.json
@@ -22,20 +22,20 @@
     "test": "test/javascript/run-qunit.mjs"
   },
   "devDependencies": {
-    "@babel/core": "^7.28.5",
-    "@babel/preset-env": "^7.28.5",
+    "@babel/core": "^7.28.6",
+    "@babel/preset-env": "^7.28.6",
     "@rollup/plugin-babel": "^6.1.0",
     "@rollup/plugin-node-resolve": "^16.0.3",
     "chrome-launcher": "^1.2.1",
     "eslint": "^9.39.2",
-    "eslint-plugin-compat": "^6.0.2",
+    "eslint-plugin-compat": "^6.1.0",
     "neostandard": "^0.12.2",
-    "puppeteer-core": "^24.34.0",
-    "rollup": "^4.55.1",
+    "puppeteer-core": "^24.36.0",
+    "rollup": "^4.57.0",
     "rollup-plugin-copy": "^3.5.0"
   },
   "peerDependencies": {
-    "jquery": "^3.7.1"
+    "jquery": "^3.7.1 || ^4.0.0"
   },
   "main": "dist/client-side-validations.js",
   "module": "dist/client-side-validations.esm.js",
diff --git a/test/action_view/cases/test_form_for_helpers.rb b/test/action_view/cases/test_form_for_helpers.rb
index 351c88ce..eac7d310 100644
--- a/test/action_view/cases/test_form_for_helpers.rb
+++ b/test/action_view/cases/test_form_for_helpers.rb
@@ -457,7 +457,7 @@ def test_collection_check_boxes
       assert_dom_equal expected, output_buffer
     end
 
-    if ::ActionView::Helpers::FormBuilder.public_instance_methods.include?(:collection_checkboxes)
+    if ::ActionView::Helpers::FormBuilder.public_method_defined?(:collection_checkboxes)
       def test_collection_checkboxes
         form_for(@post, validate: true) do |f|
           concat f.collection_checkboxes(:cost, [], :id, :name)
diff --git a/test/action_view/cases/test_form_with_helpers.rb b/test/action_view/cases/test_form_with_helpers.rb
index cfafbd98..1b2ad42d 100644
--- a/test/action_view/cases/test_form_with_helpers.rb
+++ b/test/action_view/cases/test_form_with_helpers.rb
@@ -494,7 +494,7 @@ def test_form_with_collection_check_boxes
         assert_dom_equal expected, output_buffer
       end
 
-      if ::ActionView::Helpers::FormBuilder.public_instance_methods.include?(:collection_checkboxes)
+      if ::ActionView::Helpers::FormBuilder.public_method_defined?(:collection_checkboxes)
         def test_form_with_collection_checkboxes
           form_with(model: @post, validate: true) do |f|
             concat f.collection_checkboxes(:cost, [], :id, :name)
diff --git a/test/javascript/server.rb b/test/javascript/server.rb
index e6d498f8..d15f31f8 100644
--- a/test/javascript/server.rb
+++ b/test/javascript/server.rb
@@ -29,7 +29,7 @@ def call(env)
 use AssetPath, urls: ['/vendor/assets/javascripts'], root: File.expand_path('../..', settings.root)
 use AssetPath, urls: ['/vendor/assets/javascripts'], root: File.expand_path('../', $LOAD_PATH.find { |p| p.include?('jquery-rails') })
 
-DEFAULT_JQUERY_VERSION = '3.7.1'
+DEFAULT_JQUERY_VERSION = '4.0.0'
 QUNIT_VERSION          = '2.25.0'
 
 helpers do