diff --git a/CHANGELOG.md b/CHANGELOG.md
index e0dc4a3bc..673813b7c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,7 +4,9 @@ Note: For changes to the API, see https://shopify.dev/changelog?filter=api
 ## Unreleased
 - [#1443](https://github.com/Shopify/shopify-api-ruby/pull/1443) Add `ShopifyAPI::Utils::ShopValidator` (module) with `sanitize_shop_domain` and `sanitize!`.
 - [#1443](https://github.com/Shopify/shopify-api-ruby/pull/1443) `ShopifyAPI::Auth::TokenExchange.exchange_token` always uses the session token's `dest` claim, instead of the `shop` parameter, that is now deprecated. It will show a deprecation warning and the argument will be removed in the next major version.
-- Add support for 2026-07 API version
+- [#1454](https://github.com/Shopify/shopify-api-ruby/pull/1454) Add support for 2026-07 API version
+- [#1457](https://github.com/Shopify/shopify-api-ruby/pull/1457) Add support for the 2026-10 API version. REST resources for 2026-10 are not bundled yet; the GraphQL Admin API and the REST client are unaffected.
+- [#1457](https://github.com/Shopify/shopify-api-ruby/pull/1457) Referencing a REST resource for an API version whose resources aren't bundled now raises `ShopifyAPI::Errors::RestResourceNotLoadedError` (a `NameError` subclass) explaining the version gap, instead of a bare `uninitialized constant`.
 
 ## 16.2.0 (2026-04-13)
 - [#1442](https://github.com/Shopify/shopify-api-ruby/pull/1442) Add support for 2026-04 API version
diff --git a/Gemfile.lock b/Gemfile.lock
index 27740b31c..482793503 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -8,6 +8,7 @@ PATH
       hash_diff
       httparty
       jwt
+      logger
       oj
       openssl
       securerandom
diff --git a/lib/shopify_api.rb b/lib/shopify_api.rb
index 2414f6dab..ba984b2a9 100644
--- a/lib/shopify_api.rb
+++ b/lib/shopify_api.rb
@@ -8,6 +8,7 @@
 require "securerandom"
 require "cgi"
 require "uri"
+require "logger"
 require "openssl"
 require "httparty"
 require "zeitwerk"
@@ -22,3 +23,71 @@
 loader.inflector = ShopifyAPI::Inflector.new(__FILE__)
 loader.ignore("#{__dir__}/shopify_api/rest/resources")
 loader.setup
+
+module ShopifyAPI
+  REST_RESOURCES_PATH = T.let("#{__dir__}/shopify_api/rest/resources", String)
+
+  class << self
+    extend T::Sig
+
+    # REST resources are only autoloaded for API versions this gem bundles (see
+    # Context.load_rest_resources). Without this hook, using a version whose
+    # resources aren't bundled - a newly released version, or `unstable` - fails
+    # with a bare "uninitialized constant", which reads like a gem bug instead
+    # of a version-coverage gap. GraphQL and the REST client are unaffected.
+    sig { params(name: Symbol).returns(T.untyped) }
+    def const_missing(name)
+      if bundled_rest_resource_names.include?(name.to_s)
+        # Pass `name` through so NameError#name still returns the missing
+        # constant, as it does for the NameError Ruby would have raised.
+        raise Errors::RestResourceNotLoadedError.new(rest_resource_not_loaded_message(name), name)
+      end
+
+      super
+    end
+
+    private
+
+    # Constant names of every REST resource bundled for any API version, derived
+    # the same way Zeitwerk derives them so the two cannot drift.
+    sig { returns(T::Array[String]) }
+    def bundled_rest_resource_names
+      @bundled_rest_resource_names ||= T.let(
+        Dir.glob("#{REST_RESOURCES_PATH}/*/*.rb").map do |path|
+          Zeitwerk::Inflector.new.camelize(File.basename(path, ".rb"), path)
+        end.uniq,
+        T.nilable(T::Array[String]),
+      )
+    end
+
+    sig { returns(T::Array[String]) }
+    def bundled_rest_resource_versions
+      @bundled_rest_resource_versions ||= T.let(
+        Dir.glob("#{REST_RESOURCES_PATH}/*")
+          .select { |path| File.directory?(path) }
+          .map { |path| File.basename(path).tr("_", "-") }
+          .sort,
+        T.nilable(T::Array[String]),
+      )
+    end
+
+    sig { params(name: Symbol).returns(String) }
+    def rest_resource_not_loaded_message(name)
+      api_version = Context.api_version
+
+      reason = if api_version.empty?
+        "ShopifyAPI::Context has not been set up, so no REST resources have been loaded. " \
+          "Call ShopifyAPI::Context.setup before using REST resources."
+      elsif api_version == "unstable"
+        "REST resources are not bundled for the \"unstable\" API version. Set api_version to a " \
+          "stable version to use REST resources, or use the GraphQL Admin API."
+      else
+        "shopify_api #{VERSION} does not bundle REST resources for API version \"#{api_version}\" " \
+          "(latest bundled: \"#{bundled_rest_resource_versions.last}\"). Upgrade the gem, set " \
+          "api_version to a bundled version, or use the GraphQL Admin API."
+      end
+
+      "uninitialized constant ShopifyAPI::#{name}. #{reason}"
+    end
+  end
+end
diff --git a/lib/shopify_api/admin_versions.rb b/lib/shopify_api/admin_versions.rb
index 8fadab6f2..a5a3d6e43 100644
--- a/lib/shopify_api/admin_versions.rb
+++ b/lib/shopify_api/admin_versions.rb
@@ -5,6 +5,7 @@ module ShopifyAPI
   module AdminVersions
     SUPPORTED_ADMIN_VERSIONS = T.let([
       "unstable",
+      "2026-10",
       "2026-07",
       "2026-04",
       "2026-01",
diff --git a/lib/shopify_api/context.rb b/lib/shopify_api/context.rb
index e7294ab5d..19a18bfa9 100644
--- a/lib/shopify_api/context.rb
+++ b/lib/shopify_api/context.rb
@@ -114,7 +114,11 @@ def load_rest_resources(api_version:)
 
         unless Dir.exist?(path)
           unless @notified_missing_resources_folder.key?(api_version)
-            @logger.warn("Cannot autoload REST resources for API version '#{version_folder_name}', folder is missing")
+            @logger.warn(
+              "shopify_api #{ShopifyAPI::VERSION} does not bundle REST resources for API version " \
+                "'#{api_version}', so REST resource classes are unavailable. The GraphQL Admin API and " \
+                "the REST client are unaffected.",
+            )
             @notified_missing_resources_folder[api_version] = true
           end
 
diff --git a/lib/shopify_api/errors/rest_resource_not_loaded_error.rb b/lib/shopify_api/errors/rest_resource_not_loaded_error.rb
new file mode 100644
index 000000000..86c58e374
--- /dev/null
+++ b/lib/shopify_api/errors/rest_resource_not_loaded_error.rb
@@ -0,0 +1,14 @@
+# typed: strict
+# frozen_string_literal: true
+
+module ShopifyAPI
+  module Errors
+    # Raised when a REST resource class is referenced but this gem version does
+    # not bundle REST resources for the active API version.
+    #
+    # Subclasses NameError so existing `rescue NameError` handling keeps working.
+    # Construct it with the missing constant name - `new(message, name)` - so
+    # NameError#name keeps returning it, matching the NameError Ruby would raise.
+    class RestResourceNotLoadedError < NameError; end
+  end
+end
diff --git a/shopify_api.gemspec b/shopify_api.gemspec
index aa33ec4dd..babb52bc6 100644
--- a/shopify_api.gemspec
+++ b/shopify_api.gemspec
@@ -38,6 +38,7 @@ Gem::Specification.new do |s|
   s.add_runtime_dependency("hash_diff")
   s.add_runtime_dependency("httparty")
   s.add_runtime_dependency("jwt")
+  s.add_runtime_dependency("logger")
   s.add_runtime_dependency("oj")
   s.add_runtime_dependency("openssl")
   s.add_runtime_dependency("securerandom")
diff --git a/test/admin_versions_test.rb b/test/admin_versions_test.rb
index bb3ee01c1..cf661f2cb 100644
--- a/test/admin_versions_test.rb
+++ b/test/admin_versions_test.rb
@@ -8,5 +8,20 @@ class AdminVersionsTest < Minitest::Test
     def test_supported_admin_versions
       assert_instance_of(Array, ShopifyAPI::AdminVersions::SUPPORTED_ADMIN_VERSIONS)
     end
+
+    def test_unstable_is_first_and_dated_versions_are_newest_first
+      versions = ShopifyAPI::AdminVersions::SUPPORTED_ADMIN_VERSIONS
+
+      assert_equal("unstable", versions.first)
+
+      dated = versions.drop(1)
+      assert_equal(dated.sort.reverse, dated, "dated versions must be listed newest first")
+    end
+
+    def test_includes_the_next_quarterly_release_candidate
+      # The next quarterly is supported before its REST resources are bundled so
+      # GraphQL and REST client users can target it on release day.
+      assert_includes(ShopifyAPI::AdminVersions::SUPPORTED_ADMIN_VERSIONS, "2026-10")
+    end
   end
 end
diff --git a/test/rest_resource_loading_test.rb b/test/rest_resource_loading_test.rb
new file mode 100644
index 000000000..102bc6e55
--- /dev/null
+++ b/test/rest_resource_loading_test.rb
@@ -0,0 +1,131 @@
+# typed: true
+# frozen_string_literal: true
+
+require_relative "test_helper"
+
+module ShopifyAPITest
+  class RestResourceLoadingTest < Minitest::Test
+    BUNDLED_VERSION = "2026-04"
+    UNBUNDLED_VERSION = "2026-10"
+
+    def setup
+      setup_context(api_version: BUNDLED_VERSION)
+    end
+
+    def teardown
+      setup_context(api_version: BUNDLED_VERSION)
+      ShopifyAPI::Context.deactivate_session
+    end
+
+    def test_rest_resources_are_loaded_for_a_bundled_version
+      assert_operator(ShopifyAPI::Product, :<, ShopifyAPI::Rest::Base)
+    end
+
+    def test_explains_that_resources_are_not_bundled_for_the_active_version
+      setup_context(api_version: UNBUNDLED_VERSION)
+
+      error = assert_raises(ShopifyAPI::Errors::RestResourceNotLoadedError) do
+        ShopifyAPI::Product
+      end
+
+      assert_kind_of(NameError, error)
+      assert_includes(error.message, "uninitialized constant ShopifyAPI::Product")
+      assert_includes(error.message, UNBUNDLED_VERSION)
+      assert_includes(error.message, "GraphQL Admin API")
+    end
+
+    def test_preserves_name_error_name_for_consumers_that_inspect_it
+      setup_context(api_version: UNBUNDLED_VERSION)
+
+      error = assert_raises(ShopifyAPI::Errors::RestResourceNotLoadedError) do
+        ShopifyAPI::Product
+      end
+
+      assert_equal(:Product, error.name)
+    end
+
+    def test_reports_the_missing_resource_in_a_process_that_only_requires_the_gem
+      lib = File.expand_path("../lib", __dir__)
+      output = IO.popen(
+        [RbConfig.ruby, "-I#{lib}", "-e", 'require "shopify_api"; ShopifyAPI::Product'],
+        err: [:child, :out],
+        &:read
+      )
+
+      refute_includes(output, "uninitialized constant Logger")
+      assert_includes(output, "RestResourceNotLoadedError")
+      assert_includes(output, "Context has not been set up")
+    end
+
+    # Context builds a Logger at class-definition time, and the error message
+    # above reads Context.api_version - so autoloading Context needs Logger to be
+    # defined. Whether it happens to be defined transitively depends on the
+    # resolved dependency set, which is why the entrypoint must require it. The
+    # subprocess test above cannot catch a regression here on its own: under this
+    # gem's own bundle, a locked dependency loads logger anyway.
+    def test_entrypoint_requires_logger_rather_than_relying_on_a_transitive_require
+      entrypoint = File.read(File.expand_path("../lib/shopify_api.rb", __dir__))
+
+      assert_includes(entrypoint, %(require "logger"))
+    end
+
+    def test_names_the_latest_bundled_version_so_the_gap_is_obvious
+      setup_context(api_version: UNBUNDLED_VERSION)
+
+      error = assert_raises(ShopifyAPI::Errors::RestResourceNotLoadedError) do
+        ShopifyAPI::Product
+      end
+
+      assert_includes(error.message, "latest bundled")
+    end
+
+    def test_explains_that_unstable_never_bundles_resources
+      setup_context(api_version: "unstable")
+
+      error = assert_raises(ShopifyAPI::Errors::RestResourceNotLoadedError) do
+        ShopifyAPI::Product
+      end
+
+      assert_includes(error.message, "unstable")
+    end
+
+    def test_unknown_constants_still_raise_an_ordinary_name_error
+      setup_context(api_version: UNBUNDLED_VERSION)
+
+      error = assert_raises(NameError) do
+        ShopifyAPI.const_missing(:NotAShopifyRestResource)
+      end
+
+      refute_kind_of(ShopifyAPI::Errors::RestResourceNotLoadedError, error)
+    end
+
+    def test_warns_when_the_resources_folder_is_missing
+      # Context only warns once per version per process, so reset the record to
+      # keep this test independent of execution order.
+      ShopifyAPI::Context.instance_variable_set(:@notified_missing_resources_folder, {})
+      setup_context(api_version: UNBUNDLED_VERSION)
+
+      assert_includes(@logs.string, UNBUNDLED_VERSION)
+      assert_includes(@logs.string, "REST resource")
+      assert_includes(@logs.string, "GraphQL Admin API")
+    end
+
+    private
+
+    def setup_context(api_version:)
+      @logs = StringIO.new
+
+      ShopifyAPI::Context.setup(
+        api_key: "key",
+        api_secret_key: "secret",
+        api_version: api_version,
+        scope: [],
+        is_private: true,
+        is_embedded: true,
+        log_level: :warn,
+        logger: Logger.new(@logs),
+        private_shop: "privateshop.myshopify.com",
+      )
+    end
+  end
+end