diff --git a/Gemfile.lock b/Gemfile.lock
index 35df608..1290879 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -31,6 +31,8 @@ GEM
       terminal-table (~> 1.8)
     jekyll-sass-converter (2.1.0)
       sassc (> 2.0.1, < 3.0)
+    jekyll-seo-tag (2.7.1)
+      jekyll (>= 3.8, < 5.0)
     jekyll-watch (2.2.1)
       listen (~> 3.0)
     kramdown (2.2.1)
@@ -48,7 +50,7 @@ GEM
     rb-fsevent (0.10.4)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rexml (3.2.4)
+    rexml (3.2.5)
     rouge (3.20.0)
     safe_yaml (1.0.5)
     sassc (2.4.0)
@@ -62,6 +64,7 @@ PLATFORMS
 
 DEPENDENCIES
   jekyll (~> 4.1)
+  jekyll-seo-tag
 
 BUNDLED WITH
    2.1.4