diff --git a/Gemfile.lock b/Gemfile.lock
index 03a9d95..e9a08b6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -8,7 +8,7 @@ GEM
   specs:
     ast (2.4.2)
     diff-lcs (1.4.4)
-    os (1.1.1)
+    os (1.1.4)
     parallel (1.22.1)
     parser (3.1.3.0)
       ast (~> 2.4.1)
@@ -52,6 +52,7 @@ PLATFORMS
   x86_64-darwin-17
   x86_64-darwin-19
   x86_64-darwin-20
+  x86_64-linux
 
 DEPENDENCIES
   bundler