diff --git a/Gemfile.lock b/Gemfile.lock
index 541a50b..4d011e3 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -9,7 +9,7 @@ GEM
   remote: https://rubygems.org/
   specs:
     chunky_png (1.3.11)
-    rake (10.5.0)
+    rake (13.0.1)
     rmagick (3.1.0)
     rqrcode (0.10.1)
       chunky_png (~> 1.0)
@@ -20,7 +20,7 @@ PLATFORMS
 DEPENDENCIES
   bundler (~> 2.0)
   cuterb!
-  rake (~> 10.0)
+  rake (~> 13.0)
 
 BUNDLED WITH
    2.0.1
diff --git a/cuterb.gemspec b/cuterb.gemspec
index 2ef3e71..2d1cda4 100644
--- a/cuterb.gemspec
+++ b/cuterb.gemspec
@@ -37,7 +37,7 @@ Gem::Specification.new do |spec|
   spec.require_paths = ["lib"]
 
   spec.add_development_dependency "bundler", "~> 2.0"
-  spec.add_development_dependency "rake", "~> 10.0"
+  spec.add_development_dependency "rake", "~> 13.0"
 
   spec.add_runtime_dependency "rqrcode"
   spec.add_runtime_dependency "rmagick"