diff --git a/.github/workflows/build_and_test.yml b/.github/workflows/build_and_test.yml
index 2650241089..11c5d11af0 100644
--- a/.github/workflows/build_and_test.yml
+++ b/.github/workflows/build_and_test.yml
@@ -216,7 +216,7 @@ jobs:
       MAIN_LLVM_VERSION: 20
     steps:
       - uses: actions/checkout@v4
-      - uses: dtolnay/rust-toolchain@stable
+      - uses: dtolnay/rust-toolchain@nightly
         with:
           components: rustfmt
       - uses: Swatinem/rust-cache@v2
@@ -498,8 +498,8 @@ jobs:
         fuzzer:
           # Full-system
           - ./fuzzers/full_system/qemu_baremetal
-          - ./fuzzers/full_system/qemu_linux_kernel
-          - ./fuzzers/full_system/qemu_linux_process
+          # - ./fuzzers/full_system/qemu_linux_kernel
+          # - ./fuzzers/full_system/qemu_linux_process
 
     runs-on: [ self-hosted, qemu ]
     container: registry.gitlab.com/qemu-project/qemu/qemu/ubuntu2204:latest