diff --git a/.github/workflows/pr.yml b/.github/workflows/pr.yml
index f503afa15d..41226e139f 100644
--- a/.github/workflows/pr.yml
+++ b/.github/workflows/pr.yml
@@ -54,38 +54,38 @@ jobs:
           FRI_QUERIES: 1
           SP1_DEV: 1
 
-  test-arm:
-    name: Test (ARM)
-    runs-on: runs-on,runner=64cpu-linux-arm64
-    env:
-      CARGO_NET_GIT_FETCH_WITH_CLI: "true"
-    steps:
-      - name: Checkout sources
-        uses: actions/checkout@v2
+  # test-arm:
+  #   name: Test (ARM)
+  #   runs-on: runs-on,runner=64cpu-linux-arm64
+  #   env:
+  #     CARGO_NET_GIT_FETCH_WITH_CLI: "true"
+  #   steps:
+  #     - name: Checkout sources
+  #       uses: actions/checkout@v2
 
-      - name: Setup CI
-        uses: ./.github/actions/setup
+  #     - name: Setup CI
+  #       uses: ./.github/actions/setup
 
-      - name: Run cargo check
-        uses: actions-rs/cargo@v1
-        with:
-          command: check
-          args: --all-targets --all-features
-        env:
-          RUSTFLAGS: -Copt-level=3 -Cdebug-assertions -Coverflow-checks=y -Cdebuginfo=0 -C target-cpu=native -C target_feature=+avx512ifma,+avx512vl
-          RUST_LOG: info
-          RUST_BACKTRACE: 1
+  #     - name: Run cargo check
+  #       uses: actions-rs/cargo@v1
+  #       with:
+  #         command: check
+  #         args: --all-targets --all-features
+  #       env:
+  #         RUSTFLAGS: -Copt-level=3 -Cdebug-assertions -Coverflow-checks=y -Cdebuginfo=0 -C target-cpu=native
+  #         RUST_LOG: info
+  #         RUST_BACKTRACE: 1
 
-      - name: Run cargo test
-        uses: actions-rs/cargo@v1
-        with:
-          command: test
-          args: --release
-        env:
-          RUSTFLAGS: -Copt-level=3 -Cdebug-assertions -Coverflow-checks=y -Cdebuginfo=0 -C target-cpu=native -C target_feature=+avx512ifma,+avx512vl
-          RUST_BACKTRACE: 1
-          FRI_QUERIES: 1
-          SP1_DEV: 1
+  #     - name: Run cargo test
+  #       uses: actions-rs/cargo@v1
+  #       with:
+  #         command: test
+  #         args: --release
+  #       env:
+  #         RUSTFLAGS: -Copt-level=3 -Cdebug-assertions -Coverflow-checks=y -Cdebuginfo=0 -C target-cpu=native
+  #         RUST_BACKTRACE: 1
+  #         FRI_QUERIES: 1
+  #         SP1_DEV: 1
 
   lint:
     name: Formatting & Clippy
diff --git a/core/src/stark/machine.rs b/core/src/stark/machine.rs
index 7646ae5641..9e57f102a3 100644
--- a/core/src/stark/machine.rs
+++ b/core/src/stark/machine.rs
@@ -662,7 +662,6 @@ pub mod tests {
     }
 
     #[test]
-    #[serial]
     fn test_fibonacci_prove() {
         setup_logger();
         let program = fibonacci_program();
@@ -670,18 +669,11 @@ pub mod tests {
     }
 
     #[test]
-    #[serial]
     fn test_fibonacci_prove_batch() {
-        std::env::set_var("SHARD_BATCH_SIZE", "1");
-        std::env::set_var("SHARD_SIZE", "16384");
-
         setup_logger();
         let program = fibonacci_program();
         let stdin = SP1Stdin::new();
         run_and_prove(program, &stdin, BabyBearPoseidon2::new());
-
-        std::env::remove_var("SHARD_BATCH_SIZE");
-        std::env::remove_var("SHARD_SIZE");
     }
 
     #[test]