diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index b7055b1bab0..96c92090fa9 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -146,16 +146,16 @@ jobs:
       run: ci/dump-environment.sh
     - run: rustup update --no-self-update ${{ matrix.rust }} && rustup default ${{ matrix.rust }}
     - run: rustup target add ${{ matrix.other }}
-    - run: rustup component add rustc-dev llvm-tools-preview rust-docs
-      if: startsWith(matrix.rust, 'nightly')
+    # - run: rustup component add rustc-dev llvm-tools-preview rust-docs
+    #   if: startsWith(matrix.rust, 'nightly')
     - run: sudo apt update -y && sudo apt install lldb gcc-multilib libsecret-1-0 libsecret-1-dev -y
       if: matrix.os == 'ubuntu-latest'
-    - run: rustup component add rustfmt || echo "rustfmt not available"
+    # - run: rustup component add rustfmt || echo "rustfmt not available"
     - name: Configure extra test environment
       run: echo CARGO_CONTAINER_TESTS=1 >> $GITHUB_ENV
       if: matrix.os == 'ubuntu-latest'
 
-    - run: cargo test -p cargo --test testsuite -- two_semver_compatible
+    - run: RUST_TEST_THREADS=2 cargo test -p cargo --test testsuite -- two_semver_compatible
     # - name: Clear intermediate test output
     #   run: ci/clean-test-output.sh