diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 729272f..0a1462e 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -18,6 +18,10 @@ on:
 permissions:
   contents: read
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   linux:
     runs-on: ubuntu-latest
diff --git a/example/derive_expression/requirements.txt b/example/derive_expression/requirements.txt
index bc93ce3..6471a4a 100644
--- a/example/derive_expression/requirements.txt
+++ b/example/derive_expression/requirements.txt
@@ -1,2 +1,6 @@
 maturin
 polars
+hypothesis
+numpy
+pandas
+pytest