diff --git a/test/acceptance/workspaces/ruby-app-thresholds/Gemfile b/test/acceptance/workspaces/ruby-app-thresholds/Gemfile
index 88d27cc9f0..f6fd9bb4ff 100644
--- a/test/acceptance/workspaces/ruby-app-thresholds/Gemfile
+++ b/test/acceptance/workspaces/ruby-app-thresholds/Gemfile
@@ -1,5 +1,5 @@
 source :rubygems
 
-gem "sanitize", "4.6.2"
+gem "sanitize", "5.2.1"
 gem "yard", "0.8.0"
 gem "lynx", "0.4.0"
diff --git a/test/acceptance/workspaces/ruby-app-thresholds/Gemfile.lock b/test/acceptance/workspaces/ruby-app-thresholds/Gemfile.lock
index 1471006e88..04de938748 100644
--- a/test/acceptance/workspaces/ruby-app-thresholds/Gemfile.lock
+++ b/test/acceptance/workspaces/ruby-app-thresholds/Gemfile.lock
@@ -1,17 +1,17 @@
 GEM
   remote: http://rubygems.org/
   specs:
-    crass (1.0.4)
+    crass (1.0.6)
     lynx (0.4.0)
-    mini_portile2 (2.3.0)
-    nokogiri (1.8.5)
-      mini_portile2 (~> 2.3.0)
-    nokogumbo (1.5.0)
-      nokogiri
-    sanitize (4.6.2)
+    mini_portile2 (2.4.0)
+    nokogiri (1.10.9)
+      mini_portile2 (~> 2.4.0)
+    nokogumbo (2.0.2)
+      nokogiri (~> 1.8, >= 1.8.4)
+    sanitize (5.2.1)
       crass (~> 1.0.2)
-      nokogiri (>= 1.4.4)
-      nokogumbo (~> 1.4)
+      nokogiri (>= 1.8.0)
+      nokogumbo (~> 2.0)
     yard (0.8.0)
 
 PLATFORMS
@@ -19,8 +19,8 @@ PLATFORMS
 
 DEPENDENCIES
   lynx (= 0.4.0)
-  sanitize (= 4.6.2)
+  sanitize (= 5.2.1)
   yard (= 0.8.0)
 
 BUNDLED WITH
-   1.16.5
+   1.17.3