diff --git a/.github/workflows/tests-workflow.yaml b/.github/workflows/tests-workflow.yaml
index d32db482..6035cd6b 100644
--- a/.github/workflows/tests-workflow.yaml
+++ b/.github/workflows/tests-workflow.yaml
@@ -32,11 +32,11 @@ jobs:
         id: dependencies
         run: |
           source ci/deps/${{ matrix.config }}.sh
-          echo "CONDA_PYTHON_VERSION=${CONDA_PYTHON_VERSION}" >> $GITHUB_ENV
-          echo "PANDAS_VERSION=${PANDAS_VERSION}" >> $GITHUB_ENV
-          echo "NUMPY_VERSION=${NUMPY_VERSION}" >> $GITHUB_ENV
-          echo "SKLEARN_VERSION=${SKLEARN_VERSION}" >> $GITHUB_ENV
-          echo "NO_SLOW=${NO_SLOW}" >> $GITHUB_ENV
+          echo "CI_PYTHON_VERSION=${CI_PYTHON_VERSION}" >> $GITHUB_ENV
+          echo "CI_PANDAS_VERSION=${CI_PANDAS_VERSION}" >> $GITHUB_ENV
+          echo "CI_NUMPY_VERSION=${CI_NUMPY_VERSION}" >> $GITHUB_ENV
+          echo "CI_SKLEARN_VERSION=${CI_SKLEARN_VERSION}" >> $GITHUB_ENV
+          echo "CI_NO_SLOW=${CI_NO_SLOW}" >> $GITHUB_ENV
           echo "py_version=$(cut -d'.' -f 1-2 <<< ${CONDA_PYTHON_VERSION})" >> $GITHUB_OUTPUT
           echo "requirements=ci/deps/${{ matrix.config }}.sh" >> $GITHUB_OUTPUT
           echo "conda_pkgs=$(${CONDA}/bin/python -c "from conda.base.context import context; print(context.pkgs_dirs[0])")" >> $GITHUB_OUTPUT
@@ -104,11 +104,11 @@ jobs:
           DEPS_CONFIG: py310_pandas14_numpy121_sklearn12
         run: |
           source ci/deps/${DEPS_CONFIG}.sh
-          echo "CONDA_PYTHON_VERSION=${CONDA_PYTHON_VERSION}" >> $GITHUB_ENV
-          echo "PANDAS_VERSION=${PANDAS_VERSION}" >> $GITHUB_ENV
-          echo "NUMPY_VERSION=${NUMPY_VERSION}" >> $GITHUB_ENV
-          echo "SKLEARN_VERSION=${SKLEARN_VERSION}" >> $GITHUB_ENV
-          echo "NO_SLOW=${NO_SLOW}" >> $GITHUB_ENV
+          echo "CI_PYTHON_VERSION=${CI_PYTHON_VERSION}" >> $GITHUB_ENV
+          echo "CI_PANDAS_VERSION=${CI_PANDAS_VERSION}" >> $GITHUB_ENV
+          echo "CI_NUMPY_VERSION=${CI_NUMPY_VERSION}" >> $GITHUB_ENV
+          echo "CI_SKLEARN_VERSION=${CI_SKLEARN_VERSION}" >> $GITHUB_ENV
+          echo "CI_NO_SLOW=${CI_NO_SLOW}" >> $GITHUB_ENV
           echo "requirements=ci/deps/${DEPS_CONFIG}.sh" >> $GITHUB_OUTPUT
           echo "conda_pkgs=$(${CONDA}/bin/python -c "from conda.base.context import context; print(context.pkgs_dirs[0])")" >> $GITHUB_OUTPUT
       - name: Cache downloaded packages
diff --git a/appveyor.yml b/appveyor.yml
index 51e79667..4e46c972 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -28,13 +28,16 @@ install:
   - ps: conda init powershell
   - ps: conda config --set always_yes yes --set changeps1 no
   - ps: conda config --set auto_update_conda false
+  - ps: conda config --set notify_outdated_conda false
 #  - ps: conda update --yes --quiet conda
   - ps: conda info -a
 
   # Install the build and runtime dependencies of the project.
-  - cmd: conda env create -n sksurv-test --file ci\appveyor\requirements_%CONDA_PY%.yaml
+  - ps: $envScript=".\ci\appveyor\py$($env:CONDA_PY).ps1"
+  - ps: "& $envScript"
+  - ps: python "ci\render-requirements.py" "ci\deps\requirements.yaml.tmpl" > environment.yaml
+  - ps: conda env create -n sksurv-test --file environment.yaml
   - cmd: call %CONDA_INSTALL_LOCN%\Scripts\activate.bat sksurv-test
-  - cmd: python -m pip install build
   - cmd: conda list
   # Initialize the submodules
   - cmd: git submodule update --init --recursive
diff --git a/ci/appveyor/py310.ps1 b/ci/appveyor/py310.ps1
new file mode 100644
index 00000000..b3d87f28
--- /dev/null
+++ b/ci/appveyor/py310.ps1
@@ -0,0 +1,4 @@
+$env:CI_PYTHON_VERSION="3.10.*"
+$env:CI_PANDAS_VERSION="1.4.*"
+$env:CI_NUMPY_VERSION="1.21.*"
+$env:CI_SKLEARN_VERSION="1.2.*"
diff --git a/ci/appveyor/py311.ps1 b/ci/appveyor/py311.ps1
new file mode 100644
index 00000000..b8e36bf5
--- /dev/null
+++ b/ci/appveyor/py311.ps1
@@ -0,0 +1,4 @@
+$env:CI_PYTHON_VERSION="3.11.*"
+$env:CI_PANDAS_VERSION="1.5.*"
+$env:CI_NUMPY_VERSION="1.23.*"
+$env:CI_SKLEARN_VERSION="1.2.*"
diff --git a/ci/appveyor/py38.ps1 b/ci/appveyor/py38.ps1
new file mode 100644
index 00000000..aa14bda5
--- /dev/null
+++ b/ci/appveyor/py38.ps1
@@ -0,0 +1,4 @@
+$env:CI_PYTHON_VERSION="3.8.*"
+$env:CI_PANDAS_VERSION="1.1.*"
+$env:CI_NUMPY_VERSION="1.19.*"
+$env:CI_SKLEARN_VERSION="1.2.*"
diff --git a/ci/appveyor/py39.ps1 b/ci/appveyor/py39.ps1
new file mode 100644
index 00000000..9b9f256e
--- /dev/null
+++ b/ci/appveyor/py39.ps1
@@ -0,0 +1,4 @@
+$env:CI_PYTHON_VERSION="3.9.*"
+$env:CI_PANDAS_VERSION="1.3.*"
+$env:CI_NUMPY_VERSION="1.21.*"
+$env:CI_SKLEARN_VERSION="1.2.*"
diff --git a/ci/appveyor/requirements_310.yaml b/ci/appveyor/requirements_310.yaml
deleted file mode 100644
index d1290af5..00000000
--- a/ci/appveyor/requirements_310.yaml
+++ /dev/null
@@ -1,16 +0,0 @@
-name: sksurv-test
-channels:
-  - defaults
-  - sebp
-dependencies:
-  - python=3.10
-  - coverage
-  - cython>=0.29
-  - ecos
-  - numexpr
-  - numpy=1.21
-  - osqp!=0.6.0,!=0.6.1
-  - pytest
-  - scipy!=1.3.0
-  - scikit-learn=1.2
-  - pandas=1.4
diff --git a/ci/appveyor/requirements_311.yaml b/ci/appveyor/requirements_311.yaml
deleted file mode 100644
index dbffddbf..00000000
--- a/ci/appveyor/requirements_311.yaml
+++ /dev/null
@@ -1,16 +0,0 @@
-name: sksurv-test
-channels:
-  - defaults
-  - sebp
-dependencies:
-  - python=3.11
-  - coverage
-  - cython>=0.29
-  - ecos
-  - numexpr
-  - numpy=1.23
-  - osqp!=0.6.0,!=0.6.1
-  - pytest
-  - scipy!=1.3.0
-  - scikit-learn=1.2
-  - pandas=1.5
diff --git a/ci/appveyor/requirements_38.yaml b/ci/appveyor/requirements_38.yaml
deleted file mode 100644
index d8c8cd5a..00000000
--- a/ci/appveyor/requirements_38.yaml
+++ /dev/null
@@ -1,16 +0,0 @@
-name: sksurv-test
-channels:
-  - defaults
-  - sebp
-dependencies:
-  - python=3.8
-  - coverage
-  - cython>=0.29
-  - ecos
-  - numexpr
-  - numpy=1.19
-  - osqp!=0.6.0,!=0.6.1
-  - pytest
-  - scipy!=1.3.0
-  - scikit-learn=1.2
-  - pandas=1.1
diff --git a/ci/appveyor/requirements_39.yaml b/ci/appveyor/requirements_39.yaml
deleted file mode 100644
index e48765c8..00000000
--- a/ci/appveyor/requirements_39.yaml
+++ /dev/null
@@ -1,16 +0,0 @@
-name: sksurv-test
-channels:
-  - defaults
-  - sebp
-dependencies:
-  - python=3.9
-  - coverage
-  - cython>=0.29
-  - ecos
-  - numexpr
-  - numpy=1.21
-  - osqp!=0.6.0,!=0.6.1
-  - pytest
-  - scipy!=1.3.0
-  - scikit-learn=1.2
-  - pandas=1.3
diff --git a/ci/deps/py310_pandas14_numpy121_sklearn12.sh b/ci/deps/py310_pandas14_numpy121_sklearn12.sh
index b72aa690..8ca2259a 100644
--- a/ci/deps/py310_pandas14_numpy121_sklearn12.sh
+++ b/ci/deps/py310_pandas14_numpy121_sklearn12.sh
@@ -1,6 +1,6 @@
 # shellcheck shell=sh
-export CONDA_PYTHON_VERSION='3.10.*'
-export PANDAS_VERSION='1.4.*'
-export NUMPY_VERSION='1.21.*'
-export SKLEARN_VERSION='1.2.*'
-export NO_SLOW=true
+export CI_PYTHON_VERSION='3.10.*'
+export CI_PANDAS_VERSION='1.4.*'
+export CI_NUMPY_VERSION='1.21.*'
+export CI_SKLEARN_VERSION='1.2.*'
+export CI_NO_SLOW=true
diff --git a/ci/deps/py311_pandas15_numpy123_sklearn12.sh b/ci/deps/py311_pandas15_numpy123_sklearn12.sh
index fd8d74fb..0c6c0111 100644
--- a/ci/deps/py311_pandas15_numpy123_sklearn12.sh
+++ b/ci/deps/py311_pandas15_numpy123_sklearn12.sh
@@ -1,6 +1,6 @@
 # shellcheck shell=sh
-export CONDA_PYTHON_VERSION='3.11.*'
-export PANDAS_VERSION='1.5.*    '
-export NUMPY_VERSION='1.23.*'
-export SKLEARN_VERSION='1.2.*'
-export NO_SLOW=false
+export CI_PYTHON_VERSION='3.11.*'
+export CI_PANDAS_VERSION='1.5.*    '
+export CI_NUMPY_VERSION='1.23.*'
+export CI_SKLEARN_VERSION='1.2.*'
+export CI_NO_SLOW=false
diff --git a/ci/deps/py38_pandas10_numpy119_sklearn12.sh b/ci/deps/py38_pandas10_numpy119_sklearn12.sh
index 184aaa1e..0a2d07e2 100644
--- a/ci/deps/py38_pandas10_numpy119_sklearn12.sh
+++ b/ci/deps/py38_pandas10_numpy119_sklearn12.sh
@@ -1,6 +1,6 @@
 # shellcheck shell=sh
-export CONDA_PYTHON_VERSION='3.8.*'
-export PANDAS_VERSION='1.0.*'
-export NUMPY_VERSION='1.19.*'
-export SKLEARN_VERSION='1.2.*'
-export NO_SLOW=false
+export CI_PYTHON_VERSION='3.8.*'
+export CI_PANDAS_VERSION='1.0.*'
+export CI_NUMPY_VERSION='1.19.*'
+export CI_SKLEARN_VERSION='1.2.*'
+export CI_NO_SLOW=false
diff --git a/ci/deps/py39_pandas13_numpy121_sklearn12.sh b/ci/deps/py39_pandas13_numpy121_sklearn12.sh
index 44a94cc1..b0c6e1b1 100644
--- a/ci/deps/py39_pandas13_numpy121_sklearn12.sh
+++ b/ci/deps/py39_pandas13_numpy121_sklearn12.sh
@@ -1,6 +1,6 @@
 # shellcheck shell=sh
-export CONDA_PYTHON_VERSION='3.9.*'
-export PANDAS_VERSION='1.3.*'
-export NUMPY_VERSION='1.21.*'
-export SKLEARN_VERSION='1.2.*'
-export NO_SLOW=true
+export CI_PYTHON_VERSION='3.9.*'
+export CI_PANDAS_VERSION='1.3.*'
+export CI_NUMPY_VERSION='1.21.*'
+export CI_SKLEARN_VERSION='1.2.*'
+export CI_NO_SLOW=true
diff --git a/ci/deps/requirements.yaml.tmpl b/ci/deps/requirements.yaml.tmpl
index 6430303f..e14e4b24 100644
--- a/ci/deps/requirements.yaml.tmpl
+++ b/ci/deps/requirements.yaml.tmpl
@@ -12,14 +12,14 @@ dependencies:
   - matplotlib>=3.5.1,<3.6
   - nbformat
   - numexpr
-  - numpy={NUMPY_VERSION}
+  - numpy={CI_NUMPY_VERSION}
   - osqp!=0.6.0,!=0.6.1
   - packaging
-  - pandas={PANDAS_VERSION}
+  - pandas={CI_PANDAS_VERSION}
   - pip
   - pytest
-  - python={PYTHON_VERSION}
-  - scikit-learn={SKLEARN_VERSION}
+  - python={CI_PYTHON_VERSION}
+  - scikit-learn={CI_SKLEARN_VERSION}
   - scipy>=1.3.2
   - seaborn>=0.11.2,<0.12
   - setuptools-scm
diff --git a/ci/render-requirements.py b/ci/render-requirements.py
index 8e6ca919..09a11497 100644
--- a/ci/render-requirements.py
+++ b/ci/render-requirements.py
@@ -14,7 +14,7 @@ def get_pinned_packages():
     }
     pinned = {}
     for env_name in pkgs:
-        key = f"{env_name}_VERSION"
+        key = f"CI_{env_name}_VERSION"
         ver = os.environ.get(key, "*")
         pinned[key] = ver
     return pinned
diff --git a/ci/run_tests.sh b/ci/run_tests.sh
index 92816347..04bafeb6 100755
--- a/ci/run_tests.sh
+++ b/ci/run_tests.sh
@@ -4,7 +4,7 @@ export PYTHONWARNINGS="default"
 
 pytest_opts=("")
 
-if [ "x${NO_SLOW:-false}" != "xtrue" ]; then
+if [ "x${CI_NO_SLOW:-false}" != "xtrue" ]; then
   coverage erase
   rm -f coverage.xml
 else
diff --git a/ci/setup_env.sh b/ci/setup_env.sh
index 7a96584c..c80fa11f 100755
--- a/ci/setup_env.sh
+++ b/ci/setup_env.sh
@@ -21,9 +21,9 @@ python ci/render-requirements.py ci/deps/requirements.yaml.tmpl > environment.ya
 
 conda env create -n sksurv-test --solver=libmamba --file environment.yaml
 
-echo "numpy ${NUMPY_VERSION:?}" > "${CONDA:?}/envs/sksurv-test/conda-meta/pinned"
-echo "pandas ${PANDAS_VERSION:?}" >> "${CONDA:?}/envs/sksurv-test/conda-meta/pinned"
-echo "scikit-learn ${SKLEARN_VERSION:?}" >> "${CONDA:?}/envs/sksurv-test/conda-meta/pinned"
+echo "numpy ${CI_NUMPY_VERSION:?}" > "${CONDA:?}/envs/sksurv-test/conda-meta/pinned"
+echo "pandas ${CI_PANDAS_VERSION:?}" >> "${CONDA:?}/envs/sksurv-test/conda-meta/pinned"
+echo "scikit-learn ${CI_SKLEARN_VERSION:?}" >> "${CONDA:?}/envs/sksurv-test/conda-meta/pinned"
 
 # Useful for debugging any issues with conda
 conda info -a