diff --git a/Gemfile.lock b/Gemfile.lock
index b91edc1..e116a04 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -17,10 +17,8 @@ GEM
     binding_of_caller (0.8.0)
       debug_inspector (>= 0.0.1)
     byebug (11.0.0)
-    codecov (0.1.14)
-      json
-      simplecov
-      url
+    codecov (0.5.1)
+      simplecov (>= 0.15, < 0.22)
     coderay (1.1.2)
     concurrent-ruby (1.1.4)
     config (1.7.1)
@@ -30,7 +28,7 @@ GEM
     debug_inspector (0.0.3)
     deep_merge (1.2.1)
     diff-lcs (1.3)
-    docile (1.3.1)
+    docile (1.3.5)
     domain_name (0.5.20170404)
       unf (>= 0.0.5, < 1.0.0)
     dry-configurable (0.8.1)
@@ -70,7 +68,7 @@ GEM
       concurrent-ruby (~> 1.0)
     interception (0.5)
     jaro_winkler (1.5.2)
-    json (2.1.0)
+    json (2.5.1)
     method_source (0.9.2)
     mime-types (3.1)
       mime-types-data (~> 3.2015)
@@ -135,14 +133,13 @@ GEM
       unf_ext
     unf_ext (0.0.7.5)
     unicode-display_width (1.4.1)
-    url (0.3.2)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
   bundler (~> 2.0)
-  codecov (~> 0.1.10)
+  codecov (~> 0.5.1)
   fuubar (~> 2.3.0)
   git-shell!
   pry (~> 0.12.2)
diff --git a/git-shell.gemspec b/git-shell.gemspec
index ce8d29e..8aeaa74 100644
--- a/git-shell.gemspec
+++ b/git-shell.gemspec
@@ -28,7 +28,7 @@ Gem::Specification.new do |spec|
   spec.require_paths = ['lib']
 
   spec.add_development_dependency 'bundler', '~> 2.0'
-  spec.add_development_dependency 'codecov', '~> 0.1.10'
+  spec.add_development_dependency 'codecov', '~> 0.5.1'
   spec.add_development_dependency 'fuubar', '~> 2.3.0'
   spec.add_development_dependency 'pry', '~> 0.12.2'
   spec.add_development_dependency 'pry-byebug', '~> 3.7.0'