diff --git a/jcvi/assembly/chic.pyx b/jcvi/assembly/chic.pyx
index 5439b617..cd526243 100644
--- a/jcvi/assembly/chic.pyx
+++ b/jcvi/assembly/chic.pyx
@@ -22,7 +22,7 @@ from cpython cimport array
 import array
 
 
-ctypedef np.int_t INT
+ctypedef np.int INT
 DEF LIMIT = 10000000
 DEF BB = 12
 cdef int *GR = \
diff --git a/setup.cfg b/setup.cfg
index a37e99db..547730ae 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -49,7 +49,7 @@ install_requires =
     more-itertools
     natsort
     networkx
-    numpy
+    numpy<2
     ortools
     pybedtools
     pyefd