diff --git a/.github/actions/setup_xtgeo/action.yml b/.github/actions/setup_xtgeo/action.yml
index 22e67f670..2ed1be6b8 100644
--- a/.github/actions/setup_xtgeo/action.yml
+++ b/.github/actions/setup_xtgeo/action.yml
@@ -17,5 +17,5 @@ runs:
     - name: Build and install xtgeo
       shell: bash
       run: |
-        pip install -U pip
-        pip install ".[dev]"
+        python -m pip install -U pip
+        python -m pip install ".[dev]"
diff --git a/pyproject.toml b/pyproject.toml
index 41fda305a..f4702b4d0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [build-system]
 requires = [
-  "scikit-build-core[pyproject]",
+  "scikit-build-core[pyproject]<0.6.0",
   "swig",
   "numpy==1.19.2; python_version == '3.8'",
   "numpy==1.19.5; python_version == '3.9'",