diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f4037553..03afe967 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -31,7 +31,7 @@ jobs:
           profile: minimal
           override: true
       - name: cargo fetch
-        uses: actions-rs/cargo@v1
+        uses: actions-rs/cargo@v1.0.3
         with:
           command: fetch
       - name: Install LLVM on Windows
@@ -54,7 +54,7 @@ jobs:
             echo "CARGO_INCREMENTAL=${{ env.CARGO_INCREMENTAL }}"
             echo "RUST_BACKTRACE=${{ env.RUST_BACKTRACE }}"
       - name: Run tests
-        uses: actions-rs/cargo@v1
+        uses: actions-rs/cargo@v1.0.3
         with:
           command: test
           args: --verbose --all
@@ -62,7 +62,7 @@ jobs:
       - name: Run zebrad large sync tests
         # Skip the entire step on Ubuntu and Windows, because the test would be skipped anyway due to ZEBRA_SKIP_NETWORK_TESTS
         if: matrix.os == 'macOS-latest'
-        uses: actions-rs/cargo@v1
+        uses: actions-rs/cargo@v1.0.3
         with:
           command: test
           args: --verbose --manifest-path zebrad/Cargo.toml sync_large_checkpoints_ -- --ignored
@@ -87,7 +87,7 @@ jobs:
           profile: minimal
           override: true
       - name: cargo fetch
-        uses: actions-rs/cargo@v1
+        uses: actions-rs/cargo@v1.0.3
         with:
           command: fetch
       - name: Show env vars
@@ -116,7 +116,7 @@ jobs:
           profile: minimal
           override: true
       - name: cargo fetch
-        uses: actions-rs/cargo@v1
+        uses: actions-rs/cargo@v1.0.3
         with:
           command: fetch
       - name: Show env vars
@@ -125,7 +125,7 @@ jobs:
             echo "CARGO_INCREMENTAL=${{ env.CARGO_INCREMENTAL }}"
             echo "RUST_BACKTRACE=${{ env.RUST_BACKTRACE }}"
       - name: Build
-        uses: actions-rs/cargo@v1
+        uses: actions-rs/cargo@v1.0.3
         with:
           command: build
           args: --verbose --release
@@ -178,7 +178,7 @@ jobs:
             echo "ZEBRA_SKIP_NETWORK_TESTS=${{ env.ZEBRA_SKIP_NETWORK_TESTS }}"
             echo "CARGO_INCREMENTAL=${{ env.CARGO_INCREMENTAL }}"
             echo "RUST_BACKTRACE=${{ env.RUST_BACKTRACE }}"
-      - uses: actions-rs/cargo@v1
+      - uses: actions-rs/cargo@v1.0.3
         with:
           command: fmt
           args: --all -- --check