diff --git a/action.yml b/action.yml
index 7bc7fef..f7ca295 100644
--- a/action.yml
+++ b/action.yml
@@ -23,7 +23,7 @@ inputs:
   version:
     description: 'Tailscale version to use.'
     required: true
-    default: '1.42.0'
+    default: '1.66.1'
   sha256sum:
     description: 'Expected SHA256 checksum of the tarball.'
     required: false