diff --git a/.cargo/config.toml b/.cargo/config.toml
new file mode 100644
index 0000000..529b14d
--- /dev/null
+++ b/.cargo/config.toml
@@ -0,0 +1,8 @@
+[unstable]
+registry-auth = true
+
+[registries.menteeth]
+index = "ssh://git@git.shipyard.rs/menteeth/crate-index.git"
+
+[net]
+git-fetch-with-cli = true
diff --git a/flake.nix b/flake.nix
index 3129a67..888531f 100644
--- a/flake.nix
+++ b/flake.nix
@@ -37,16 +37,17 @@
           src = if inShell then null else ./.;
 
           buildInputs =
-            [ rustc
-              cargo
-              openssl
+            [ openssl
               pkg-config
             ] ++ (if inShell then [
               # In 'nix develop', provide some developer tools.
               rust-analyzer
               rustfmt
+              rustup
               clippy
             ] else [
+              rustc
+              cargo
               (import-cargo.builders.importCargo {
                 lockFile = ./Cargo.lock;
                 inherit pkgs;
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
new file mode 100644
index 0000000..9706c9a
--- /dev/null
+++ b/rust-toolchain.toml
@@ -0,0 +1,2 @@
+[toolchain]
+channel = "nightly-2023-04-30"