diff --git a/Gemfile b/Gemfile
index 5ff75da1f..ca9c3747c 100644
--- a/Gemfile
+++ b/Gemfile
@@ -27,7 +27,7 @@ gem "mail-notify"
 gem "mlanett-redis-lock"
 gem "momentjs-rails"
 gem "mongo"
-gem "mongoid", "8.1.4" # Locked as Mongoid 8.1.5 changes validation behaviour https://github.com/mongodb/mongoid/releases/tag/v8.1.5
+gem "mongoid", "9.0.3" # Locked as Mongoid 8.1.5 changes validation behaviour https://github.com/mongodb/mongoid/releases/tag/v8.1.5
 gem "mongoid-sadstory"
 gem "mousetrap-rails"
 gem "nested_form", git: "https://github.com/alphagov/nested_form.git", branch: "add-wrapper-class"
diff --git a/Gemfile.lock b/Gemfile.lock
index 6de667f1d..f03157266 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -127,7 +127,7 @@ GEM
       sassc (>= 2.0.0)
     brakeman (6.1.2)
       racc
-    bson (4.15.0)
+    bson (5.0.2)
     builder (3.3.0)
     byebug (11.1.3)
     capybara (3.40.0)
@@ -379,11 +379,10 @@ GEM
       railties (>= 3.1)
     mongo (2.20.1)
       bson (>= 4.14.1, < 6.0.0)
-    mongoid (8.1.4)
-      activemodel (>= 5.1, < 7.2, != 7.0.0)
+    mongoid (9.0.3)
+      activemodel (>= 5.1, < 8.1, != 7.0.0)
       concurrent-ruby (>= 1.0.5, < 2.0)
       mongo (>= 2.18.0, < 3.0.0)
-      ruby2_keywords (~> 0.0.5)
     mongoid-sadstory (0.0.2)
       mongoid
     mousetrap-rails (1.4.6)
@@ -906,7 +905,7 @@ DEPENDENCIES
   mocha
   momentjs-rails
   mongo
-  mongoid (= 8.1.4)
+  mongoid (= 9.0.3)
   mongoid-sadstory
   mousetrap-rails
   nested_form!