diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index ca39767..97b24c1 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -41,7 +41,7 @@ jobs:
 
       - name: Upgrade pip
         run: |
-          pip install --constraint=.github/workflows/constraints.txt pip
+          pip install --constraint=$GITHUB_WORKSPACE/.github/workflows/constraints.txt pip
           pip --version
 
       - name: Upgrade pip in virtual environments
@@ -55,13 +55,13 @@ jobs:
 
       - name: Install Poetry
         run: |
-          pipx install --pip-args=--constraint=.github/workflows/constraints.txt poetry
+          pipx install --pip-args=--constraint=$GITHUB_WORKSPACE/.github/workflows/constraints.txt poetry
           poetry --version
 
       - name: Install Nox
         run: |
-          pipx install --pip-args=--constraint=.github/workflows/constraints.txt nox
-          pipx inject --pip-args=--constraint=.github/workflows/constraints.txt nox nox-poetry
+          pipx install --pip-args=--constraint=$GITHUB_WORKSPACE/.github/workflows/constraints.txt nox
+          pipx inject --pip-args=--constraint=$GITHUB_WORKSPACE/.github/workflows/constraints.txt nox nox-poetry
           nox --version
 
       - name: Install GDAL
@@ -126,18 +126,18 @@ jobs:
 
       - name: Upgrade pip
         run: |
-          pip install --constraint=.github/workflows/constraints.txt pip
+          pip install --constraint=$GITHUB_WORKSPACE/.github/workflows/constraints.txt pip
           pip --version
 
       - name: Install Poetry
         run: |
-          pipx install --pip-args=--constraint=.github/workflows/constraints.txt poetry
+          pipx install --pip-args=--constraint=$GITHUB_WORKSPACE/.github/workflows/constraints.txt poetry
           poetry --version
 
       - name: Install Nox
         run: |
-          pipx install --pip-args=--constraint=.github/workflows/constraints.txt nox
-          pipx inject --pip-args=--constraint=.github/workflows/constraints.txt nox nox-poetry
+          pipx install --pip-args=--constraint=$GITHUB_WORKSPACE/.github/workflows/constraints.txt nox
+          pipx inject --pip-args=--constraint=$GITHUB_WORKSPACE/.github/workflows/constraints.txt nox nox-poetry
           nox --version
 
       - name: Download coverage data