diff --git a/pykalman/tests/test_unscented.py b/pykalman/tests/test_unscented.py
index 47cf150..d2e6d59 100644
--- a/pykalman/tests/test_unscented.py
+++ b/pykalman/tests/test_unscented.py
@@ -59,7 +59,7 @@ def check_dims(n_dim_state, n_dim_obs, n_func_args, kf_cls, kwargs):
         if not 'transition_functions' in kwargs
         else (len(kwargs['transition_functions']),)
     )
-    assert all([len(inspect.getargspec(f).args) == n_func_args
+    assert all([len(inspect.getfullargspec(f).args) == n_func_args
             for f in transition_functions])
     assert transition_covariance.shape == (n_dim_state, n_dim_state)
     assert (
@@ -67,7 +67,7 @@ def check_dims(n_dim_state, n_dim_obs, n_func_args, kf_cls, kwargs):
         if not 'observation_functions' in kwargs
         else (len(kwargs['observation_functions']),)
     )
-    assert all([len(inspect.getargspec(f).args) == n_func_args
+    assert all([len(inspect.getfullargspec(f).args) == n_func_args
           for f in observation_functions])
     assert observation_covariance.shape == (n_dim_obs, n_dim_obs)
     assert initial_state_mean.shape == (n_dim_state,)
diff --git a/pykalman/utils.py b/pykalman/utils.py
index 3f6356f..c6a099e 100644
--- a/pykalman/utils.py
+++ b/pykalman/utils.py
@@ -102,7 +102,7 @@ def get_params(obj):
     '''Get names and values of all parameters in `obj`'s __init__'''
     try:
         # get names of every variable in the argument
-        args = inspect.getargspec(obj.__init__)[0]
+        args = inspect.getfullargspec(obj.__init__)[0]
         args.pop(0)   # remove "self"
 
         # get values for each of the above in the object