diff --git a/.github/workflows/pipeline.yml b/.github/workflows/pipeline.yml
index 1dad4f1..f6fa88a 100644
--- a/.github/workflows/pipeline.yml
+++ b/.github/workflows/pipeline.yml
@@ -21,7 +21,6 @@ jobs:
     - name: Test
       shell: bash -l {0}
       run: |
-        pip install python-workflow-definition
         verdi presto --profile-name pwd
         cp .ci_support/test_with_aiida.py .
         python test_with_aiida.py
@@ -41,7 +40,6 @@ jobs:
     - name: Test
       shell: bash -l {0}
       run: |
-        pip install python-workflow-definition
         cp .ci_support/test_with_jobflow.py .
         python test_with_jobflow.py
 
@@ -60,6 +58,5 @@ jobs:
     - name: Test
       shell: bash -l {0}
       run: |
-        pip install python-workflow-definition
         cp .ci_support/test_with_pyiron.py .
         python test_with_pyiron.py
diff --git a/environment.yml b/environment.yml
index d829e9c..60e3675 100644
--- a/environment.yml
+++ b/environment.yml
@@ -2,3 +2,5 @@ channels:
 - conda-forge
 dependencies:
 - python =3.12
+- pip:
+  - python-workflow-definition==0.0.1