diff --git a/.github/workflows/test_unit_and_examples.yml b/.github/workflows/test_unit_and_examples.yml
index dd65d64b..6f5bce1b 100644
--- a/.github/workflows/test_unit_and_examples.yml
+++ b/.github/workflows/test_unit_and_examples.yml
@@ -64,17 +64,17 @@ jobs:
 
       - name: Install Python dependencies
         run: |
-          pip install --upgrade pip
+          pip install --upgrade pip uv
           
-          pip install numpy --config-settings=setup-args="-Dallow-noblas=true"
-          pip install pytest meson-python ninja cython spin==0.9
+          uv pip install --system numpy --config-settings=setup-args="-Dallow-noblas=true"
+          uv pip install --system pytest meson-python ninja cython spin==0.9
           
           python3 -m spin install-dependencies -test-dep
 
       - name: Install S4 (macOS - arm)
         if: matrix.os == 'macos-latest'
         run: |
-          pip install wheel setuptools
+          uv pip install --system wheel setuptools
           git clone https://github.com/phoebe-p/S4
           cd S4
           git checkout rename_interpolator
@@ -85,7 +85,7 @@ jobs:
       - name: Install S4 (ubuntu)
         if: matrix.os == 'ubuntu-latest'
         run: |
-          pip install wheel setuptools
+          uv pip install --system wheel setuptools
           git clone https://github.com/phoebe-p/S4
           cd S4
           make S4_pyext
@@ -113,7 +113,7 @@ jobs:
         env:
           CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
         run: |
-          python -m pip install codecov
+          python -m uv pip install --system codecov
           python -m spin codecov 
 
 
@@ -154,17 +154,17 @@ jobs:
 
       - name: Install Python dependecies
         run: |
-          pip install --upgrade pip
+          pip install --upgrade pip uv
           
-          pip install numpy --config-settings=setup-args="-Dallow-noblas=true"
-          pip install pytest meson-python ninja cython spin
+          uv pip install --system numpy --config-settings=setup-args="-Dallow-noblas=true"
+          uv pip install --system pytest meson-python ninja cython spin
           
           python3 -m spin install-dependencies -test-dep
 
       - name: Install S4 (macOS - arm)
         if: matrix.os == 'macos-latest'
         run: |
-          pip install wheel setuptools
+          uv pip install --system wheel setuptools
           git clone https://github.com/phoebe-p/S4
           cd S4
           make S4_pyext --file="Makefile.m1"
@@ -174,7 +174,7 @@ jobs:
       - name: Install S4 (ubuntu)
         if: matrix.os == 'ubuntu-latest'
         run: |
-          pip install wheel setuptools
+          uv pip install --system wheel setuptools
           git clone https://github.com/phoebe-p/S4
           cd S4
           make S4_pyext