diff --git a/nd2reader/raw_metadata.py b/nd2reader/raw_metadata.py
index 1152219..f8acd50 100644
--- a/nd2reader/raw_metadata.py
+++ b/nd2reader/raw_metadata.py
@@ -293,9 +293,9 @@ def _parse_roi(self, raw_roi_dict):
             roi_dict = self._parse_vect_anim(roi_dict, raw_roi_dict[six.b('m_vectAnimParams_%d' % i)])
 
         # convert to NumPy arrays
-        roi_dict["timepoints"] = np.array(roi_dict["timepoints"], dtype=np.float)
-        roi_dict["positions"] = np.array(roi_dict["positions"], dtype=np.float)
-        roi_dict["sizes"] = np.array(roi_dict["sizes"], dtype=np.float)
+        roi_dict["timepoints"] = np.array(roi_dict["timepoints"], dtype=np.float64)
+        roi_dict["positions"] = np.array(roi_dict["positions"], dtype=np.float64)
+        roi_dict["sizes"] = np.array(roi_dict["sizes"], dtype=np.float64)
 
         return roi_dict
 
diff --git a/nd2reader/reader.py b/nd2reader/reader.py
index 4e14f42..7bef373 100644
--- a/nd2reader/reader.py
+++ b/nd2reader/reader.py
@@ -227,7 +227,7 @@ def get_timesteps(self):
             return self._timesteps
 
         self._timesteps = (
-            np.array(list(self._parser._raw_metadata.acquisition_times), dtype=np.float)
+            np.array(list(self._parser._raw_metadata.acquisition_times), dtype=np.float64)
             * 1000.0
         )
 
diff --git a/requirements.txt b/requirements.txt
index b8ab71a..bb96786 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-numpy>=1.14
+numpy>=1.20
 six>=1.4
 xmltodict>=0.9.2
 pims>=0.3.0