diff --git a/Gemfile b/Gemfile
index 2053075..ae3cb88 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,7 +3,7 @@ source 'https://rubygems.org'
 gem 'jekyll', '4.1.1'
 
 group :jekyll_plugins do
-  gem 'jekyll-sitemap', '1.4.0'
-  gem 'jekyll-last-modified-at','1.1.0'
+  gem 'jekyll-sitemap'
+  gem 'jekyll-last-modified-at'
   gem 'jekyll-image-size'
 end
diff --git a/Gemfile.lock b/Gemfile.lock
index eda727d..2cd0d34 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -33,7 +33,7 @@ GEM
     jekyll-image-size (1.2.1)
       fastimage (>= 1.8)
       jekyll (>= 3.7)
-    jekyll-last-modified-at (1.1.0)
+    jekyll-last-modified-at (1.3.0)
       jekyll (>= 3.7, < 5.0)
       posix-spawn (~> 0.3.9)
     jekyll-sass-converter (2.1.0)
@@ -47,7 +47,7 @@ GEM
     kramdown-parser-gfm (1.1.0)
       kramdown (~> 2.0)
     liquid (4.0.3)
-    listen (3.3.1)
+    listen (3.3.3)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
     mercenary (0.4.0)
@@ -59,7 +59,7 @@ GEM
     rb-inotify (0.10.1)
       ffi (~> 1.0)
     rexml (3.2.4)
-    rouge (3.25.0)
+    rouge (3.26.0)
     safe_yaml (1.0.5)
     sassc (2.4.0)
       ffi (~> 1.9)
@@ -73,8 +73,8 @@ PLATFORMS
 DEPENDENCIES
   jekyll (= 4.1.1)
   jekyll-image-size
-  jekyll-last-modified-at (= 1.1.0)
-  jekyll-sitemap (= 1.4.0)
+  jekyll-last-modified-at
+  jekyll-sitemap
 
 BUNDLED WITH
    2.1.4