diff --git a/Gemfile.lock b/Gemfile.lock
index 99e75cf..9bdf3a9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,14 +1,16 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.7.0)
+    addressable (2.8.0)
       public_suffix (>= 2.0.2, < 5.0)
     colorator (1.1.0)
     concurrent-ruby (1.1.6)
     em-websocket (0.5.1)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0.6.0)
+    eventmachine (1.2.7)
     eventmachine (1.2.7-x64-mingw32)
+    ffi (1.12.2)
     ffi (1.12.2-x64-mingw32)
     forwardable-extended (2.6.0)
     http_parser.rb (0.6.0)
@@ -35,8 +37,6 @@ GEM
       sassc (> 2.0.1, < 3.0)
     jekyll-seo-tag (2.6.1)
       jekyll (>= 3.3, < 5.0)
-    jekyll-titles-from-headings (0.5.3)
-      jekyll (>= 3.3, < 5.0)
     jekyll-watch (2.2.1)
       listen (~> 3.0)
     kramdown (2.2.1)
@@ -54,13 +54,15 @@ GEM
       jekyll-seo-tag (~> 2.1)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
-    public_suffix (4.0.4)
+    public_suffix (4.0.6)
     rb-fsevent (0.10.3)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
     rexml (3.2.4)
     rouge (3.18.0)
     safe_yaml (1.0.5)
+    sassc (2.3.0)
+      ffi (~> 1.9)
     sassc (2.3.0-x64-mingw32)
       ffi (~> 1.9)
     terminal-table (1.8.0)
@@ -75,11 +77,11 @@ GEM
 
 PLATFORMS
   x64-mingw32
+  x86_64-linux
 
 DEPENDENCIES
   jekyll (~> 4.0.0)
   jekyll-feed (~> 0.12)
-  jekyll-titles-from-headings
   minima (~> 2.5)
   tzinfo (~> 1.2)
   tzinfo-data