diff --git a/Gemfile.lock b/Gemfile.lock
index 83b552d..749d74b 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 (2.9.0)
+      public_suffix (>= 2.0.2, < 8.0)
     colorator (1.1.0)
     concurrent-ruby (1.1.5)
     em-websocket (0.5.1)
@@ -35,6 +35,8 @@ GEM
       jekyll (>= 3.0, < 5.0)
     jekyll-sass-converter (1.5.2)
       sass (~> 3.4)
+    jekyll-seo-tag (2.8.0)
+      jekyll (>= 3.8, < 5.0)
     jekyll-watch (2.2.1)
       listen (~> 3.0)
     kramdown (1.17.0)
@@ -45,7 +47,7 @@ GEM
     mercenary (0.3.6)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
-    public_suffix (4.0.1)
+    public_suffix (7.0.5)
     rb-fsevent (0.10.3)
     rb-inotify (0.10.0)
       ffi (~> 1.0)
@@ -58,13 +60,13 @@ GEM
       rb-inotify (~> 0.9, >= 0.9.7)
 
 PLATFORMS
-  ruby
 
 DEPENDENCIES
   jekyll (~> 3.8)
   jekyll-feed (~> 0.12.1)
   jekyll-include-cached (~> 0.1.0)
   jekyll-optional-front-matter (~> 0.3.2)
+  jekyll-seo-tag
 
 BUNDLED WITH
    2.0.2