diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index 1079a064..e9c8792b 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -27,7 +27,7 @@ jobs:
           sharedKey: ${{ matrix.os }}
       - name: Cache dependencies
         if: ${{ matrix.os == 'ubuntu-latest' }}
-        run: if [[ ! -e ~/.cargo/bin/grcov ]]; then cargo install grcov; fi
+        run: if [[ ! -e ~/.cargo/bin/grcov ]]; then cargo install --locked grcov; fi
       - name: Format
         run: |
           make format
diff --git a/Cargo.toml b/Cargo.toml
index aeb699d6..c0d2ba2a 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -69,7 +69,7 @@ raft = { git = "https://github.com/tikv/raft-rs", branch = "master", default-fea
 rand = "0.8"
 rand_distr = "0.4"
 tempfile = "3.1"
-toml = "0.7"
+toml = "0.8"
 
 [features]
 internals = []