diff --git a/Cargo.toml b/Cargo.toml
index 40752b2..9098919 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,5 +1,7 @@
 [workspace]
 members = ["crates/*"]
+resolver = "2"
+
 [profile.dev]
 split-debuginfo = "unpacked"
 
diff --git a/crates/simplexpr/src/lib.rs b/crates/simplexpr/src/lib.rs
index 8a40287..f2cdc87 100644
--- a/crates/simplexpr/src/lib.rs
+++ b/crates/simplexpr/src/lib.rs
@@ -3,7 +3,6 @@
 #![feature(try_blocks)]
 #![feature(unwrap_infallible)]
 #![feature(never_type)]
-#![feature(once_cell)]
 
 pub mod ast;
 pub mod dynval;