diff --git a/hacking/nix/scope/default.nix b/hacking/nix/scope/default.nix
index ea187e245..84fc14362 100644
--- a/hacking/nix/scope/default.nix
+++ b/hacking/nix/scope/default.nix
@@ -83,7 +83,20 @@ superCallPackage ../rust-utils {} self //
 
   inherit fenix;
 
-  topLevelRustToolchainFile = ../../../rust-toolchain.toml;
+  topLevelRustToolchainFile = rec {
+    path = ../../../rust-toolchain.toml;
+    attrs = builtins.fromTOML (builtins.readFile path);
+  };
+
+  assembleRustToolchain = args:
+    let
+      toolchain = fenix.toolchainOf args;
+      profile = topLevelRustToolchainFile.attrs.toolchain.profile or "default";
+      explicitComponents = topLevelRustToolchainFile.attrs.toolchain.components;
+      allComponents = toolchain.manifest.profiles.${profile} ++ explicitComponents;
+      filteredComponents = lib.filter (component: toolchain ? ${component}) allComponents;
+    in
+      toolchain.withComponents filteredComponents;
 
   defaultRustEnvironment =
     let
@@ -98,11 +111,11 @@ superCallPackage ../rust-utils {} self //
 
   defaultUpstreamRustEnvironment = elaborateRustEnvironment (mkDefaultElaborateRustEnvironmentArgs {
     rustToolchain = fenix.fromToolchainFile {
-      file = topLevelRustToolchainFile;
+      file = topLevelRustToolchainFile.path;
       sha256 = "sha256-L1F7kAfo8YWrKXHflUaVvCELdvnK2XjcL/lwopFQX2c=";
     };
   } // {
-    channel = (builtins.fromTOML (builtins.readFile topLevelRustToolchainFile)).toolchain.channel;
+    channel = topLevelRustToolchainFile.attrs.toolchain.channel;
     compilerRTSource = mkCompilerRTSource {
       version = "19.1-2024-07-30";
       hash = "sha256-fV51iDAbkRmWJj0twTmQKdZdLueMAKSZR6bBtgVPCbk=";
diff --git a/hacking/nix/scope/ferrocene/default.nix b/hacking/nix/scope/ferrocene/default.nix
index 13afab137..cdfb435d4 100644
--- a/hacking/nix/scope/ferrocene/default.nix
+++ b/hacking/nix/scope/ferrocene/default.nix
@@ -12,6 +12,7 @@
 , zlib
 
 , fenix
+, assembleRustToolchain
 , crateUtils
 , elaborateRustEnvironment
 , mkDefaultElaborateRustEnvironmentArgs
@@ -169,38 +170,40 @@ let
   # DO NOT CHECK IN THIS FILE
   hashesFilePath = ./SHA256SUMS;
 
-  # upstreamChannel = "1.79.0";
-  upstreamChannel = "beta";
+  upstreamChannel = "1.83.0-beta.2";
+  upstreamDate = null;
 
-  # versionTag = "24.08.0";
-  versionTag = "6ce9c7ddc";
-  versionName = "pre-rolling-2024-09-11";
+  versionTag = builtins.substring 0 9 versionRev;
+  versionRev = "eecd617bc6f3c693099a1ba900abb93ab9db9196";
+  versionName = "nightly-2024-10-30";
 
   repo = fetchFromGitHub {
     owner = "ferrocene";
     repo = "ferrocene";
-    rev = "6ce9c7ddc767a9b4cddd4ef8a0d4a317bb63159a"; # branch release/1.82
-    hash = "sha256-r1s3ifDA9QF9dCPieChFjJo9cwEY6vi5RMtXWyUiw0g=";
+    rev = versionRev;
+    hash = "sha256-HZBJOESd2O0IGX80YmgjLduO1S8CM7VSQxf85FwJw/8=";
   };
 
   libcManifestDir = "${repo}/ferrocene/library/libc";
 
-  upstreamRustToolchain = fenix.fromToolchainFile {
-    file = crateUtils.toTOMLFile "rust-toolchain.toml" {
-      toolchain = {
-        channel = upstreamChannel;
-        components = [ "rustc-dev" ];
-      };
-    };
-    sha256 = "sha256-4vvAuAhW4cBwR+g1IrI79X7gKL4VsEYKD05XZL0rLc4=";
-  };
+  upstreamRustToolchain = assembleRustToolchain ({
+    channel = upstreamChannel;
+    sha256 = "sha256-qaGpvEOo1j+3K/YLVFdvVoD6+E3J32U2PmIIb6+FBxw=";
+  } // lib.optionalAttrs (upstreamDate != null) {
+    date = upstreamDate;
+  });
 
-  upstreamRustEnvironment = lib.fix (self: elaborateRustEnvironment (mkDefaultElaborateRustEnvironmentArgs {
-    rustToolchain = upstreamRustToolchain;
+  mkRustEnvironment = rustToolchain: lib.fix (self: elaborateRustEnvironment (mkDefaultElaborateRustEnvironmentArgs {
+    inherit rustToolchain;
   } // {
     channel = upstreamChannel;
+    mkCustomTargetPath = mkMkCustomTargetPathForEnvironment {
+      rustEnvironment = upstreamRustEnvironment;
+    };
   }));
 
+  upstreamRustEnvironment = mkRustEnvironment upstreamRustToolchain;
+
   rustToolchain = mkToolchain {
     inherit hashesFilePath;
     arch = hostPlatform.config;
@@ -208,14 +211,7 @@ let
     inherit libcManifestDir;
   };
 
-  rustEnvironment = lib.fix (self: elaborateRustEnvironment (mkDefaultElaborateRustEnvironmentArgs {
-    inherit rustToolchain;
-  } // {
-    channel = upstreamChannel;
-    mkCustomTargetPath = mkMkCustomTargetPathForEnvironment {
-      rustEnvironment = upstreamRustEnvironment;
-    };
-  }));
+  rustEnvironment = mkRustEnvironment rustToolchain;
 
 in {
   inherit rustEnvironment;
diff --git a/hacking/nix/scope/verus/default.nix b/hacking/nix/scope/verus/default.nix
index 79bd44f34..5fe844282 100644
--- a/hacking/nix/scope/verus/default.nix
+++ b/hacking/nix/scope/verus/default.nix
@@ -12,7 +12,7 @@
 , crateUtils
 , vendorLockfile
 , sources
-, fenix
+, assembleRustToolchain
 , elaborateRustEnvironment
 , mkDefaultElaborateRustEnvironmentArgs
 , mkMkCustomTargetPathForEnvironment
@@ -23,13 +23,8 @@ let
 
   rustToolchainAttrs = builtins.fromTOML (builtins.readFile (src + "/rust-toolchain.toml"));
 
-  rustToolchain = fenix.fromToolchainFile {
-    file = crateUtils.toTOMLFile "rust-toolchain.toml" (crateUtils.clobber [
-      rustToolchainAttrs
-      {
-        toolchain.components = rustToolchainAttrs.toolchain.components ++ [ "rust-src" ];
-      }
-    ]);
+  rustToolchain = assembleRustToolchain {
+    channel = "1.76.0";
     sha256 = "sha256-e4mlaJehWBymYxJGgnbuCObVlqMlQSilZ8FljG9zPHY=";
   };
 
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index 7a34ba3b9..5069f063a 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -7,3 +7,4 @@
 [toolchain]
 channel = "nightly-2024-10-26"
 components = [ "rust-src", "rustc-dev", "llvm-tools-preview" ]
+profile = "default"