diff --git a/shell.nix b/shell.nix
index 3c6c668..c8000b7 100644
--- a/shell.nix
+++ b/shell.nix
@@ -2,10 +2,9 @@ with import <nixpkgs> { overlays = [ (import <rust-overlay>) ]; };
 mkShell {
   RUSTFLAGS = "";
   buildInputs = [
-    (rust-bin.selectLatestNightlyWith (toolchain:
-      toolchain.default.override {
-        extensions = [ "rust-src" "rustfmt-preview" ];
-      }))
+    (rust-bin.nightly."2022-02-14".default.override {
+      extensions = [ "rust-src" "rustfmt-preview" ];
+    })
     xorg.libxcb
   ];
 }