diff --git a/docs/guides/Gemfile.lock b/docs/guides/Gemfile.lock
index 0459ad5d..b767f149 100644
--- a/docs/guides/Gemfile.lock
+++ b/docs/guides/Gemfile.lock
@@ -2,8 +2,8 @@ GEM
   remote: https://rubygems.org/
   specs:
     Ascii85 (1.0.2)
-    addressable (2.5.2)
-      public_suffix (>= 2.0.2, < 4.0)
+    addressable (2.8.0)
+      public_suffix (>= 2.0.2, < 5.0)
     afm (0.2.2)
     asciidoctor (1.5.6.1)
     asciidoctor-epub3 (1.5.0.alpha.7)
@@ -79,7 +79,7 @@ GEM
     pry (0.11.3)
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
-    public_suffix (3.0.1)
+    public_suffix (4.0.6)
     rake (12.3.0)
     rb-fsevent (0.10.2)
     rb-inotify (0.9.10)