diff --git a/Gemfile.lock b/Gemfile.lock
index 60cec21..3108c8f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -13,8 +13,9 @@ GEM
     nokogiri (1.6.8)
       mini_portile2 (~> 2.1.0)
       pkg-config (~> 1.1.7)
+    nokogiri (1.6.8-java)
     pkg-config (1.1.7)
-    rake (10.4.2)
+    rake (13.0.1)
     roo (2.5.1)
       nokogiri (~> 1)
       rubyzip (~> 1.1, < 2.0.0)
@@ -46,7 +47,7 @@ PLATFORMS
 
 DEPENDENCIES
   bundler (~> 1.10)
-  rake (~> 10.1)
+  rake (~> 13.0)
   rspec (~> 3.3)
   simple-spreadsheet!
 
diff --git a/simple-spreadsheet.gemspec b/simple-spreadsheet.gemspec
index 4209324..01a56a9 100644
--- a/simple-spreadsheet.gemspec
+++ b/simple-spreadsheet.gemspec
@@ -18,7 +18,7 @@ Gem::Specification.new do |gem|
 
   # specify any dependencies here; for example:
   gem.add_development_dependency "bundler", "~> 1.10"
-  gem.add_development_dependency "rake", "~> 10.1"
+  gem.add_development_dependency "rake", "~> 13.0"
   gem.add_development_dependency "rspec","~> 3.3"
   gem.add_runtime_dependency "roo", "~> 2.4"
   gem.add_runtime_dependency "roo-xls", "~> 1.0"