diff --git a/Gemfile.lock b/Gemfile.lock
index 4dc95c3..41edf25 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -11,18 +11,17 @@ GEM
     addressable (2.7.0)
       public_suffix (>= 2.0.2, < 5.0)
     ansi (1.5.0)
-    ast (2.4.0)
+    ast (2.4.1)
     axiom-types (0.1.1)
       descendants_tracker (~> 0.0.4)
       ice_nine (~> 0.11.0)
       thread_safe (~> 0.3, >= 0.3.1)
-    byebug (11.1.1)
+    byebug (11.1.3)
     codeclimate-engine-rb (0.4.1)
       virtus (~> 1.0)
-    codecov (0.1.16)
+    codecov (0.1.21)
       json
       simplecov
-      url
     coercible (1.0.0)
       descendants_tracker (~> 0.0.1)
     descendants_tracker (0.0.4)
@@ -41,19 +40,19 @@ GEM
       sexp_processor (~> 4.8)
     ice_nine (0.11.2)
     jaro_winkler (1.5.4)
-    json (2.3.0)
+    json (2.3.1)
     kwalify (0.7.2)
     launchy (2.4.3)
       addressable (~> 2.3)
     minitest (5.8.5)
     minitest-around (0.5.0)
       minitest (~> 5.0)
-    parallel (1.19.1)
+    parallel (1.19.2)
     parser (2.6.5.0)
       ast (~> 2.4.0)
     path_expander (1.1.0)
     psych (3.1.0)
-    public_suffix (4.0.5)
+    public_suffix (4.0.6)
     rainbow (3.0.0)
     rake (13.0.1)
     reek (5.4.1)
@@ -70,7 +69,7 @@ GEM
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 1.4.0, < 1.7)
     ruby-progressbar (1.10.1)
-    ruby_parser (3.14.2)
+    ruby_parser (3.15.0)
       sexp_processor (~> 4.9)
     rubycritic (4.4.1)
       flay (~> 2.8)
@@ -83,7 +82,7 @@ GEM
       simplecov (>= 0.17.0)
       tty-which (~> 0.4.0)
       virtus (~> 1.0)
-    sexp_processor (4.15.0)
+    sexp_processor (4.15.1)
     simplecov (0.18.5)
       docile (~> 1.1)
       simplecov-html (~> 0.11)
@@ -97,7 +96,6 @@ GEM
     thread_safe (0.3.6)
     tty-which (0.4.2)
     unicode-display_width (1.6.1)
-    url (0.3.2)
     virtus (1.0.5)
       axiom-types (~> 0.1)
       coercible (~> 1.0)
@@ -108,7 +106,6 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  bundler (~> 2.0)
   byebug (~> 11)
   codecov (~> 0.1.16)
   minitest (~> 5.8.4)
diff --git a/lib/skunk/cli/application.rb b/lib/skunk/cli/application.rb
index 4a1646f..165d846 100644
--- a/lib/skunk/cli/application.rb
+++ b/lib/skunk/cli/application.rb
@@ -12,11 +12,15 @@ module Skunk
   module Cli
     # Knows how to execute command line commands
     class Application < RubyCritic::Cli::Application
+      COVERAGE_FILE = "coverage/.resultset.json"
+
       def initialize(argv)
         @options = Skunk::Cli::Options.new(argv)
       end
 
       def execute
+        warn_coverage_info unless File.exist?(COVERAGE_FILE)
+
         parsed_options = @options.parse.to_h
         reporter = Skunk::Cli::CommandFactory.create(parsed_options).execute
         print(reporter.status_message)
@@ -25,6 +29,13 @@ def execute
         warn "Error: #{error}"
         STATUS_ERROR
       end
+
+      private
+
+      def warn_coverage_info
+        warn "warning: Couldn't find coverage info at #{COVERAGE_FILE}."
+        warn "warning: Having no coverage metrics will make your SkunkScore worse."
+      end
     end
   end
 end
diff --git a/skunk.gemspec b/skunk.gemspec
index 113e287..aa9346a 100644
--- a/skunk.gemspec
+++ b/skunk.gemspec
@@ -41,7 +41,6 @@ Gem::Specification.new do |spec|
   spec.add_dependency "rubycritic", ">= 4.4", "< 5.0"
   spec.add_dependency "terminal-table", "~> 1.8.0"
 
-  spec.add_development_dependency "bundler", "~> 2.0"
   spec.add_development_dependency "byebug", "~> 11"
   spec.add_development_dependency "codecov", "~> 0.1.16"
   spec.add_development_dependency "minitest", "~> 5.8.4"