diff --git a/scripts/nightly.yaml b/scripts/nightly.yaml
index 74768fbea..0cf37a11d 100644
--- a/scripts/nightly.yaml
+++ b/scripts/nightly.yaml
@@ -43,7 +43,7 @@ stages:
     pool:
       vmImage: "macOS-latest"
     steps:
-    - script: python scripts/mk_unix_dist.py --dotnet-key=$(Build.SourcesDirectory)/resources/z3.snk --arch=arm64 --os=osx-11.0
+    - script: python scripts/mk_unix_dist.py --dotnet-key=$(Build.SourcesDirectory)/resources/z3.snk --arch=arm64
     - script: git clone https://github.com/z3prover/z3test z3test
     - script: cp dist/*.zip $(Build.ArtifactStagingDirectory)/.
     - task: PublishPipelineArtifact@1
diff --git a/scripts/release.yml b/scripts/release.yml
index 308fcfff4..3b25ca084 100644
--- a/scripts/release.yml
+++ b/scripts/release.yml
@@ -48,7 +48,7 @@ stages:
     pool:
       vmImage: "macOS-latest"
     steps:
-    - script: python scripts/mk_unix_dist.py --dotnet-key=$(Build.SourcesDirectory)/resources/z3.snk --arch=arm64 --os=osx-11.0
+    - script: python scripts/mk_unix_dist.py --dotnet-key=$(Build.SourcesDirectory)/resources/z3.snk --arch=arm64
     - script: git clone https://github.com/z3prover/z3test z3test
     - script: cp dist/*.zip $(Build.ArtifactStagingDirectory)/.
     - task: PublishPipelineArtifact@1