diff --git a/.github/workflows/codecov.yml b/.github/workflows/codecov.yml
index f8f239c1..66a8baa5 100644
--- a/.github/workflows/codecov.yml
+++ b/.github/workflows/codecov.yml
@@ -38,8 +38,9 @@ jobs:
         run: |
           conda install --file requirements/run.txt
           conda install --file requirements/test.txt
+          conda install --file requirements/build.txt
           python -m pip install -r requirements/pip.txt
-          python -m pip install . --no-deps
+          python -m pip install -e . --no-deps
 
       - name: Validate diffpy.pdffit2
         run: |
diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index 89ff2948..a6f0e236 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -36,7 +36,7 @@ jobs:
           conda install --file requirements/run.txt
           conda install --file requirements/docs.txt
           python -m pip install -r requirements/pip.txt
-          python -m pip install . --no-deps
+          python -m pip install -e . --no-deps
 
       - name: build documents
         run: make -C doc html
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index c005f227..6b42f847 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -35,8 +35,9 @@ jobs:
         run: |
           conda install --file requirements/run.txt
           conda install --file requirements/test.txt
+          conda install --file requirements/build.txt
           python -m pip install -r requirements/pip.txt
-          python -m pip install . --no-deps
+          python -m pip install -e . --no-deps
 
       - name: Validate diffpy.pdffit2
         run: python -m pytest
diff --git a/.github/workflows/matrix.yml b/.github/workflows/matrix.yml
index 3b563db1..a4f39eca 100644
--- a/.github/workflows/matrix.yml
+++ b/.github/workflows/matrix.yml
@@ -40,8 +40,9 @@ jobs:
         run: |
           conda install --file requirements/run.txt
           conda install --file requirements/test.txt
+          conda install --file requirements/build.txt
           python -m pip install -r requirements/pip.txt
-          python -m pip install . --no-deps
+          python -m pip install -e . --no-deps
 
       - name: Validate diffpy.pdffit2
         run: python -m pytest