diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 43132ede..4ae5b0a3 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-latest, macos-latest, windows-latest]
+        os: [ubuntu-latest, macos-12, windows-latest]
 
     steps:
       - uses: actions/checkout@v4
diff --git a/ref-tests/tests/ic-ref.rs b/ref-tests/tests/ic-ref.rs
index 4ab86464..a809231f 100644
--- a/ref-tests/tests/ic-ref.rs
+++ b/ref-tests/tests/ic-ref.rs
@@ -843,11 +843,6 @@ mod management_canister {
     #[ignore]
     #[test]
     fn chunked_wasm() {
-        // TODO: remove the following two lines to re-enable the test once dfx release (next of 0.19.0).
-        // The test is disabled because it requires updated replica which is not available in the latest dfx release (0.19.0).
-        // The correctness can be verified by relative tests in the sdk repo.
-        return;
-        #[allow(unreachable_code)]
         with_agent(|agent| async move {
             let wasm = b"\0asm\x01\0\0\0";
             let wasm_hash = Sha256::digest(wasm).to_vec();