diff --git a/nordicsemi/version.py b/nordicsemi/version.py
index 5594ceb..bb41bbd 100644
--- a/nordicsemi/version.py
+++ b/nordicsemi/version.py
@@ -37,4 +37,4 @@
 
 """ Version definition for nrfutil. """
 
-NRFUTIL_VERSION = "6.1.1"
+NRFUTIL_VERSION = "6.1.3"
diff --git a/requirements.txt b/requirements.txt
index c60ab9c..e0db39c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,7 +3,7 @@ click
 crcmod
 ecdsa
 intelhex
-libusb1
+libusb1==1.9.3
 pc_ble_driver_py >= 0.16.1
 piccata
 protobuf