diff --git a/Gemfile.lock b/Gemfile.lock
index 7a5aabe5a..1995e4983 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -197,7 +197,7 @@ GEM
       sprockets (< 4.0)
     concurrent-ruby (1.1.5)
     connection_pool (2.2.1)
-    crass (1.0.4)
+    crass (1.0.6)
     cucumber (2.99.0)
       builder (>= 2.1.2)
       cucumber-core (~> 1.5.0)
@@ -420,8 +420,8 @@ GEM
     nio4r (2.2.0)
     nokogiri (1.10.3)
       mini_portile2 (~> 2.4.0)
-    nokogumbo (1.5.0)
-      nokogiri
+    nokogumbo (2.0.2)
+      nokogiri (~> 1.8, >= 1.8.4)
     notiffany (0.1.1)
       nenv (~> 0.1)
       shellany (~> 0.0)
@@ -580,10 +580,10 @@ GEM
     rubyzip (1.2.3)
     rufus-scheduler (3.4.2)
       et-orbi (~> 1.0)
-    sanitize (4.6.0)
+    sanitize (5.2.1)
       crass (~> 1.0.2)
-      nokogiri (>= 1.4.4)
-      nokogumbo (~> 1.4)
+      nokogiri (>= 1.8.0)
+      nokogumbo (~> 2.0)
     sass (3.4.25)
     sass-rails (5.0.7)
       railties (>= 4.0.0, < 6)