diff --git a/rosco/toolbox/control_interface.py b/rosco/toolbox/control_interface.py
index 96c942b37..f8b7e1110 100644
--- a/rosco/toolbox/control_interface.py
+++ b/rosco/toolbox/control_interface.py
@@ -20,6 +20,7 @@
     create_string_buffer,
     c_int32,
     c_void_p,
+    wintypes,
 )
 import numpy as np
 import platform
@@ -258,6 +259,7 @@ def null_free_dll(*spam):  # pragma: no cover
 
         if OS == "Windows":  # pragma: Windows
             try:
+                ctypes.windll.kernel32.FreeLibrary.argtypes = [wintypes.HMODULE]
                 _dlclose = ctypes.windll.kernel32.FreeLibrary
                 dlclose = lambda handle: 0 if _dlclose(handle) else 1
             except:
diff --git a/rosco/toolbox/ofTools/fast_io/output_processing.py b/rosco/toolbox/ofTools/fast_io/output_processing.py
index bafe84bff..9eff7829d 100644
--- a/rosco/toolbox/ofTools/fast_io/output_processing.py
+++ b/rosco/toolbox/ofTools/fast_io/output_processing.py
@@ -366,7 +366,7 @@ def load_ascii_output(filename):
                 info['attribute_units'] = [unit[1:-1] for unit in f.readline().split()]
 
         # Data, up to end of file or empty line (potential comment line at the end)
-        data = np.array([l.strip().split() for l in takewhile(lambda x: len(x.strip())>0, f.readlines())]).astype(np.float_)
+        data = np.array([l.strip().split() for l in takewhile(lambda x: len(x.strip())>0, f.readlines())]).astype(np.float64)
         return data, info
 
 
diff --git a/rosco/toolbox/ofTools/util/FileTools.py b/rosco/toolbox/ofTools/util/FileTools.py
index 2262f10e4..4b9464432 100644
--- a/rosco/toolbox/ofTools/util/FileTools.py
+++ b/rosco/toolbox/ofTools/util/FileTools.py
@@ -32,7 +32,7 @@ def loop_dict(vartree, branch):
                 
                 if data_type in [np.int_, np.intc, np.intp, np.int8, np.int16, np.int32, np.int64, np.uint8, np.uint16, np.uint32, np.uint64]:
                     get_dict(fst_vt, branch_i[:-1])[branch_i[-1]] = int(get_dict(fst_vt, branch_i[:-1])[branch_i[-1]])
-                elif data_type in [np.single, np.double, np.longdouble, np.csingle, np.cdouble, np.float_, np.float16, np.float32, np.float64, np.complex64, np.complex128]:
+                elif data_type in [np.single, np.double, np.longdouble, np.csingle, np.cdouble, np.float16, np.float32, np.float64, np.complex64, np.complex128]:
                     get_dict(fst_vt, branch_i[:-1])[branch_i[-1]] = float(get_dict(fst_vt, branch_i[:-1])[branch_i[-1]])
                 elif data_type in [np.bool_]:
                     get_dict(fst_vt, branch_i[:-1])[branch_i[-1]] = bool(get_dict(fst_vt, branch_i[:-1])[branch_i[-1]])