diff --git a/Gemfile.lock b/Gemfile.lock
index 73bffb5..f757b40 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)
     colorator (1.1.0)
     ffi (1.14.2)
     forwardable-extended (2.6.0)
@@ -23,7 +23,7 @@ GEM
       sass (~> 3.4)
     jekyll-watch (1.5.1)
       listen (~> 3.0)
-    kramdown (2.3.0)
+    kramdown (1.17.0)
     liquid (4.0.3)
     listen (3.4.1)
       rb-fsevent (~> 0.10, >= 0.10.3)
@@ -31,7 +31,7 @@ GEM
     mercenary (0.3.6)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
-    public_suffix (4.0.6)
+    public_suffix (5.0.0)
     rb-fsevent (0.10.4)
     rb-inotify (0.10.1)
       ffi (~> 1.0)