diff --git a/backend/Gemfile.lock b/backend/Gemfile.lock
index d9ce716..a11fd84 100644
--- a/backend/Gemfile.lock
+++ b/backend/Gemfile.lock
@@ -102,7 +102,7 @@ GEM
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
       ruby_dep (~> 1.2)
-    loofah (2.5.0)
+    loofah (2.19.1)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     mail (2.7.1)
@@ -112,7 +112,7 @@ GEM
     method_source (1.0.0)
     mimemagic (0.3.5)
     mini_mime (1.0.2)
-    mini_portile2 (2.4.0)
+    mini_portile2 (2.8.0)
     minitest (5.14.0)
     msgpack (1.3.3)
     msgpack (1.3.3-java)
@@ -120,13 +120,15 @@ GEM
     msgpack (1.3.3-x86-mingw32)
     nio4r (2.5.2)
     nio4r (2.5.2-java)
-    nokogiri (1.10.9)
-      mini_portile2 (~> 2.4.0)
-    nokogiri (1.10.9-java)
-    nokogiri (1.10.9-x64-mingw32)
-      mini_portile2 (~> 2.4.0)
-    nokogiri (1.10.9-x86-mingw32)
-      mini_portile2 (~> 2.4.0)
+    nokogiri (1.13.10)
+      mini_portile2 (~> 2.8.0)
+      racc (~> 1.4)
+    nokogiri (1.13.10-java)
+      racc (~> 1.4)
+    nokogiri (1.13.10-x64-mingw32)
+      racc (~> 1.4)
+    nokogiri (1.13.10-x86-mingw32)
+      racc (~> 1.4)
     pg (1.2.3)
     pg (1.2.3-x64-mingw32)
     pg (1.2.3-x86-mingw32)
@@ -135,6 +137,8 @@ GEM
       nio4r (~> 2.0)
     puma (4.3.3-java)
       nio4r (~> 2.0)
+    racc (1.6.1)
+    racc (1.6.1-java)
     rack (2.2.2)
     rack-cors (1.1.1)
       rack (>= 2.0.0)
@@ -160,8 +164,8 @@ GEM
     rails-dom-testing (2.0.3)
       activesupport (>= 4.2.0)
       nokogiri (>= 1.6)
-    rails-html-sanitizer (1.3.0)
-      loofah (~> 2.3)
+    rails-html-sanitizer (1.4.4)
+      loofah (~> 2.19, >= 2.19.1)
     railties (6.0.3)
       actionpack (= 6.0.3)
       activesupport (= 6.0.3)