diff --git a/lib/grack/git.rb b/lib/grack/git.rb
index 8469575..7bfc54a 100644
--- a/lib/grack/git.rb
+++ b/lib/grack/git.rb
@@ -57,7 +57,7 @@ def config(config_name)
     end
 
     def valid_repo?
-      return false unless File.exists?(repo) && File.realpath(repo) == repo
+      return false unless File.exist?(repo) && File.realpath(repo) == repo
 
       match = execute(%W(rev-parse --git-dir)).match(/\.$|\.git$/)
       
diff --git a/lib/grack/server.rb b/lib/grack/server.rb
index 59e0bc2..15474e6 100644
--- a/lib/grack/server.rb
+++ b/lib/grack/server.rb
@@ -163,7 +163,7 @@ def get_text_file
     # some of this borrowed from the Rack::File implementation
     def send_file(reqfile, content_type)
       reqfile = File.join(git.repo, reqfile)
-      return render_not_found unless File.exists?(reqfile)
+      return render_not_found unless File.exist?(reqfile)
 
       return render_not_found unless reqfile == File.realpath(reqfile)