diff --git a/Gemfile.lock b/Gemfile.lock
index 618a43b..c6eb173 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -37,7 +37,7 @@ GEM
     colorator (1.1.0)
     commonmarker (0.17.13)
       ruby-enum (~> 0.5)
-    concurrent-ruby (1.1.10)
+    concurrent-ruby (1.2.0)
     crass (1.0.6)
     em-websocket (0.5.3)
       eventmachine (>= 0.12.9)
@@ -145,9 +145,9 @@ GEM
       jekyll (>= 3.7, < 5.0)
     jekyll-titles-from-headings (0.5.3)
       jekyll (>= 3.3, < 5.0)
-    jekyll-toc (0.17.1)
+    jekyll-toc (0.18.0)
       jekyll (>= 3.9)
-      nokogiri (~> 1.11)
+      nokogiri (~> 1.12)
     jekyll-watch (2.2.1)
       listen (~> 3.0)
     jemoji (0.13.0)