diff --git a/.circleci/config.yml b/.circleci/config.yml
index fce789feb..eb16ee3de 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -98,4 +98,4 @@ workflows:
             tags:
               only: /.*/
           build: "*musllinux*"
-          image: quay.io/pypa/musllinux_1_2_aarch64
+          image: quay.io/pypa/musllinux_1_2_aarch64:2025.02.02-1
diff --git a/.github/workflows/wheels.yml b/.github/workflows/wheels.yml
index 8ba8bff93..534d9b2c8 100644
--- a/.github/workflows/wheels.yml
+++ b/.github/workflows/wheels.yml
@@ -22,7 +22,7 @@ jobs:
         include:
           - image: manylinux_2_28_x86_64
             build: "*manylinux*"
-          - image: musllinux_1_2_x86_64
+          - image: musllinux_1_2_x86_64:2025.02.02-1
             build: "*musllinux*"
 
     steps:
@@ -53,9 +53,13 @@ jobs:
           # Linux arm64 wheels are built on circleci
           CIBW_ARCHS_LINUX: auto64 # ppc64le s390x
 
+
+      - id: image_name_fix
+        run: |
+          image=${{ matrix.image }}; echo "fixed_image_name=${image/:/_}" >>${GITHUB_OUTPUT}
       - uses: actions/upload-artifact@v4
         with:
-          name: artifact-${{ matrix.image }}
+          name: artifact-${{steps.image_name_fix.outputs.fixed_image_name}}
           path: ./wheelhouse/*.whl
 
   build_sdist:
diff --git a/docs/requirements.txt b/docs/requirements.txt
index fd3033b91..e9d89216c 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -3,4 +3,3 @@ sphinx-rtd-theme==3.0.2
 sphinx-autoapi
 sphinx-autodoc-typehints
 sphinxcontrib-autoprogram
-importlib_resources;python_version<'3.9'
diff --git a/pyproject.toml b/pyproject.toml
index 047d56ca4..8667e8fbe 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -5,7 +5,6 @@ requires = [
     "mypy==1.16.1",  # also update mypy-requirements.txt
     "types-requests",
     "types-psutil",
-    "importlib_resources>=1.4;python_version<'3.9'",
     "ruamel.yaml>=0.16.0,<0.19",
     "schema-salad>=8.9,<9",
     "cwl-utils>=0.32",
@@ -22,8 +21,6 @@ write_to = "cwltool/_version.py"
 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*"
-#      ^ skip building wheels on PyPy (any version)
 build-verbosity = 1
 environment = { CWLTOOL_USE_MYPYC="1", MYPYPATH="$(pwd)/mypy-stubs" }
 
diff --git a/requirements.txt b/requirements.txt
index 8c36ccddb..47fafda8f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,6 @@ schema-salad>=8.9,<9
 prov==1.5.1
 mypy-extensions
 psutil>=5.6.6
-importlib_resources>=1.4;python_version<'3.9'
 coloredlogs
 pydot>=1.4.1
 argcomplete>=1.12.0
diff --git a/test-requirements.txt b/test-requirements.txt
index f9b61511b..7ca4d45be 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -3,7 +3,7 @@ pytest>= 6.2,< 8.5
 pytest-xdist>=3.2.0 # for the worksteal scheduler
 psutil # enhances pytest-xdist to allow "-n logical"
 pytest-httpserver
-pytest-retry;python_version>='3.9'
+pytest-retry
 mock>=2.0.0
 pytest-mock>=1.10.0
 pytest-cov