diff --git a/Gemfile b/Gemfile
index c139d31..936345e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,7 +4,7 @@ gem 'sinatra', '~> 1.4.5'
 gem 'github_api', '~> 0.13.0'
 gem "redis", "~> 3.3.3"
 gem 'hiredis', '~> 0.6.0'
-gem 'haml', '~> 4.0.6'
+gem 'haml', '~> 5.1.1'
 gem 'json', '~> 2.1'
 gem 'sidekiq', '~> 5.0.4'
 gem 'mail', '~> 2.6.6'
diff --git a/Gemfile.lock b/Gemfile.lock
index d679555..08f9c6a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -17,7 +17,8 @@ GEM
       hashie (>= 3.4)
       multi_json (>= 1.7.5, < 2.0)
       oauth2
-    haml (4.0.7)
+    haml (5.1.1)
+      temple (>= 0.8.0)
       tilt
     hashie (3.4.3)
     hiredis (0.6.1)
@@ -68,8 +69,9 @@ GEM
       rack-test
       sinatra (~> 1.4.0)
       tilt (>= 1.3, < 3)
+    temple (0.8.1)
     thread_safe (0.3.5)
-    tilt (2.0.7)
+    tilt (2.0.9)
 
 PLATFORMS
   ruby
@@ -77,7 +79,7 @@ PLATFORMS
 DEPENDENCIES
   dogstatsd-ruby (~> 3.0.0)
   github_api (~> 0.13.0)
-  haml (~> 4.0.6)
+  haml (~> 5.1.1)
   hiredis (~> 0.6.0)
   json (~> 2.1)
   mail (~> 2.6.6)