diff --git a/Gemfile.lock b/Gemfile.lock
index 9f44107f2..fc693b846 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -234,7 +234,7 @@ GEM
     thread_safe (0.3.6)
     typhoeus (1.4.0)
       ethon (>= 0.9.0)
-    tzinfo (1.2.9)
+    tzinfo (1.2.11)
       thread_safe (~> 0.1)
     unf (0.1.4)
       unf_ext
@@ -248,6 +248,8 @@ PLATFORMS
 DEPENDENCIES
   github-pages (~> 206)
   jekyll-feed (~> 0.12)
+  jekyll-relative-links
+  jekyll-titles-from-headings
   minima (~> 2.5)
   tzinfo (~> 1.2)
   tzinfo-data