diff --git a/Gemfile.lock b/Gemfile.lock
index e6b3ac7..f500bd2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -8,7 +8,8 @@ GEM
       addressable (>= 2.1.1)
       eventmachine (>= 0.12.9)
     eventmachine (1.0.1)
-    haml (4.0.0)
+    haml (5.0.0)
+      temple (>= 0.8.0)
       tilt
     rack (1.5.2)
     rspec (2.14.1)
@@ -19,6 +20,7 @@ GEM
     rspec-expectations (2.14.0)
       diff-lcs (>= 1.1.3, < 2.0)
     rspec-mocks (2.14.1)
+    temple (0.8.2)
     thin (1.5.0)
       daemons (>= 1.0.9)
       eventmachine (>= 0.12.6)
diff --git a/pssh.gemspec b/pssh.gemspec
index a8d54eb..ded3b3f 100644
--- a/pssh.gemspec
+++ b/pssh.gemspec
@@ -18,7 +18,7 @@ Gem::Specification.new do |gem|
   gem.add_dependency 'rack', '~> 1.5.2'
   gem.add_dependency 'thin', '~> 1.5.0'
   gem.add_dependency 'websocket-rack', '~> 0.4.0'
-  gem.add_dependency 'haml', '~> 4.0.0'
+  gem.add_dependency 'haml', '>= 4.0', '< 5.2'
   gem.add_dependency 'tilt', '~> 1.4.1'
 
 end