diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8fefaed..7fa57a9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -164,7 +164,7 @@ 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-2024-05-01
+          - nightly-2024-06-30
     steps:
       - uses: actions/checkout@v4
       - name: Install Rust ${{ matrix.rust }}
@@ -175,7 +175,7 @@ jobs:
       - name: Install cargo-check-external-types
         uses: taiki-e/cache-cargo-install-action@v2
         with:
-          tool: cargo-check-external-types@0.1.12
+          tool: cargo-check-external-types@0.1.13
       - name: check-external-types
         run: cargo check-external-types --all-features --config external-types.toml
         working-directory: aws-s3-transfer-manager