diff --git a/.github/workflows/ci-build.yaml b/.github/workflows/ci-build.yaml
index db8c478..2d6b983 100644
--- a/.github/workflows/ci-build.yaml
+++ b/.github/workflows/ci-build.yaml
@@ -65,7 +65,7 @@ jobs:
         
   cmake-ubuntu:
     timeout-minutes: 5
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     steps:
       - uses: actions/setup-python@v5
         with:
@@ -95,7 +95,7 @@ jobs:
         
   cmake-ubuntu-python:
     timeout-minutes: 5
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     steps:
       - uses: actions/setup-python@v5
         with:
diff --git a/fmi4c.py b/fmi4c.py
index 70129be..5984585 100644
--- a/fmi4c.py
+++ b/fmi4c.py
@@ -168,7 +168,7 @@ def __init__(self):
         self.hdll.fmi1_getModelTypesPlatform.restype = ct.c_char_p
         self.hdll.fmi1_getModelTypesPlatform.argtypes = ct.c_void_p,
         self.hdll.fmi1_instantiateModel.restype = ct.c_void_p
-        self.hdll.fmi1_instantiateModel.argtypes = ct.c_void_p,ct.c_void_p,ct.c_void_p,ct.c_bool,
+        self.hdll.fmi1_instantiateModel.argtypes = ct.c_void_p,ct.c_void_p,ct.c_void_p,ct.c_void_p,ct.c_bool,
         self.hdll.fmi1_freeModelInstance.restype = None
         self.hdll.fmi1_freeModelInstance.argtypes = ct.c_void_p,
         self.hdll.fmi1_setTime.restype = ct.c_int
diff --git a/test/pytest.py b/test/pytest.py
index b2ae2b8..afae9fc 100644
--- a/test/pytest.py
+++ b/test/pytest.py
@@ -210,11 +210,11 @@ def verify(name, value):
 verify("version", version)
 
 instance = 0   
-instance = instantiateSuccess = f.fmi1_instantiateSlave(b"application/x-fmu-sharedlibrary", 1.0, False, False, False)
+instance = f.fmi1_instantiateSlave(b"application/x-fmu-sharedlibrary", 1.0, False, False, False)
 verify("instantiateSuccess", instance != 0)
 
 instance2 = 0   
-instance2 = instantiateSuccess = f.fmi1_instantiateSlave(b"application/x-fmu-sharedlibrary", 1.0, False, False, False)
+instance2 = f.fmi1_instantiateSlave(b"application/x-fmu-sharedlibrary", 1.0, False, False, False)
 verify("instantiateSuccess", instance2 != 0)
 
 setDebugLoggingSuccess = f.fmi1_setDebugLogging(instance, True)