diff --git a/Gemfile.lock b/Gemfile.lock
index 32cfa4a..6b00f2d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -8,7 +8,7 @@ PATH
       draper (~> 1.3)
       fluentd (>= 0.10.56, < 0.14)
       font-awesome-rails
-      haml-rails (~> 0.5.3)
+      haml-rails (~> 1.0)
       httpclient (~> 2.5)
       jbuilder (~> 2.0)
       jquery-rails (~> 3.1.0)
@@ -132,15 +132,22 @@ GEM
       railties (>= 3.2, < 6.0)
     globalid (0.4.1)
       activesupport (>= 4.2.0)
-    haml (4.0.7)
+    haml (5.0.4)
+      temple (>= 0.8.0)
       tilt
-    haml-rails (0.5.3)
+    haml-rails (1.0.0)
       actionpack (>= 4.0.1)
       activesupport (>= 4.0.1)
-      haml (>= 3.1, < 5.0)
+      haml (>= 4.0.6, < 6.0)
+      html2haml (>= 1.0.1)
       railties (>= 4.0.1)
     hike (1.2.3)
     hitimes (1.2.6)
+    html2haml (2.2.0)
+      erubis (~> 2.7.0)
+      haml (>= 4.0, < 6)
+      nokogiri (>= 1.6.0)
+      ruby_parser (~> 3.5)
     http-cookie (1.0.3)
       domain_name (~> 0.5)
     http_parser.rb (0.6.0)
@@ -249,6 +256,8 @@ GEM
       rspec-mocks (~> 3.5.0)
       rspec-support (~> 3.5.0)
     rspec-support (3.5.0)
+    ruby_parser (3.11.0)
+      sexp_processor (~> 4.9)
     rubyzip (1.2.1)
     safe_yaml (1.0.4)
     sass (3.2.19)
@@ -258,6 +267,7 @@ GEM
       sprockets (~> 2.8, < 3.0)
       sprockets-rails (~> 2.0)
     settingslogic (2.0.9)
+    sexp_processor (4.11.0)
     sigdump (0.2.4)
     simplecov (0.16.1)
       docile (~> 1.1)
@@ -277,6 +287,7 @@ GEM
     string-scrub (0.0.5)
     sucker_punch (1.6.0)
       celluloid (~> 0.17.2)
+    temple (0.8.0)
     thor (0.20.0)
     thread_safe (0.3.6)
     tilt (1.4.1)
diff --git a/fluentd-ui.gemspec b/fluentd-ui.gemspec
index ac9845b..9b33897 100644
--- a/fluentd-ui.gemspec
+++ b/fluentd-ui.gemspec
@@ -30,7 +30,7 @@ Gem::Specification.new do |spec|
   spec.add_dependency 'addressable'
   spec.add_dependency "font-awesome-rails"
   spec.add_dependency 'sass-rails', '~> 4.0.3'
-  spec.add_dependency "haml-rails", "~> 0.5.3"
+  spec.add_dependency "haml-rails", "~> 1.0"
   spec.add_dependency 'jquery-rails', "~> 3.1.0"
   spec.add_dependency 'jbuilder', '~> 2.0'
   spec.add_dependency "draper", '~> 1.3'