diff --git a/pose_anonymization/evaluate_example_stitching.py b/pose_anonymization/evaluate_example_stitching.py
index bd92d63..29d8530 100644
--- a/pose_anonymization/evaluate_example_stitching.py
+++ b/pose_anonymization/evaluate_example_stitching.py
@@ -4,7 +4,6 @@
 from pose_format import Pose
 from pose_format.numpy.representation.distance import DistanceRepresentation
 from pose_format.utils.optical_flow import OpticalFlowCalculator
-# pylint: disable=import-error
 from spoken_to_signed.gloss_to_pose.concatenate import concatenate_poses
 
 plt.rcParams["font.family"] = "Times New Roman"
diff --git a/pyproject.toml b/pyproject.toml
index bf6d039..c47e33c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -14,7 +14,9 @@ dependencies = [
 [project.optional-dependencies]
 dev = [
     "pytest",
-    "pylint"
+    "pylint",
+    "matplotlib",
+    "spoken_to_signed @ git+https://github.com/ZurichNLP/spoken-to-signed-translation"
 ]
 
 [tool.yapf]