diff --git a/ptgaze/common/face_model.py b/ptgaze/common/face_model.py
index 5aca3f8..0d96d6a 100644
--- a/ptgaze/common/face_model.py
+++ b/ptgaze/common/face_model.py
@@ -26,8 +26,8 @@ def estimate_head_pose(self, face: Face, camera: Camera) -> None:
         # The default values of rvec and tvec below mean that the
         # initial estimate of the head pose is not rotated and the
         # face is in front of the camera.
-        rvec = np.zeros(3, dtype=np.float)
-        tvec = np.array([0, 0, 1], dtype=np.float)
+        rvec = np.zeros(3, dtype=float)
+        tvec = np.array([0, 0, 1], dtype=float)
         _, rvec, tvec = cv2.solvePnP(self.LANDMARKS,
                                      face.landmarks,
                                      camera.camera_matrix,