diff --git a/Dockerfile b/Dockerfile
index e44669f1..d2506444 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,10 +1,10 @@
-FROM debian:9
+FROM debian:12
 
 WORKDIR /root/pycam
 
 COPY . .
 
-RUN apt-get update && apt-get install -y python3 \
+RUN apt-get update && apt-get install -y python3.12 \
     python3-gi \
     python3-opengl \
     python3-yaml \
diff --git a/README.md b/README.md
index 9a95b9fb..44c15daa 100644
--- a/README.md
+++ b/README.md
@@ -43,3 +43,14 @@ See the [documentation](http://pycam.sourceforge.net/introduction/) for a short
 * Nicholas Humfrey: documentation, recovery of old sourceforge-wiki
 * Piers Titus van der Torren: documentation
 * Reuben Rissler: gtk3 migration
+
+## Steps to Run in python3.12
+```
+sudo apt-get install python3-gi python3-opengl gir1.2-gtk-3.0
+sudo apt-get install libgirepository1.0-dev
+sudo apt-get install libcairo2-dev
+sudo apt-get install python3-dev
+sudo apt-get install libcairo2-dev
+python3 -m venv .env
+pip install -r requirements.txt
+```
diff --git a/mySteps.txt b/mySteps.txt
new file mode 100644
index 00000000..2005b310
--- /dev/null
+++ b/mySteps.txt
@@ -0,0 +1,26 @@
+sudo apt install python3.11-venv
+sudo apt-get install python3-gi python3-opengl gir1.2-gtk-3.0
+python3 -m venv .env
+pip install PyOpenGL PyYAML svg.path
+
+###
+add last part to sources.list
+deb http://deb.debian.org/debian/ bookworm main non-free-firmware
+deb-src http://deb.debian.org/debian/ bookworm main non-free-firmware
+deb [trusted=yes] file:/run/live/medium bookworm main non-free-firmware
+deb http://deb.debian.org/debian/ buster main
+
+sudo apt update
+sudo apt-get install python-gtk2
+sudo apt-get install libcairo2-dev
+pip install numpy
+
+### for installing pyobject need to install all 4 of them
+sudo apt-get install libgirepository1.0-dev
+sudo apt-get install libcairo2-dev
+sudo apt-get install python3-dev
+sudo apt-get install libcairo2-dev
+
+pip install pygobject
+
+
diff --git a/pycam/Plugins/OpenGLWindow.py b/pycam/Plugins/OpenGLWindow.py
index 896a54ac..430a139f 100644
--- a/pycam/Plugins/OpenGLWindow.py
+++ b/pycam/Plugins/OpenGLWindow.py
@@ -23,6 +23,7 @@
 from pycam.Geometry.PointUtils import pcross, pmul, pnormalized
 import pycam.Geometry.Matrix as Matrix
 import pycam.Plugins
+import numpy as np
 
 
 # The length of the distance vector does not matter - it will be normalized and
@@ -524,7 +525,8 @@ def glsetup(self, widget=None):
         GL.glPolygonOffset(1.0, 1.0)
         # ambient and diffuse material lighting is defined in OpenGLViewModel
         GL.glMaterial(GL.GL_FRONT_AND_BACK, GL.GL_SPECULAR, (1.0, 1.0, 1.0, 1.0))
-        GL.glMaterial(GL.GL_FRONT_AND_BACK, GL.GL_SHININESS, (100.0))
+        GL.glMaterial(GL.GL_FRONT_AND_BACK, GL.GL_SHININESS, np.array([100.0], dtype='float32'))
+
         if self.core.get("view_polygon"):
             GL.glPolygonMode(GL.GL_FRONT_AND_BACK, GL.GL_FILL)
         else:
diff --git a/pycam/Plugins/__init__.py b/pycam/Plugins/__init__.py
index 17b80b70..6452d968 100644
--- a/pycam/Plugins/__init__.py
+++ b/pycam/Plugins/__init__.py
@@ -17,7 +17,7 @@
 along with PyCAM.  If not, see <http://www.gnu.org/licenses/>.
 """
 
-import imp
+import importlib
 import inspect
 import os
 import uuid
@@ -242,6 +242,13 @@ def unregister_gtk_accelerator(self, groupname, action):
             ui_manager.remove_action_group(actiongroup)
 
 
+def find_module(mod_name, directory):
+    spec = importlib.machinery.PathFinder.find_spec(mod_name, [directory])
+    if spec is None:
+        raise ImportError(f"No module named {mod_name}")
+    return spec.loader, spec.origin, spec
+
+
 class PluginManager:
 
     def __init__(self, core):
@@ -268,12 +275,19 @@ def import_plugins(self, directory=None, ignore_names=None):
                     _log.info("Skipping plugin %s (marked as 'ignore')", mod_name)
                     continue
                 try:
-                    mod_file, mod_filename, mod_desc = imp.find_module(mod_name, [directory])
+                    # mod_file, mod_filename, mod_desc
+                    # mod_file, mod_filename, mod_desc = find_module(mod_name, [directory])
                     full_mod_name = "pycam.Plugins.%s" % mod_name
-                    mod = imp.load_module(full_mod_name, mod_file, mod_filename, mod_desc)
+                    # mod = importlib.load_module(full_mod_name, mod_file, mod_filename, mod_desc)
+                    spec = importlib.util.spec_from_file_location(full_mod_name, os.path.join(directory, filename))
+                    if spec is None:
+                        raise ImportError(f"No module named {mod_name}")
+                    mod = importlib.util.module_from_spec(spec)
+                    spec.loader.exec_module(mod)
                 except ImportError as exc:
                     _log.info("Skipping plugin %s: %s", os.path.join(directory, filename), exc)
                     continue
+                mod_filename = spec.origin
                 for attr in dir(mod):
                     item = getattr(mod, attr)
                     if inspect.isclass(item) and issubclass(item, PluginBase):
diff --git a/requirements.txt b/requirements.txt
index 40887f4c..860196c8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,10 @@
-PyOpenGL
-PyYAML
-svg.path
+iniconfig==2.0.0
+numpy==1.26.3
+packaging==23.2
+pluggy==1.4.0
+pycairo==1.25.1
+PyGObject==3.46.0
+PyOpenGL==3.1.7
+pytest==8.0.0
+PyYAML==6.0.1
+svg.path==6.3