diff --git a/hpobench/container/recipes/ml/Singularity.ml_mmfb b/hpobench/container/recipes/ml/Singularity.ml_mmfb
index cd8b3e6e..edba805c 100644
--- a/hpobench/container/recipes/ml/Singularity.ml_mmfb
+++ b/hpobench/container/recipes/ml/Singularity.ml_mmfb
@@ -12,10 +12,13 @@ VERSION v0.0.1
     cd /home \
     && git clone https://github.com/automl/HPOBench.git \
     && cd HPOBench \
-    && git checkout development \
+    && git checkout master \
     && pip install ".[ml_mfbb]" \
     && cd / \
     && mkdir /var/lib/hpobench/ \
+    && mkdir /var/lib/hpobench/cache \
+    && mkdir /var/lib/hpobench/data \
+    && mkdir /var/lib/hpobench/socket \
     && chmod -R 777 /var/lib/hpobench/ \
     && pip cache purge \
     && rm -rf /var/lib/apt/lists/*
diff --git a/hpobench/container/recipes/nas/Singularity.nasbench_201 b/hpobench/container/recipes/nas/Singularity.nasbench_201
index 4f4cdcf2..8b7ebe50 100644
--- a/hpobench/container/recipes/nas/Singularity.nasbench_201
+++ b/hpobench/container/recipes/nas/Singularity.nasbench_201
@@ -16,6 +16,9 @@ VERSION v0.0.1
     && pip install . \
     && cd / \
     && mkdir /var/lib/hpobench/ \
+    && mkdir /var/lib/hpobench/cache \
+    && mkdir /var/lib/hpobench/data \
+    && mkdir /var/lib/hpobench/socket \
     && chmod -R 777 /var/lib/hpobench/ \
     && rm -rf /var/lib/apt/lists/* \
     && pip cache purge
diff --git a/hpobench/container/server_abstract_benchmark.py b/hpobench/container/server_abstract_benchmark.py
index 85c6faa1..a7002f50 100644
--- a/hpobench/container/server_abstract_benchmark.py
+++ b/hpobench/container/server_abstract_benchmark.py
@@ -52,6 +52,10 @@ def __init__(self, socket_id):
         # start the event loop of the server to wait for calls
         self.daemon.requestLoop(loopCondition=lambda: self.pyro_running)
 
+    def print_hello_world(self):
+        logger.debug('Server: Hello World!')
+        return 'Hello World!'
+
     def init_benchmark(self, kwargs_str):
         try:
             kwargs = json.loads(kwargs_str, cls=BenchmarkDecoder)
@@ -128,5 +132,12 @@ def shutdown(self):
     args = parser.parse_args()
 
     # pylint: disable=logging-fstring-interpolation
+    logger.debug(f'args: {args}')
+    logger.debug(f'args.importBase: {args.importBase}')
+    logger.debug(f'args.benchmark: {args.benchmark}')
+    logger.debug(f'args.socket_id: {args.socket_id}')
     exec(f"from hpobench.benchmarks.{args.importBase} import {args.benchmark} as Benchmark")
+    logger.debug(f'import worked')
     bp = BenchmarkServer(args.socket_id)
+    logger.debug(f'BenchmarkServer started')
+    logger.debug(f'BenchmarkServer: {bp}')
diff --git a/hpobench/util/container_utils.py b/hpobench/util/container_utils.py
index 7fee19e9..22323f09 100644
--- a/hpobench/util/container_utils.py
+++ b/hpobench/util/container_utils.py
@@ -56,9 +56,9 @@ def object_hook(self, obj: Any) -> Union[Union[tuple, np.ndarray, float, float,
             if __type == 'np.ndarray':
                 return np.array(obj['__items__'])
             if __type == 'np.float':
-                return np.float(obj['__items__'])
+                return float(obj['__items__'])
             if __type == 'np.int':
-                return np.int(obj['__items__'])
+                return int(obj['__items__'])
             if __type == 'random_state':
                 return deserialize_random_state(obj['__items__'])
         return obj
diff --git a/setup.py b/setup.py
index 4c53ecb0..023779c3 100644
--- a/setup.py
+++ b/setup.py
@@ -36,7 +36,7 @@ def read_file(file_name):
     version=read_file('hpobench/__version__.py').split()[-1].strip('\''),
     packages=setuptools.find_packages(exclude=['*.tests', '*.tests.*',
                                                'tests.*', 'tests'],),
-    python_requires='>=3.6, <=3.10',
+    python_requires='>=3.6',
     install_requires=read_file('./requirements.txt').split('\n'),
     extras_require=get_extra_requirements(),
     test_suite='pytest',
@@ -48,6 +48,7 @@ def read_file(file_name):
         'Programming Language :: Python :: 3.8',
         'Programming Language :: Python :: 3.9',
         'Programming Language :: Python :: 3.10',
+        'Programming Language :: Python :: 3.11',
         'Development Status :: 3 - Alpha',
         'Natural Language :: English',
         'Environment :: Console',