diff --git a/.github/workflows/codecheck.yml b/.github/workflows/codecheck.yml
index 74e9f03..2fb4e6c 100644
--- a/.github/workflows/codecheck.yml
+++ b/.github/workflows/codecheck.yml
@@ -12,7 +12,9 @@ jobs:
     steps:
     - uses: actions/checkout@v2
     - uses: ruby/setup-ruby@v1
+      env: 
+        BUNDLE_NOKOGIRI___C: "--use-system-libraries"
       with:
         ruby-version: 2.7 
         bundler-cache: true
-    - run: bundle exec rubocop
\ No newline at end of file
+    - run: bundle exec rubocop
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index bb6a602..d4d18fa 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -12,7 +12,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]
-        ruby: [2.5, 2.6, 2.7]
+        ruby: [2.5, 2.6, 2.7.1]
     runs-on: ${{ matrix.os }}
 
     services:
diff --git a/Gemfile b/Gemfile
index 6de200c..a21daa0 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,7 +2,7 @@ source 'https://rubygems.org'
 
 gemspec
 
-gem 'ransack-mongoid', git: 'https://github.com/activerecord-hackery/ransack-mongoid'
+gem 'ransack-mongoid', git: 'https://github.com/jesusalc/ransack-mongoid', branch: 'rails-6-mongoid-7-ruby-2-7-0'
 
 gem 'rails', '>= 5.2', '< 6.1'
 
diff --git a/Gemfile.lock b/Gemfile.lock
index f85a85e..51da8ec 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,8 +1,9 @@
 GIT
-  remote: https://github.com/activerecord-hackery/ransack-mongoid
-  revision: bd1935293d2f285fa7cf33d2c5c90d981bf67338
+  remote: https://github.com/jesusalc/ransack-mongoid
+  revision: b7f68881081731afdfaa010499d06adc93d17d71
+  branch: rails-6-mongoid-7-ruby-2-7-0
   specs:
-    ransack-mongoid (0.1.0)
+    ransack-mongoid (0.1.1)
 
 PATH
   remote: .
diff --git a/lib/active_admin/mongoid/association/relatable.rb b/lib/active_admin/mongoid/association/relatable.rb
index 6f17a87..5868c43 100644
--- a/lib/active_admin/mongoid/association/relatable.rb
+++ b/lib/active_admin/mongoid/association/relatable.rb
@@ -11,4 +11,7 @@ def foreign_key
     return if embeds?
     foreign_key.to_sym rescue nil
   end
+
+  alias_method :association_primary_key, :foreign_key
+
 end
diff --git a/lib/active_admin/mongoid/document.rb b/lib/active_admin/mongoid/document.rb
index 8f89f92..5ab62c7 100644
--- a/lib/active_admin/mongoid/document.rb
+++ b/lib/active_admin/mongoid/document.rb
@@ -70,6 +70,14 @@ def associations
     def reflections *a
       relations *a
     end
+
+    def ransackable_scopes_skip_sanitize_args
+      []
+    end
+
+    def self.ransackable_scopes(auth_object = nil)
+      []
+    end
   end
 end
 
diff --git a/test_app/app/models/post.rb b/test_app/app/models/post.rb
index 57b9704..dfe669d 100644
--- a/test_app/app/models/post.rb
+++ b/test_app/app/models/post.rb
@@ -10,4 +10,9 @@ class Post
 
   embeds_one :author
   field :'author.city.name'
+
+  def self.ransackable_scopes(auth_object = nil)
+    [:admin_user]
+  end
+
 end