diff --git a/kscript.hcl b/kscript.hcl
index 7eec2286..7ea7aa9d 100644
--- a/kscript.hcl
+++ b/kscript.hcl
@@ -6,7 +6,7 @@ test = "kscript -d 'println(\"Kscript: OK\")'"
 
 // these older versions break with Kotlin 1.9, so just limit them to older versions.
 version "4.1.1" "4.2.0" "4.2.1" "4.2.2" {
-  requires = ["jre", "kotlin-1.8.22"]
+  requires = ["jre@17", "kotlin-1.8.22"]
   test = "kscript \"\"" // The test rig can't install older kotlin to test these, but they've been tested prior.
 }