diff --git a/Library/Homebrew/Gemfile.lock b/Library/Homebrew/Gemfile.lock
index bf55ce0f02..62ce9132fc 100644
--- a/Library/Homebrew/Gemfile.lock
+++ b/Library/Homebrew/Gemfile.lock
@@ -11,7 +11,7 @@ GEM
     coderay (1.1.3)
     commander (4.6.0)
       highline (~> 2.0.0)
-    diff-lcs (1.5.0)
+    diff-lcs (1.5.1)
     docile (1.4.0)
     elftools (1.2.0)
       bindata (~> 2)
@@ -163,8 +163,6 @@ GEM
       yard (>= 0.9)
 
 PLATFORMS
-  aarch64-linux
-  arm-linux
   arm64-darwin
   x86_64-darwin
   x86_64-linux