bump kgio dependency to ~> 2.1

The kgio 2.x series will maintain API compatibility
until 3.x, so it's safe to use any 2.x release.

1 files changed, 1 insertions, 1 deletions

diff --git a/script/isolate_for_tests b/script/isolate_for_tests
index 0b62430..8441e06 100755
--- a/script/isolate_for_tests
+++ b/script/isolate_for_tests
@@ -17,7 +17,7 @@ opts = {
 pid = fork do
   Isolate.now!(opts) do
     gem 'sqlite3-ruby', '1.2.5'
-    gem 'kgio', '2.0.0'
+    gem 'kgio', '2.1.1'
     gem 'rack', '1.1.0'
   end
 end