diff --git a/pyrivet/hilbert_distance.py b/pyrivet/hilbert_distance.py
index 88b6198..89e92f2 100644
--- a/pyrivet/hilbert_distance.py
+++ b/pyrivet/hilbert_distance.py
@@ -147,7 +147,7 @@ def make_compatible(self, other):
         left = left.add_col(dims[1].lower_bound)
         for bound in dims[1].upper_bounds:
             left = left.add_col(bound)
-        mat = left.mat.astype(np.float)
+        mat = left.mat.astype(np.float64)
         return SplitMat(mat, dims)
 
     def __add__(self, other):
@@ -163,7 +163,7 @@ def __add__(self, other):
         for bound in dims[1].upper_bounds:
             left = left.add_col(bound)
             right = right.add_col(bound)
-        mat = left.mat.astype(np.float) + right.mat.astype(np.float)
+        mat = left.mat.astype(np.float64) + right.mat.astype(np.float64)
         return SplitMat(mat, dims)
 
     def __neg__(self):
@@ -235,4 +235,4 @@ def betti_to_splitmat(betti: rivet.MultiBetti):
 
 
 def distance(left: rivet.MultiBetti, right: rivet.MultiBetti):
-    return betti_to_splitmat(left).distance(betti_to_splitmat(right))
\ No newline at end of file
+    return betti_to_splitmat(left).distance(betti_to_splitmat(right))