diff --git a/backend/Gemfile b/backend/Gemfile
index c3205ca6..b22e2f01 100644
--- a/backend/Gemfile
+++ b/backend/Gemfile
@@ -13,7 +13,7 @@ gem "rake"
 gem "active_model_serializers", "0.9.8"
 
 # Use postgresql and mongo as the database for Active Record
-gem "mongoid", "7.3.3"
+gem "mongoid", "8.1.4"
 gem "pg", "1.2.3"
 
 # Use Puma as the app server
diff --git a/backend/Gemfile.lock b/backend/Gemfile.lock
index f4891247..a738a11b 100644
--- a/backend/Gemfile.lock
+++ b/backend/Gemfile.lock
@@ -84,8 +84,8 @@ GEM
       erubi (~> 1.4)
       parser (>= 2.4)
       smart_properties
-    bson (4.12.1)
-    bson (4.12.1-java)
+    bson (4.15.0)
+    bson (4.15.0-java)
     bugsnag (6.26.0)
       concurrent-ruby (~> 1.0)
     builder (3.2.4)
@@ -218,11 +218,12 @@ GEM
     mini_mime (1.1.5)
     mini_portile2 (2.8.4)
     minitest (5.20.0)
-    mongo (2.16.0)
-      bson (>= 4.8.2, < 5.0.0)
-    mongoid (7.3.3)
-      activemodel (>= 5.1, < 6.2)
-      mongo (>= 2.10.5, < 3.0.0)
+    mongo (2.19.3)
+      bson (>= 4.14.1, < 5.0.0)
+    mongoid (8.1.4)
+      activemodel (>= 5.1, < 7.2, != 7.0.0)
+      concurrent-ruby (>= 1.0.5, < 2.0)
+      mongo (>= 2.18.0, < 3.0.0)
       ruby2_keywords (~> 0.0.5)
     mongoid-compatibility (0.5.1)
       activesupport
@@ -495,7 +496,7 @@ DEPENDENCIES
   kaminari-actionview
   kaminari-mongoid
   letter_opener
-  mongoid (= 7.3.3)
+  mongoid (= 8.1.4)
   mongoid-rspec
   nearest_time_zone
   omniauth (= 1.8.1)