diff --git a/src/qibojit/backends/cpu.py b/src/qibojit/backends/cpu.py
index 97c7062..74ae7e5 100644
--- a/src/qibojit/backends/cpu.py
+++ b/src/qibojit/backends/cpu.py
@@ -1,7 +1,4 @@
-import sys
-
 import numpy as np
-import psutil
 from qibo.backends.numpy import NumpyBackend
 from qibo.config import log
 from qibo.gates.abstract import ParametrizedGate
diff --git a/src/qibojit/custom_operators/ops.py b/src/qibojit/custom_operators/ops.py
index e6ea54e..47fd07a 100644
--- a/src/qibojit/custom_operators/ops.py
+++ b/src/qibojit/custom_operators/ops.py
@@ -1,5 +1,4 @@
 import numpy as np
-import psutil
 from numba import njit, prange