diff --git a/Gemfile.lock b/Gemfile.lock
index aaca15c..fa60c06 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -38,7 +38,7 @@ GEM
     colorator (1.1.0)
     commonmarker (0.17.13)
       ruby-enum (~> 0.5)
-    concurrent-ruby (1.1.7)
+    concurrent-ruby (1.1.8)
     crass (1.0.6)
     em-websocket (0.5.2)
       eventmachine (>= 0.12.9)
@@ -123,8 +123,8 @@ GEM
       jekyll (>= 3.7, < 5.0)
     jekyll-titles-from-headings (0.5.3)
       jekyll (>= 3.3, < 5.0)
-    jekyll-toc (0.16.1)
-      jekyll (>= 3.8)
+    jekyll-toc (0.17.0)
+      jekyll (>= 3.9)
       nokogiri (~> 1.10)
     jekyll-watch (2.2.1)
       listen (~> 3.0)