Gemfile.lock in sugar_png-0.5.0 vs Gemfile.lock in sugar_png-0.5.1

@@ -44,11 +44,11 @@
       multi_json (~> 1.3)
       multi_xml (~> 0.5)
       rack (>= 1.2, < 3)
     psych (3.1.0)
     rack (2.1.1)
-    rainbow (2.0.0)
+    rainbow (3.0.0)
     rake (13.0.1)
     rdoc (6.2.1)
     rspec (3.9.0)
       rspec-core (~> 3.9.0)
       rspec-expectations (~> 3.9.0)
@@ -65,21 +65,21 @@
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.9.0)
     rspec-support (3.9.2)
     semver2 (3.4.2)
     thread_safe (0.3.6)
-    zpng (0.3.0)
-      rainbow (~> 2.0.0)
+    zpng (0.3.1)
+      rainbow
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
   awesome_print
   bundler (~> 2.1.4)
   jeweler (~> 2.3.9)
   rspec (~> 3.9.0)
   rspec-its (~> 1.3.0)
-  zpng (>= 0.3.0)
+  zpng (>= 0.3.1)
 
 BUNDLED WITH
    2.1.4