diff --git a/requirements.txt b/requirements.txt
index aa39701..bb83987 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,5 @@
 numpy
 matplotlib
 scipy
-ray
 toml
 tqdm
\ No newline at end of file
diff --git a/setup.cfg b/setup.cfg
index 39d428b..fa612cb 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -23,8 +23,6 @@ install_requires =
     numba
     matplotlib
     scipy
-    ray
-    send2trash
     toml
     tqdm
 
diff --git a/src/scgenerator/cli/cli.py b/src/scgenerator/cli/cli.py
index 11a5398..2bd9e72 100644
--- a/src/scgenerator/cli/cli.py
+++ b/src/scgenerator/cli/cli.py
@@ -3,7 +3,10 @@ import os
 from pathlib import Path
 import random
 
-import ray
+try:
+    import ray
+except ImportError:
+    ray = None
 
 from scgenerator.physics.simulate import (
     run_simulation_sequence,
@@ -84,18 +87,19 @@ def merge(args):
 
 
 def prep_ray(args):
-    if args.start_ray:
-        init_str = ray.init()
-    elif not args.no_ray:
-        try:
-            init_str = ray.init(
-                address="auto",
-                # _node_ip_address=os.environ.get("ip_head", "127.0.0.1").split(":")[0],
-                _redis_password=os.environ.get("redis_password", "caco1234"),
-            )
-            print(init_str)
-        except ConnectionError:
-            pass
+    if ray:
+        if args.start_ray:
+            init_str = ray.init()
+        elif not args.no_ray:
+            try:
+                init_str = ray.init(
+                    address="auto",
+                    # _node_ip_address=os.environ.get("ip_head", "127.0.0.1").split(":")[0],
+                    _redis_password=os.environ.get("redis_password", "caco1234"),
+                )
+                print(init_str)
+            except ConnectionError:
+                pass
     return SequencialSimulations if args.no_ray else None
 
 
diff --git a/src/scgenerator/logger.py b/src/scgenerator/logger.py
index 9c592a0..e46af74 100644
--- a/src/scgenerator/logger.py
+++ b/src/scgenerator/logger.py
@@ -35,8 +35,8 @@ def _set_debug():
 
 def get_logger(name=None):
     """returns a logging.Logger instance. This function is there because if scgenerator
-    is used with ray, workers are not aware of any configuration done with the logging
-    and so it must be reconfigured.
+    is used with some multiprocessing library, workers are not aware of any configuration done
+    with the logging and so it must be reconfigured.
 
     Parameters
     ----------
diff --git a/src/scgenerator/physics/simulate.py b/src/scgenerator/physics/simulate.py
index f2c2e16..23277d0 100644
--- a/src/scgenerator/physics/simulate.py
+++ b/src/scgenerator/physics/simulate.py
@@ -1,25 +1,20 @@
 import multiprocessing
 import os
-import sys
 from datetime import datetime
 from typing import Any, Dict, List, Tuple, Type
 
 import numpy as np
-from tqdm import tqdm
 
-from .. import initialize, io, utils, const, env
+from .. import env, initialize, io, utils
 from ..errors import IncompleteDataFolderError
 from ..logger import get_logger
 from . import pulse
 from .fiber import create_non_linear_op, fast_dispersion_op
 
-using_ray = False
 try:
     import ray
-
-    using_ray = True
 except ModuleNotFoundError:
-    pass
+    ray = None
 
 
 class RK4IP:
@@ -419,7 +414,7 @@ class Simulations:
             if isinstance(method, str):
                 method = Simulations.simulation_methods_dict[method]
             return method(param_seq, task_id)
-        elif param_seq.num_sim > 1 and param_seq["simulation", "parallel"] and using_ray:
+        elif param_seq.num_sim > 1 and param_seq["simulation", "parallel"]:
             return Simulations.get_best_method()(param_seq, task_id)
         else:
             return SequencialSimulations(param_seq, task_id)
@@ -435,6 +430,8 @@ class Simulations:
         data_folder : str, optional
             path to the folder where data is saved, by default "scgenerator/"
         """
+        if not self.is_available():
+            raise RuntimeError(f"{self.__class__} is currently not available")
         self.logger = io.get_logger(__name__)
         self.id = int(task_id)
 
@@ -600,7 +597,9 @@ class RaySimulations(Simulations, priority=2):
 
     @classmethod
     def is_available(cls):
-        return using_ray and ray.is_initialized()
+        if ray:
+            return ray.is_initialized()
+        return False
 
     def __init__(
         self,
@@ -737,9 +736,4 @@ def resume_simulations(sim_dir: str, method: Type[Simulations] = None) -> Simula
 
 
 if __name__ == "__main__":
-    try:
-        ray.init()
-    except NameError:
-        pass
-    config_file, *opts = sys.argv[1:]
-    new_simulation(config_file, *opts)
+    pass