diff --git a/.github/workflows/pytest.yml b/.github/workflows/pytest.yml
index 1023ac6..1fb7dcd 100644
--- a/.github/workflows/pytest.yml
+++ b/.github/workflows/pytest.yml
@@ -46,8 +46,9 @@ jobs:
           sudo apt-get install -y graphviz
           python -m pip install --upgrade pip
           python -m pip install pytest coverage coveralls
-          pip install git+https://github.com/AxFoundation/strax.git
-          pip install git+https://github.com/XENONnT/straxen.git
+          pip install git+https://github.com/XENONnT/base_environment@el7.sr1_cevns_unblind --force-reinstall
+          pip install strax==v1.6.5 --force-reinstall
+          pip install git+https://github.com/XENONnT/straxen.git@sr1_leftovers --force-reinstall
 
       - name: Start MongoDB
         uses: supercharge/mongodb-github-action@1.10.0
diff --git a/pyproject.toml b/pyproject.toml
index 066fa5c..6394fc6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -22,8 +22,8 @@ documentation = "https://readthedocs.org/projects/axidence/"
 
 [tool.poetry.dependencies]
 python = ">=3.9,<4.0"
-strax = ">=1.6.3"
-straxen = ">=2.2.1"
+strax = ">=1.6.3,<=1.6.5"
+straxen = ">=2.2.1,<=2.3.0"
 GOFevaluation = ">=0.1.4"
 
 [build-system]