diff --git a/Gemfile.lock b/Gemfile.lock
index 39b039f..e940d9f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -68,7 +68,7 @@ GEM
     public_suffix (4.0.6)
     racc (1.6.0)
     rainbow (3.0.0)
-    rake (10.5.0)
+    rake (12.3.3)
     rb-fsevent (0.11.0)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
@@ -94,7 +94,7 @@ DEPENDENCIES
   ed.!
   html-proofer
   kramdown-parser-gfm
-  rake (~> 10.4)
+  rake (~> 12.3)
   webrick (~> 1.7)
 
 BUNDLED WITH
diff --git a/ed..gemspec b/ed..gemspec
index 30acea4..457f8a1 100644
--- a/ed..gemspec
+++ b/ed..gemspec
@@ -26,5 +26,5 @@ Gem::Specification.new do |spec|
   spec.add_runtime_dependency "jekyll", "~> 3.6"
 
   spec.add_development_dependency "bundler", ">= 1.16"
-  spec.add_development_dependency "rake", "~> 10.4"
+  spec.add_development_dependency "rake", "~> 12.3"
 end