diff --git a/Gemfile b/Gemfile
index e2b3b1971ce49fa3d09a6ec2a5740564d75f4588..fef7758cc6075b7c44ff53f7b5e2b26ee4b6bf3b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -7,7 +7,6 @@ gem 'pkg-config', '~> 1.2'
 
 gem 'puma', '~> 3.10'
 gem 'rails', '~> 5.1.4'
-gem 'uglifier', '~> 3.2'
 
 gem 'hamlit-rails', '~> 0.2'
 gem 'pg', '~> 0.20'
diff --git a/Gemfile.lock b/Gemfile.lock
index 8293977d8de20f350f718302d69570fc3f3b33f2..14f713604551e9d172692b3be9ecfdb5f1fdf9f1 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -178,7 +178,6 @@ GEM
     et-orbi (1.0.8)
       tzinfo
     excon (0.59.0)
-    execjs (2.7.0)
     fabrication (2.18.0)
     faker (1.8.4)
       i18n (~> 0.5)
@@ -584,8 +583,6 @@ GEM
       thread_safe (~> 0.1)
     tzinfo-data (1.2017.3)
       tzinfo (>= 1.0.0)
-    uglifier (3.2.0)
-      execjs (>= 0.3.0, < 3)
     unf (0.1.4)
       unf_ext
     unf_ext (0.0.7.4)
@@ -721,7 +718,6 @@ DEPENDENCIES
   tty-prompt
   twitter-text (~> 1.14)
   tzinfo-data (~> 1.2017)
-  uglifier (~> 3.2)
   webmock (~> 3.0)
   webpacker (~> 3.0)
   webpush