diff --git a/backend/Gemfile.lock b/backend/Gemfile.lock
index c2e21e9c..dba9dfcf 100644
--- a/backend/Gemfile.lock
+++ b/backend/Gemfile.lock
@@ -73,7 +73,7 @@ GEM
     byebug (11.0.1)
     coderay (1.1.2)
     concurrent-ruby (1.1.5)
-    crass (1.0.5)
+    crass (1.0.6)
     declarative (0.0.10)
     declarative-option (0.1.0)
     diff-lcs (1.3)
@@ -149,7 +149,7 @@ GEM
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
       ruby_dep (~> 1.2)
-    loofah (2.4.0)
+    loofah (2.19.1)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     lumberjack (1.0.13)
@@ -159,17 +159,20 @@ GEM
       mimemagic (~> 0.3.2)
     memoist (0.16.2)
     method_source (0.9.2)
-    mimemagic (0.3.3)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mini_mime (1.0.2)
-    mini_portile2 (2.4.0)
+    mini_portile2 (2.6.1)
     minitest (5.14.0)
     msgpack (1.3.1)
     multi_json (1.14.1)
     multipart-post (2.1.1)
     nenv (0.3.0)
     nio4r (2.5.2)
-    nokogiri (1.10.7)
-      mini_portile2 (~> 2.4.0)
+    nokogiri (1.12.5)
+      mini_portile2 (~> 2.6.1)
+      racc (~> 1.4)
     notiffany (0.1.3)
       nenv (~> 0.1)
       shellany (~> 0.0)
@@ -185,6 +188,7 @@ GEM
     puma (3.12.1)
     pundit (2.1.0)
       activesupport (>= 3.0.0)
+    racc (1.6.1)
     rack (2.1.1)
     rack-cors (1.1.0)
       rack (>= 2.0.0)