diff --git a/CHANGELOG.md b/CHANGELOG.md
index dc44329..b1070ba 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,7 @@
 ## 5.0.0 (unreleased)
 
 - Dropped support for Ruby < 2.6 and Active Record < 5.2
+- Dropped support for NoBrainer and Cequel
 
 ## 4.6.3 (2021-11-19)
 
diff --git a/README.md b/README.md
index 7c7bd1d..d8826bd 100644
--- a/README.md
+++ b/README.md
@@ -20,7 +20,7 @@ Plus:
 - autocomplete
 - “Did you mean” suggestions
 - supports many languages
-- works with Active Record, Mongoid, and NoBrainer
+- works with Active Record and Mongoid
 
 Check out [Searchjoy](https://github.com/ankane/searchjoy) for analytics and [Autosuggest](https://github.com/ankane/autosuggest) for query suggestions
 
diff --git a/gemfiles/cequel.gemfile b/gemfiles/cequel.gemfile
deleted file mode 100644
index 6707378..0000000
--- a/gemfiles/cequel.gemfile
+++ /dev/null
@@ -1,9 +0,0 @@
-source "https://rubygems.org"
-
-gemspec path: ".."
-
-gem "rake"
-gem "minitest", ">= 5"
-gem "cequel"
-gem "activejob"
-gem "redis"
diff --git a/gemfiles/nobrainer.gemfile b/gemfiles/nobrainer.gemfile
deleted file mode 100644
index c1b0563..0000000
--- a/gemfiles/nobrainer.gemfile
+++ /dev/null
@@ -1,9 +0,0 @@
-source "https://rubygems.org"
-
-gemspec path: ".."
-
-gem "rake"
-gem "minitest", ">= 5"
-gem "nobrainer", ">= 0.21.0"
-gem "activejob"
-gem "redis"
diff --git a/lib/searchkick.rb b/lib/searchkick.rb
index b7bf2b5..c6ca3a4 100644
--- a/lib/searchkick.rb
+++ b/lib/searchkick.rb
@@ -223,9 +223,6 @@ module Searchkick
       elsif records.respond_to?(:queryable)
         # Mongoid 3+
         records.queryable.for_ids(ids)
-      elsif records.respond_to?(:unscoped) && :id.respond_to?(:in)
-        # Nobrainer
-        records.unscoped.where(:id.in => ids)
       elsif records.respond_to?(:key_column_names)
         records.where(records.key_column_names.first => ids)
       end
diff --git a/lib/searchkick/model.rb b/lib/searchkick/model.rb
index fe8d14e..18f04f0 100644
--- a/lib/searchkick/model.rb
+++ b/lib/searchkick/model.rb
@@ -99,12 +99,6 @@ module Searchkick
         def should_index?
           true
         end unless method_defined?(:should_index?)
-
-        if defined?(Cequel) && self < Cequel::Record && !method_defined?(:destroyed?)
-          def destroyed?
-            transient?
-          end
-        end
       end
     end
   end
diff --git a/lib/searchkick/reindex_v2_job.rb b/lib/searchkick/reindex_v2_job.rb
index 03c8bb8..3696305 100644
--- a/lib/searchkick/reindex_v2_job.rb
+++ b/lib/searchkick/reindex_v2_job.rb
@@ -2,9 +2,7 @@ module Searchkick
   class ReindexV2Job < ActiveJob::Base
     RECORD_NOT_FOUND_CLASSES = [
       "ActiveRecord::RecordNotFound",
-      "Mongoid::Errors::DocumentNotFound",
-      "NoBrainer::Error::DocumentNotFound",
-      "Cequel::Record::RecordNotFound"
+      "Mongoid::Errors::DocumentNotFound"
     ]
 
     queue_as { Searchkick.queue_name }
diff --git a/lib/searchkick/results.rb b/lib/searchkick/results.rb
index c02480d..da44598 100644
--- a/lib/searchkick/results.rb
+++ b/lib/searchkick/results.rb
@@ -309,16 +309,7 @@ module Searchkick
         combine_includes(included_relations, options[:includes])
         combine_includes(included_relations, options[:model_includes][records]) if options[:model_includes]
 
-        records =
-          if defined?(NoBrainer::Document) && records < NoBrainer::Document
-            if Gem.loaded_specs["nobrainer"].version >= Gem::Version.new("0.21")
-              records.eager_load(included_relations)
-            else
-              records.preload(included_relations)
-            end
-          else
-            records.includes(included_relations)
-          end
+        records = records.includes(included_relations)
       end
 
       if options[:scope_results]
diff --git a/test/boost_test.rb b/test/boost_test.rb
index bc6040c..79d9083 100644
--- a/test/boost_test.rb
+++ b/test/boost_test.rb
@@ -171,8 +171,6 @@ class BoostTest < Minitest::Test
   end
 
   def test_boost_by_indices
-    skip if cequel?
-
     store_names ["Rex"], Animal
     store_names ["Rexx"], Product
 
diff --git a/test/index_test.rb b/test/index_test.rb
index bcc3ad6..e1e40a6 100644
--- a/test/index_test.rb
+++ b/test/index_test.rb
@@ -87,7 +87,6 @@ class IndexTest < Minitest::Test
   end
 
   def test_large_value
-    skip if nobrainer?
     large_value = 1000.times.map { "hello" }.join(" ")
     store [{name: "Product A", text: large_value}], Region
     assert_search "product", ["Product A"], {}, Region
@@ -97,7 +96,6 @@ class IndexTest < Minitest::Test
   end
 
   def test_very_large_value
-    skip if nobrainer?
     large_value = 10000.times.map { "hello" }.join(" ")
     store [{name: "Product A", text: large_value}], Region
     assert_search "product", ["Product A"], {}, Region
diff --git a/test/inheritance_test.rb b/test/inheritance_test.rb
index 83792cc..579a570 100644
--- a/test/inheritance_test.rb
+++ b/test/inheritance_test.rb
@@ -1,11 +1,6 @@
 require_relative "test_helper"
 
 class InheritanceTest < Minitest::Test
-  def setup
-    skip if cequel?
-    super
-  end
-
   def test_child_reindex
     store_names ["Max"], Cat
     assert Dog.reindex
diff --git a/test/order_test.rb b/test/order_test.rb
index 3cb0a2e..f9afaf9 100644
--- a/test/order_test.rb
+++ b/test/order_test.rb
@@ -14,8 +14,6 @@ class OrderTest < Minitest::Test
   # TODO no longer map id to _id in Searchkick 5
   # since sorting on _id is deprecated in Elasticsearch
   def test_id
-    skip if cequel?
-
     store_names ["Product A", "Product B"]
     product_a = Product.where(name: "Product A").first
     product_b = Product.where(name: "Product B").first
diff --git a/test/reindex_test.rb b/test/reindex_test.rb
index 7f8f299..33a3f44 100644
--- a/test/reindex_test.rb
+++ b/test/reindex_test.rb
@@ -37,8 +37,6 @@ class ReindexTest < Minitest::Test
   end
 
   def test_relation_inline
-    skip if nobrainer? || cequel?
-
     store_names ["Product A"]
     store_names ["Product B", "Product C"], reindex: false
     Product.where(name: "Product B").reindex(refresh: true)
@@ -46,8 +44,6 @@ class ReindexTest < Minitest::Test
   end
 
   def test_relation_associations
-    skip if nobrainer? || cequel?
-
     store_names ["Product A"]
     store = Store.create!(name: "Test")
     Product.create!(name: "Product B", store_id: store.id)
@@ -56,8 +52,6 @@ class ReindexTest < Minitest::Test
   end
 
   def test_relation_should_index
-    skip if nobrainer? || cequel?
-
     skip "TODO make pass in Searchkick 5"
 
     store_names ["Product A", "Product B"]
diff --git a/test/support/cequel.rb b/test/support/cequel.rb
deleted file mode 100644
index fc5bd14..0000000
--- a/test/support/cequel.rb
+++ /dev/null
@@ -1,95 +0,0 @@
-cequel =
-  Cequel.connect(
-    host: "127.0.0.1",
-    port: 9042,
-    keyspace: "searchkick_test",
-    default_consistency: :all
-  )
-cequel.logger = $logger
-cequel.schema.drop! if cequel.schema.exists?
-cequel.schema.create!
-Cequel::Record.connection = cequel
-
-class Product
-  include Cequel::Record
-
-  key :id, :uuid, auto: true
-  column :name, :text, index: true
-  column :store_id, :int
-  column :in_stock, :boolean
-  column :backordered, :boolean
-  column :orders_count, :int
-  column :found_rate, :decimal
-  column :price, :int
-  column :color, :text
-  column :latitude, :decimal
-  column :longitude, :decimal
-  column :description, :text
-  column :alt_description, :text
-  column :created_at, :timestamp
-end
-
-class Store
-  include Cequel::Record
-
-  key :id, :timeuuid, auto: true
-  column :name, :text
-
-  # has issue with id serialization
-  def search_data
-    {
-      name: name
-    }
-  end
-end
-
-class Region
-  include Cequel::Record
-
-  key :id, :timeuuid, auto: true
-  column :name, :text
-  column :text, :text
-end
-
-class Speaker
-  include Cequel::Record
-
-  key :id, :timeuuid, auto: true
-  column :name, :text
-end
-
-class Animal
-  include Cequel::Record
-
-  key :id, :timeuuid, auto: true
-  column :name, :text
-
-  # has issue with id serialization
-  def search_data
-    {
-      name: name
-    }
-  end
-end
-
-class Dog < Animal
-end
-
-class Cat < Animal
-end
-
-class Sku
-  include Cequel::Record
-
-  key :id, :uuid
-  column :name, :text
-end
-
-class Song
-  include Cequel::Record
-
-  key :id, :timeuuid, auto: true
-  column :name, :text
-end
-
-[Product, Store, Region, Speaker, Animal, Sku, Song].each(&:synchronize_schema)
diff --git a/test/support/nobrainer.rb b/test/support/nobrainer.rb
deleted file mode 100644
index a10c19a..0000000
--- a/test/support/nobrainer.rb
+++ /dev/null
@@ -1,73 +0,0 @@
-NoBrainer.configure do |config|
-  config.app_name = :searchkick
-  config.environment = :test
-end
-
-class Product
-  include NoBrainer::Document
-  include NoBrainer::Document::Timestamps
-
-  field :id,           type: Object
-  field :name,         type: Text
-  field :in_stock,     type: Boolean
-  field :backordered,  type: Boolean
-  field :orders_count, type: Integer
-  field :found_rate
-  field :price,        type: Integer
-  field :color,        type: String
-  field :latitude
-  field :longitude
-  field :description, type: String
-  field :alt_description, type: String
-
-  belongs_to :store, validates: false
-end
-
-class Store
-  include NoBrainer::Document
-
-  field :id,   type: Object
-  field :name, type: String
-end
-
-class Region
-  include NoBrainer::Document
-
-  field :id,   type: Object
-  field :name, type: String
-  field :text, type: Text
-end
-
-class Speaker
-  include NoBrainer::Document
-
-  field :id,   type: Object
-  field :name, type: String
-end
-
-class Animal
-  include NoBrainer::Document
-
-  field :id,   type: Object
-  field :name, type: String
-end
-
-class Dog < Animal
-end
-
-class Cat < Animal
-end
-
-class Sku
-  include NoBrainer::Document
-
-  field :id,   type: String
-  field :name, type: String
-end
-
-class Song
-  include NoBrainer::Document
-
-  field :id,   type: Object
-  field :name, type: String
-end
diff --git a/test/test_helper.rb b/test/test_helper.rb
index 492bd90..fe3a7c8 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -2,7 +2,6 @@ require "bundler/setup"
 Bundler.require(:default)
 require "minitest/autorun"
 require "minitest/pride"
-require "active_support/core_ext" if defined?(NoBrainer)
 require "active_support/notifications"
 
 ENV["RACK_ENV"] = "test"
@@ -47,10 +46,6 @@ ActiveSupport::LogSubscriber.logger = ActiveSupport::Logger.new(STDOUT) if ENV["
 
 if defined?(Mongoid)
   require_relative "support/mongoid"
-elsif defined?(NoBrainer)
-  require_relative "support/nobrainer"
-elsif defined?(Cequel)
-  require_relative "support/cequel"
 else
   require_relative "support/activerecord"
 end
@@ -147,14 +142,6 @@ class Minitest::Test
     defined?(ActiveRecord)
   end
 
-  def nobrainer?
-    defined?(NoBrainer)
-  end
-
-  def cequel?
-    defined?(Cequel)
-  end
-
   def default_model
     Product
   end
diff --git a/test/where_test.rb b/test/where_test.rb
index f41fd62..d0645e9 100644
--- a/test/where_test.rb
+++ b/test/where_test.rb
@@ -15,14 +15,11 @@ class WhereTest < Minitest::Test
     assert_search "product", ["Product A"], where: {user_ids: 2}
     assert_search "product", ["Product A", "Product C"], where: {user_ids: [2, 3]}
 
-    # due to precision
-    unless cequel?
-      # date
-      assert_search "product", ["Product A"], where: {created_at: {gt: now - 1}}
-      assert_search "product", ["Product A", "Product B"], where: {created_at: {gte: now - 1}}
-      assert_search "product", ["Product D"], where: {created_at: {lt: now - 2}}
-      assert_search "product", ["Product C", "Product D"], where: {created_at: {lte: now - 2}}
-    end
+    # date
+    assert_search "product", ["Product A"], where: {created_at: {gt: now - 1}}
+    assert_search "product", ["Product A", "Product B"], where: {created_at: {gte: now - 1}}
+    assert_search "product", ["Product D"], where: {created_at: {lt: now - 2}}
+    assert_search "product", ["Product C", "Product D"], where: {created_at: {lte: now - 2}}
 
     # integer
     assert_search "product", ["Product A"], where: {store_id: {lt: 2}}
--
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