diff --git a/.circleci/config.yml b/.circleci/config.yml
index 2127e18be3..436fca57ca 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -16,7 +16,7 @@ jobs:
 
     machine:
       image: ubuntu-2204:current
-    resource_class: arm.medium  # two vCPUs
+    resource_class: arm.large  # 4 vCPUs
 
     environment:
       CIBW_ARCHS: "aarch64"
@@ -88,13 +88,6 @@ workflows:
               only: /.*/
           build: "*manylinux*"
           image: quay.io/pypa/manylinux_2_28_aarch64
-      - arm-wheels:
-          name: arm-wheels-musllinux_1_1
-          filters:
-            tags:
-              only: /.*/
-          build: "*musllinux*"
-          image: quay.io/pypa/musllinux_1_1_aarch64
       - arm-wheels:
           name: arm-wheels-musllinux_1_2
           filters:
diff --git a/.github/workflows/wheels.yml b/.github/workflows/wheels.yml
index 9c14eb4e76..69c46321a9 100644
--- a/.github/workflows/wheels.yml
+++ b/.github/workflows/wheels.yml
@@ -23,8 +23,6 @@ jobs:
         include:
           - image: manylinux_2_28_x86_64
             build: "*manylinux*"
-          - image: musllinux_1_1_x86_64
-            build: "*musllinux*"
           - image: musllinux_1_2_x86_64
             build: "*musllinux*"
 
diff --git a/pyproject.toml b/pyproject.toml
index a69720739b..cec96b76b0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -18,7 +18,7 @@ build-backend = "setuptools.build_meta"
 write_to = "cwltool/_version.py"
 
 [tool.cibuildwheel]
-test-command = "python -m pytest -n 2 --junitxml={project}/test-results/junit_$(python -V | awk '{print $2}')_${AUDITWHEEL_PLAT}.xml -k 'not (test_bioconda or test_env_filtering or test_udocker)' --pyargs cwltool"
+test-command = "python -m pytest --ignore cwltool/schemas -n logical --dist worksteal --junitxml={project}/test-results/junit_$(python -V | awk '{print $2}')_${AUDITWHEEL_PLAT}.xml -k 'not (test_bioconda or test_env_filtering or test_udocker)' --pyargs cwltool"
 test-requires = "-r test-requirements.txt"
 test-extras = "deps"
 skip = "pp*"