diff --git a/Gemfile b/Gemfile
index 7e604be5..60e84cc7 100644
--- a/Gemfile
+++ b/Gemfile
@@ -11,7 +11,7 @@ gem "image_optim"
 gem "jekyll-assets"
 gem "jekyll-feed"
 gem "jekyll-gist"
-gem "jekyll-last-modified-at"
+gem "jekyll-last-modified-at", ">= 1.3.2"
 gem "jekyll-paginate-v2"
 gem "jekyll-redirect-from"
 gem "jekyll-seo-tag"
diff --git a/Gemfile.lock b/Gemfile.lock
index 8193ca12..cfba6be2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -6,8 +6,8 @@ GEM
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
-    addressable (2.7.0)
-      public_suffix (>= 2.0.2, < 5.0)
+    addressable (2.8.6)
+      public_suffix (>= 2.0.2, < 6.0)
     amp-jekyll (1.0.3)
       fastimage (>= 1.8.0)
       jekyll (>= 3.0, < 5.0)
@@ -15,11 +15,11 @@ GEM
     autoprefixer-rails (9.8.6.1)
       execjs
     colorator (1.1.0)
-    concurrent-ruby (1.1.7)
+    concurrent-ruby (1.3.1)
     crass (1.0.6)
-    em-websocket (0.5.1)
+    em-websocket (0.5.3)
       eventmachine (>= 0.12.9)
-      http_parser.rb (~> 0.6.0)
+      http_parser.rb (~> 0)
     ethon (0.12.0)
       ffi (>= 1.3.0)
     eventmachine (1.2.7)
@@ -30,7 +30,7 @@ GEM
     faraday (1.0.1)
       multipart-post (>= 1.2, < 3)
     fastimage (2.2.0)
-    ffi (1.13.1)
+    ffi (1.17.0)
     font-awesome-sass (5.13.0)
       sassc (>= 1.11)
     forwardable-extended (2.6.0)
@@ -47,8 +47,8 @@ GEM
       rainbow (~> 3.0)
       typhoeus (~> 1.3)
       yell (~> 2.0)
-    http_parser.rb (0.6.0)
-    i18n (0.9.5)
+    http_parser.rb (0.8.0)
+    i18n (1.14.5)
       concurrent-ruby (~> 1.0)
     image_optim (0.26.5)
       exifr (~> 1.2, >= 1.2.2)
@@ -62,11 +62,11 @@ GEM
       image_optim (~> 0.19)
     image_size (2.1.0)
     in_threads (1.5.4)
-    jekyll (3.9.0)
+    jekyll (3.9.5)
       addressable (~> 2.4)
       colorator (~> 1.0)
       em-websocket (~> 0.5)
-      i18n (~> 0.7)
+      i18n (>= 0.7, < 2)
       jekyll-sass-converter (~> 1.0)
       jekyll-watch (~> 2.0)
       kramdown (>= 1.17, < 3)
@@ -90,9 +90,8 @@ GEM
       jekyll (>= 3.7, < 5.0)
     jekyll-gist (1.5.0)
       octokit (~> 4.2)
-    jekyll-last-modified-at (1.3.0)
+    jekyll-last-modified-at (1.3.2)
       jekyll (>= 3.7, < 5.0)
-      posix-spawn (~> 0.3.9)
     jekyll-paginate-v2 (3.0.0)
       jekyll (>= 3.0, < 5.0)
     jekyll-redirect-from (0.16.0)
@@ -113,15 +112,15 @@ GEM
       gemoji (~> 3.0)
       html-pipeline (~> 2.2)
       jekyll (>= 3.0, < 5.0)
-    kramdown (2.3.0)
+    kramdown (2.4.0)
       rexml
     kramdown-parser-gfm (1.1.0)
       kramdown (~> 2.0)
-    liquid (4.0.3)
+    liquid (4.0.4)
     liquid-tag-parser (1.9.0)
       extras (~> 0.3)
       liquid (>= 3.0, < 5.0)
-    listen (3.2.1)
+    listen (3.9.0)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
     mercenary (0.3.6)
@@ -139,17 +138,17 @@ GEM
     parallel (1.19.2)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
-    posix-spawn (0.3.15)
     progress (3.5.2)
-    public_suffix (4.0.5)
+    public_suffix (5.0.5)
     rack (2.2.3)
     rainbow (3.0.0)
     rake (13.0.1)
-    rb-fsevent (0.10.4)
-    rb-inotify (0.10.1)
+    rb-fsevent (0.11.2)
+    rb-inotify (0.11.1)
       ffi (~> 1.0)
-    rexml (3.2.4)
-    rouge (3.22.0)
+    rexml (3.2.8)
+      strscan (>= 3.0.9)
+    rouge (3.30.0)
     safe_yaml (1.0.5)
     sanitize (5.2.1)
       crass (~> 1.0.2)
@@ -168,6 +167,7 @@ GEM
     sprockets (4.0.0.beta8)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
+    strscan (3.1.0)
     thread_safe (0.3.6)
     typhoeus (1.4.0)
       ethon (>= 0.9.0)
@@ -193,7 +193,7 @@ DEPENDENCIES
   jekyll-assets
   jekyll-feed
   jekyll-gist
-  jekyll-last-modified-at
+  jekyll-last-modified-at (>= 1.3.2)
   jekyll-paginate-v2
   jekyll-redirect-from
   jekyll-seo