Gemfile.lock in redlock-0.2.0 vs Gemfile.lock in redlock-0.2.1

@@ -1,10 +1,10 @@
 PATH
   remote: .
   specs:
-    redlock (0.2.0)
-      redis (~> 3, >= 3.0.0)
+    redlock (0.2.1)
+      redis (>= 3.0.0, < 5.0)
 
 GEM
   remote: https://rubygems.org/
   specs:
     coveralls (0.8.19)
@@ -15,11 +15,11 @@
       tins (~> 1.6)
     diff-lcs (1.3)
     docile (1.1.5)
     json (2.0.3)
     rake (11.3.0)
-    redis (3.3.3)
+    redis (4.0.1)
     rspec (3.5.0)
       rspec-core (~> 3.5.0)
       rspec-expectations (~> 3.5.0)
       rspec-mocks (~> 3.5.0)
     rspec-core (3.5.4)
@@ -49,6 +49,6 @@
   rake (~> 11.1, >= 11.1.2)
   redlock!
   rspec (~> 3, >= 3.0.0)
 
 BUNDLED WITH
-   1.12.5
+   1.16.0