diff --git a/Gemfile.lock b/Gemfile.lock
index f7ebf66..30dc60d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -35,7 +35,8 @@ GEM
       jekyll (>= 3.3, < 5.0)
     jekyll-watch (2.2.1)
       listen (~> 3.0)
-    kramdown (1.17.0)
+    kramdown (2.4.0)
+      rexml
     liquid (4.0.3)
     listen (3.1.5)
       rb-fsevent (~> 0.9, >= 0.9.4)
@@ -52,6 +53,7 @@ GEM
     rb-fsevent (0.10.3)
     rb-inotify (0.10.0)
       ffi (~> 1.0)
+    rexml (3.2.5)
     rouge (3.8.0)
     ruby_dep (1.5.0)
     safe_yaml (1.0.5)
@@ -61,7 +63,7 @@ GEM
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
     thread_safe (0.3.6)
-    tzinfo (1.2.5)
+    tzinfo (1.2.10)
       thread_safe (~> 0.1)
     tzinfo-data (1.2019.2)
       tzinfo (>= 1.0.0)