diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index 4767419b..ae2eff53 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -37,12 +37,9 @@ jobs:
   jsontests:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
     - uses: actions/checkout@v4
       with:
-        path: jsontests/res/ethtests
-        repository: ethereum/tests
-        ref: 428f218d7d6f4a52544e12684afbfe6e2882ffbf
+        submodules: recursive
     - name: Run tests
       run: |
         cargo run --release --verbose -p jsontests -- \
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 00000000..c0ada775
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "jsontests/res/ethtests"]
+	path = jsontests/res/ethtests
+	url = https://github.com/ethereum/tests
diff --git a/jsontests/res/ethtests b/jsontests/res/ethtests
new file mode 160000
index 00000000..428f218d
--- /dev/null
+++ b/jsontests/res/ethtests
@@ -0,0 +1 @@
+Subproject commit 428f218d7d6f4a52544e12684afbfe6e2882ffbf