diff --git a/Library/Homebrew/os/mac/xcode.rb b/Library/Homebrew/os/mac/xcode.rb
index 213a9f8319..75f087c1f2 100644
--- a/Library/Homebrew/os/mac/xcode.rb
+++ b/Library/Homebrew/os/mac/xcode.rb
@@ -18,7 +18,7 @@ module OS
         when "10.10" then "7.2.1"
         when "10.11" then "8.2.1"
         when "10.12" then "9.2"
-        when "10.13" then "9.4"
+        when "10.13" then "10.0"
         when "10.14" then "10.0"
         else
           raise "macOS '#{MacOS.version}' is invalid" unless OS::Mac.prerelease?
@@ -273,7 +273,7 @@ module OS
         # CLT package for 10.11 that contains the Clang version from Xcode 8.
         case MacOS.version
         when "10.14" then "1000.11.45.2"
-        when "10.13" then "902.0.39.2"
+        when "10.13" then "1000.11.45.2"
         when "10.12" then "900.0.39.2"
         when "10.11" then "800.0.42.1"
         when "10.10" then "700.1.81"