diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index cb95c4f..68c8238 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -10,7 +10,7 @@ jobs:
       fail-fast: false
       matrix:
         cache_nonce: [ 1 ]
-        nim_version: [ 1.6, 2.0 ]
+        nim_version: [ 1.6.20, stable ]
         platform:
           - {
             icon: 🐧,
@@ -140,7 +140,7 @@ jobs:
           if [[ ${{ matrix.platform.os }} = macos ]]; then
             export PATH="$(brew --prefix llvm@14)/bin:${PATH}"
             export LDFLAGS="-L$(brew --prefix libomp)/lib -L$(brew --prefix llvm@14)/lib -Wl,-rpath,$(brew --prefix llvm@14)/lib"
-            compiler_extra_options="-d:LeopardCmakeFlags='-DCMAKE_BUILD_TYPE=Release -DCMAKE_C_COMPILER=$(brew --prefix llvm@14)/bin/clang -DCMAKE_CXX_COMPILER=$(brew --prefix llvm@14)/bin/clang++' -d:LeopardExtraCompilerlags='-fopenmp' -d:LeopardExtraLinkerFlags='-fopenmp -L$(brew --prefix libomp)/lib'"
+            compiler_extra_options="-d:LeopardCmakeFlags='-DENABLE_OPENMP=off -DCMAKE_BUILD_TYPE=Release -DCMAKE_C_COMPILER=$(brew --prefix llvm@14)/bin/clang -DCMAKE_CXX_COMPILER=$(brew --prefix llvm@14)/bin/clang++' -d:LeopardExtraCompilerlags='-fopenmp' -d:LeopardExtraLinkerFlags='-fopenmp -L$(brew --prefix libomp)/lib'"
           fi
           eval nimble --verbose test -d:release --mm:refc ${compiler_extra_options}
           eval nimble --verbose test -d:release --mm:orc ${compiler_extra_options}