diff --git a/requirements.txt b/requirements.txt
index 6af3ee7..caee34c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -10,6 +10,5 @@ opencv-python
 PyQt5
 scipy
 pydantic
-ontolutils
-pivmetalib @ git+https://github.com/matthiasprobst/pivmetalib
-ontolutils @ git+https://github.com/matthiasprobst/ontology-utils
\ No newline at end of file
+ontolutils == 0.6.0
+pivmetalib @ git+https://github.com/matthiasprobst/pivmetalib
\ No newline at end of file
diff --git a/setup.cfg b/setup.cfg
index 28f3243..d3072b5 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -33,7 +33,8 @@ install_requires =
     opencv-python
     scipy
     pydantic
-    ontolutils >= 0.4.8
+    ontolutils == 0.6.0
+    ssnolib @ git+https://github.com/matthiasprobst/SSNOlib@v1.3.0.1a1
     pivmetalib @ git+https://github.com/matthiasprobst/pivmetalib
 
 [options.extras_require]
diff --git a/synpivimage/laser.py b/synpivimage/laser.py
index bd3a282..2801696 100644
--- a/synpivimage/laser.py
+++ b/synpivimage/laser.py
@@ -4,7 +4,8 @@
 
 import matplotlib.pyplot as plt
 import numpy as np
-from ontolutils.namespacelib import PIVMETA, QUDT_UNIT
+from ontolutils.namespacelib import QUDT_UNIT
+from pivmetalib import PIVMETA
 from pydantic import BaseModel
 
 from .codemeta import get_package_meta