diff --git a/.github/workflows/publish-to-pypi.yml b/.github/workflows/publish-to-pypi.yml
index 583c2ed..9805b2b 100644
--- a/.github/workflows/publish-to-pypi.yml
+++ b/.github/workflows/publish-to-pypi.yml
@@ -32,7 +32,7 @@ jobs:
         python -m pip install --upgrade pip
         pip install .
     - name: Create lock requirements file
-      run: pip freeze | grep -v "benchmarking-asv" > requirements.txt
+      run: pip list --format=freeze --exclude "benchmarking-asv" > requirements.txt
     - name: Install dev dependencies
       run: pip install .[dev]
     - name: Run unit tests with pytest
diff --git a/MANIFEST.in b/MANIFEST.in
new file mode 100644
index 0000000..540b720
--- /dev/null
+++ b/MANIFEST.in
@@ -0,0 +1 @@
+include requirements.txt
\ No newline at end of file