diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 258cded761..4467185b39 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -240,17 +240,17 @@ jobs:
       - name: Install Rust
         uses: dtolnay/rust-toolchain@master
         with:
-          toolchain: nightly-2023-05-31  # Compatible version for cargo-check-external-types
+          toolchain: nightly-2023-10-10  # Compatible version for cargo-check-external-types
 
       - 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@0.1.9
 
       - uses: Swatinem/rust-cache@v2
 
       - name: check-external-types
-        run: cargo check-external-types --config .github/workflows/external-types.toml
+        run: cargo check-external-types
 
   udeps:
     needs: [style]
diff --git a/.github/workflows/external-types.toml b/.github/workflows/external-types.toml
deleted file mode 100644
index 23a83c1f02..0000000000
--- a/.github/workflows/external-types.toml
+++ /dev/null
@@ -1,15 +0,0 @@
-allowed_external_types = [
-    "bytes::buf::buf_impl::Buf",
-    "bytes::bytes::Bytes",
-    "http::header",
-    "http::header::map::HeaderMap",
-    "http::method::Method",
-    "http::request::Request",
-    "http::response::Response",
-    "http::status::StatusCode",
-    "http::uri::Uri",
-    "http::version::Version",
-    "http_body::Body",
-    "http_body::frame::Frame",
-    "http_body::size_hint::SizeHint",
-]
diff --git a/Cargo.toml b/Cargo.toml
index 860b2a8dca..201ceda9cd 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -97,6 +97,23 @@ rustdoc-args = ["--cfg", "docsrs", "--cfg", "hyper_unstable_ffi", "--cfg", "hype
 [package.metadata.playground]
 features = ["full"]
 
+[package.metadata.cargo_check_external_types]
+allowed_external_types = [
+    "bytes::buf::buf_impl::Buf",
+    "bytes::bytes::Bytes",
+    "http::header",
+    "http::header::map::HeaderMap",
+    "http::method::Method",
+    "http::request::Request",
+    "http::response::Response",
+    "http::status::StatusCode",
+    "http::uri::Uri",
+    "http::version::Version",
+    "http_body::Body",
+    "http_body::frame::Frame",
+    "http_body::size_hint::SizeHint",
+]
+
 [profile.release]
 codegen-units = 1
 incremental = false