diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b22f53c8a..a2242d3b8 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -931,7 +931,7 @@ jobs:
         rust:
           # `check-external-types` requires a specific Rust nightly version. See
           # the README for details: https://github.com/awslabs/cargo-check-external-types
-          - nightly-2023-05-31
+          - nightly-2023-10-21
     steps:
       - uses: actions/checkout@v4
       - name: Install Rust ${{ matrix.rust }}
@@ -942,9 +942,9 @@ jobs:
       - name: Install cargo-check-external-types
         uses: taiki-e/cache-cargo-install-action@v1
         with:
-          tool: cargo-check-external-types@0.1.7
+          tool: cargo-check-external-types@0.1.10
       - name: check-external-types
-        run: cargo check-external-types --all-features --config external-types.toml
+        run: cargo check-external-types --all-features
         working-directory: tokio
 
   check-fuzzing:
diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml
index 87d2a460c..2efbca02d 100644
--- a/tokio/Cargo.toml
+++ b/tokio/Cargo.toml
@@ -164,3 +164,13 @@ rustc-args = ["--cfg", "tokio_unstable", "--cfg", "tokio_taskdump"]
 
 [package.metadata.playground]
 features = ["full", "test-util"]
+
+[package.metadata.cargo_check_external_types]
+# The following are types that are allowed to be exposed in Tokio's public API.
+# The standard library is allowed by default.
+allowed_external_types = [
+   "bytes::buf::buf_impl::Buf",
+   "bytes::buf::buf_mut::BufMut",
+
+   "tokio_macros::*",
+]
diff --git a/tokio/external-types.toml b/tokio/external-types.toml
deleted file mode 100644
index a5bde8ed1..000000000
--- a/tokio/external-types.toml
+++ /dev/null
@@ -1,11 +0,0 @@
-# This config file is for the `cargo-check-external-types` tool that is run in CI.
-
-# The following are types that are allowed to be exposed in Tokio's public API.
-# The standard library is allowed by default.
-allowed_external_types = [
-   "bytes::buf::buf_impl::Buf",
-   "bytes::buf::buf_mut::BufMut",
-
-   "tokio_macros::*",
-]
-