diff --git a/crates/aiken-project/src/config.rs b/crates/aiken-project/src/config.rs
index ad0bf227..ffc18427 100644
--- a/crates/aiken-project/src/config.rs
+++ b/crates/aiken-project/src/config.rs
@@ -12,6 +12,7 @@ pub use aiken_lang::plutus_version::PlutusVersion;
 pub struct Config {
     pub name: PackageName,
     pub version: String,
+    #[serde(default)]
     pub plutus: PlutusVersion,
     pub license: Option<String>,
     #[serde(default)]
diff --git a/examples/hello_world/aiken.lock b/examples/hello_world/aiken.lock
index 2ea540a4..21fbf8f4 100644
--- a/examples/hello_world/aiken.lock
+++ b/examples/hello_world/aiken.lock
@@ -13,4 +13,4 @@ requirements = []
 source = "github"
 
 [etags]
-"aiken-lang/stdlib@main" = [{ secs_since_epoch = 1714410781, nanos_since_epoch = 118482000 }, "2a710731e0127ec3e21c6c3962a0254c98602e7428b33fc4fcaa67ab368ce1b1"]
+"aiken-lang/stdlib@main" = [{ secs_since_epoch = 1716400776, nanos_since_epoch = 210636000 }, "6b89f2c51314a7bc2cc377d37c9eade9a4239086fe636ac6030c6979182f1247"]