diff --git a/optimizerapi/optimizer.py b/optimizerapi/optimizer.py
index 633778e..17e28fe 100644
--- a/optimizerapi/optimizer.py
+++ b/optimizerapi/optimizer.py
@@ -161,7 +161,7 @@ def __handle_run(body) -> dict:
         result = optimizer.tell(Xi, Yi)
         if n_objectives == 1 and len(result.models) > 0:
             if use_actual_measurement_histogram:
-                optimizer.add_modelled_noise()
+                optimizer.add_observational_noise()
                 result = optimizer.get_result()
             result = [result]
     else:
diff --git a/requirements-freeze.txt b/requirements-freeze.txt
index fa661fd..f6c6c57 100644
--- a/requirements-freeze.txt
+++ b/requirements-freeze.txt
@@ -4,7 +4,7 @@ asgiref==3.6.0
 async-timeout==4.0.2
 attrs==23.1.0
 black==23.3.0
-bokeh==3.1.1
+bokeh==2.4.3
 certifi==2022.12.7
 cffi==1.15.1
 charset-normalizer==3.1.0
@@ -12,10 +12,9 @@ click==8.1.3
 clickclick==20.10.2
 colorama==0.4.6
 connexion==2.14.2
-contourpy==1.1.1
 cryptography==3.4.7
 cycler==0.11.0
-deap==1.4.1
+deap==1.3.3
 deprecation==2.1.0
 docopt==0.6.2
 ecdsa==0.18.0
@@ -29,7 +28,6 @@ httptools==0.5.0
 httpx==0.23.3
 idna==3.4
 importlib-metadata==6.4.1
-importlib-resources==6.1.0
 inflection==0.5.1
 iniconfig==2.0.0
 itsdangerous==2.1.2
@@ -39,17 +37,16 @@ json-tricks==3.15.5
 jsonschema==4.15.0
 kiwisolver==1.4.4
 MarkupSafe==2.1.2
-matplotlib==3.7.2
+matplotlib==3.5.3
 mccabe==0.7.0
 mypy-extensions==1.0.0
-numpy==1.24.4
+numpy==1.23.3
 packaging==23.1
-pandas==2.1.1
 pathspec==0.11.1
 Pillow==9.5.0
 platformdirs==3.5.0
 pluggy==0.13.1
-ProcessOptimizer[browniebee]==0.9.3
+ProcessOptimizer==0.9.5
 py==1.11.0
 py-swagger-ui==1.1.0
 pyasn1==0.4.8
@@ -65,16 +62,15 @@ python-dotenv==1.0.0
 python-jose==3.3.0
 python-keycloak==2.13.2
 python-multipart==0.0.6
-pytz==2023.3.post1
-PyYAML==6.0.1
+PyYAML==6.0
 redis==4.5.4
 requests==2.28.2
 requests-toolbelt==0.10.1
 rfc3986==1.5.0
 rq==1.10.0
 rsa==4.9
-scikit-learn==1.3.0
-scipy==1.10.1
+scikit-learn==1.1.2
+scipy==1.9.1
 six==1.16.0
 sniffio==1.3.0
 starlette==0.25.0
@@ -82,9 +78,8 @@ swagger-ui-bundle==0.0.9
 threadpoolctl==3.1.0
 toml==0.10.2
 tomli==2.0.1
-tornado==6.3.3
+tornado==6.2
 typing_extensions==4.5.0
-tzdata==2023.3
 urllib3==1.26.15
 uvicorn==0.17.6
 uvloop==0.17.0
@@ -93,5 +88,4 @@ watchdog==3.0.0
 watchgod==0.8.2
 websockets==11.0.2
 Werkzeug==2.2.3
-xyzservices==2023.10.0
 zipp==3.15.0
diff --git a/requirements.txt b/requirements.txt
index 866a132..6cfcc5e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,9 +3,18 @@ connexion[swagger-ui]
 python-keycloak==2.13.2
 Flask==2.2.3
 Flask-Cors==3.0.10
-ProcessOptimizer[browniebee]==0.9.3
+ProcessOptimizer==0.9.5
 json-tricks==3.15.5
 jsonschema==4.15.0
 cryptography==3.4.7
 waitress==2.1.2
 rq==1.10.0
+# ProcessOptimizer requirements
+numpy==1.23.3
+matplotlib==3.5.3
+scipy==1.9.1
+bokeh==2.4.3
+scikit-learn==1.1.2
+six==1.16.0
+deap==1.3.3
+pyYAML==6.0