diff --git a/Gemfile b/Gemfile
index e68ac55..4ade55f 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,6 +4,7 @@ gem 'jekyll-seo-tag', group: :jekyll_plugins
 gem "jekyll-gravatar", "~> 0.1.0", group: :jekyll_plugins
 gem "jekyll-assets", "~> 3.0.12", group: :jekyll_plugins
 gem 'sprockets-es6'
+gem 'sprockets', "~> 3.7"
 
 gem "bootstrap", ">= 4.3.1"
 gem "font-awesome-sass", "~> 5.12"
diff --git a/Gemfile.lock b/Gemfile.lock
index 76c139f..2771d44 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -43,7 +43,7 @@ GEM
     execjs (2.7.0)
     extras (0.3.0)
       forwardable-extended (~> 2.5)
-    fastimage (2.1.5)
+    fastimage (2.1.7)
     ffi (1.12.2)
     font-awesome-sass (5.12.0)
       sassc (>= 1.11)
@@ -140,7 +140,7 @@ GEM
       sprockets (> 3.0)
       sprockets-rails
       tilt
-    sprockets (4.0.0)
+    sprockets (3.7.2)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
     sprockets-es6 (0.9.2)
@@ -167,6 +167,7 @@ DEPENDENCIES
   jekyll-gravatar (~> 0.1.0)
   jekyll-seo-tag
   jekyll-sitemap
+  sprockets (~> 3.7)
   sprockets-es6
 
 BUNDLED WITH