diff --git a/nixpacks.toml b/nixpacks.toml
index ceacc20..bbdabe3 100644
--- a/nixpacks.toml
+++ b/nixpacks.toml
@@ -1,5 +1,2 @@
-[variables]
-NIXPACKS_JDK_VERSION = "21"
-
 [phases.setup]
-nixPkgs = ["maven"]
+nixPkgs = ["jdk21", "maven"]