diff --git a/pyproject.toml b/pyproject.toml
index dd45d3b..b22690b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -18,6 +18,7 @@ pyts = "^0.11.0"
 nilspodlib = "^3.2.2"
 fau-colors = "^1.0.1"
 signialib = "^2.8.0"
+matplotlib = "^3.5.2, <3.9.0"
 pandas = ">=1.5.2"
 tensorflow = "^2.10.0"
 numba =  [
diff --git a/tests/conftest.py b/tests/conftest.py
index 85e1f13..460628f 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -9,8 +9,6 @@
 from scipy.spatial.transform import Rotation
 from tpcp import BaseTpcpObject
 
-from tests._regression_utils import PyTestSnapshotTest
-
 try:
     from pomegranate import GeneralMixtureModel, State
 except ImportError:
@@ -21,4 +19,4 @@
 @pytest.fixture(autouse=True)
 def reset_random_seed() -> None:
     np.random.seed(10)
-    random.seed(10)
\ No newline at end of file
+    random.seed(10)