diff --git a/.github/workflows/ci_time_consuming.yml b/.github/workflows/ci_time_consuming.yml
index d1f95e85..33a1c496 100644
--- a/.github/workflows/ci_time_consuming.yml
+++ b/.github/workflows/ci_time_consuming.yml
@@ -15,8 +15,6 @@ jobs:
     steps:
       - uses: actions/checkout@v5
       - uses: dtolnay/rust-toolchain@nightly
-      - name: Install Ziren toolchain
-        run: curl --proto '=https' --tlsv1.2 -sSf https://raw.githubusercontent.com/ProjectZKM/toolchain/refs/heads/main/setup.sh | sh
       - name: Run all unit tests
         run:  |
           source ~/.zkm-toolchain/env