diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 059ebdd..9338807 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -48,7 +48,7 @@ jobs:
       SNAPSHOT_TESTS: "1"
     steps:
       - uses: actions/checkout@v4
-      - uses: dtolnay/rust-toolchain@1.95.0
+      - uses: dtolnay/rust-toolchain@1.100.0
       - uses: taiki-e/install-action@v2
         with:
           tool: cargo-expand
@@ -60,7 +60,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: dtolnay/rust-toolchain@1.71.0
+      - uses: dtolnay/rust-toolchain@1.100.0
       - uses: Swatinem/rust-cache@v2
       # check, not test: dev-deps need not honor MSRV
       - run: cargo check --workspace --locked