diff --git a/backend/Gemfile.lock b/backend/Gemfile.lock
index 9c77271..1e1f9a0 100644
--- a/backend/Gemfile.lock
+++ b/backend/Gemfile.lock
@@ -87,7 +87,7 @@ GEM
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
       ruby_dep (~> 1.2)
-    loofah (2.4.0)
+    loofah (2.18.0)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     mail (2.7.1)
@@ -134,7 +134,7 @@ GEM
     rails-dom-testing (2.0.3)
       activesupport (>= 4.2.0)
       nokogiri (>= 1.6)
-    rails-html-sanitizer (1.3.0)
+    rails-html-sanitizer (1.4.3)
       loofah (~> 2.3)
     railties (6.0.2.1)
       actionpack (= 6.0.2.1)