diff --git a/Tests/Data/requirements.txt b/Tests/Data/requirements.txt
index e5c4eaf49cae2c59df0cd7fe6ed9705f1fc9dfb4..136079915d77bcf84f8bd15434fc0ea5cf42c412 100644
--- a/Tests/Data/requirements.txt
+++ b/Tests/Data/requirements.txt
@@ -1,5 +1,6 @@
 --extra-index-url https://gitlab.kitware.com/api/v4/projects/13/packages/pypi/simple
 git+https://gitlab.opengeosys.org/ogs/tools/ogstools@b4f3780274c464260ff43a248fac7379e49c8975#egg=ogstools
+git+https://github.com/bilke/ogs6py@66410a2acc6db77f33c78949e0601670895b0af6#egg=ogs6py
 gmsh>=4.11
 h5py>=3.8
 git+https://github.com/joergbuchwald/heatsource_thm@bbd5bab17fc2ec228c773e087dc847e1ad5f9a4c#egg=heatsource-py