diff --git a/components/courses/Gemfile.lock b/components/courses/Gemfile.lock
index bfae76f1..760d0d64 100644
--- a/components/courses/Gemfile.lock
+++ b/components/courses/Gemfile.lock
@@ -52,8 +52,8 @@ GEM
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
-    addressable (2.6.0)
-      public_suffix (>= 2.0.2, < 4.0)
+    addressable (2.8.0)
+      public_suffix (>= 2.0.2, < 5.0)
     arel (9.0.0)
     builder (3.2.4)
     capybara (3.15.0)
@@ -142,7 +142,7 @@ GEM
       method_source (~> 0.9.0)
     pry-rails (0.3.9)
       pry (>= 0.10.4)
-    public_suffix (3.0.3)
+    public_suffix (4.0.6)
     racc (1.5.2)
     rack (2.2.3)
     rack-test (1.1.0)