diff --git a/Gemfile.lock b/Gemfile.lock
index 7c594ab..2f758fa 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,8 +1,8 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.7.0)
-      public_suffix (>= 2.0.2, < 5.0)
+    addressable (2.8.1)
+      public_suffix (>= 2.0.2, < 6.0)
     asciidoctor (2.0.10)
     bibtex-ruby (4.4.7)
       latex-decode (~> 0.0)
@@ -64,7 +64,7 @@ GEM
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
     posix-spawn (0.3.15)
-    public_suffix (4.0.5)
+    public_suffix (5.0.0)
     pygments.rb (1.2.1)
       multi_json (>= 1.0.0)
     rb-fsevent (0.10.4)