diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 182986af531640adf2392bf9e0a111411178d1ac..008090c7b653b22fa1e3d358ee7a2aac09ae4490 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -69,7 +69,7 @@ full:
     - python -m pip install -U cppimport pybind11
     - python -m pip install --upgrade git+https://github.com/sympy/sympy.git
     - python -m pip install -e .
-    - python -m pip install git+https://i10git.cs.fau.de/seitz/pystencils.git
+    - python -m pip install git+https://i10git.cs.fau.de/seitz/pystencils.git@89ed566a9f08dfeb2faa98a5bd9110acc2edff5a
     - python setup.py test
     - python setup.py doctest
   tags: