diff --git a/changes/402.fixed b/changes/402.fixed
new file mode 100644
index 00000000..ca312c30
--- /dev/null
+++ b/changes/402.fixed
@@ -0,0 +1 @@
+Fixed nxos install_os failing due to using the default timeout on the long running `install all` command.
diff --git a/pyntc/devices/nxos_device.py b/pyntc/devices/nxos_device.py
index ac949aa6..8583cbbc 100644
--- a/pyntc/devices/nxos_device.py
+++ b/pyntc/devices/nxos_device.py
@@ -896,10 +896,16 @@ def set_boot_options(self, image_name, kickstart=None, reboot=True, **vendor_spe
                 reboot_arg = " no-reload"
             try:
                 if kickstart is None:
-                    self.show_netmiko(f"install all nxos {image_name}{reboot_arg}", raw_text=True)
+                    self.show_netmiko(
+                        f"install all nxos {image_name}{reboot_arg}",
+                        read_timeout=3600,
+                        raw_text=True,
+                    )
                 else:
                     self.show_netmiko(
-                        f"install all system {image_name} kickstart {kickstart}{reboot_arg}", raw_text=True
+                        f"install all system {image_name} kickstart {kickstart}{reboot_arg}",
+                        read_timeout=3600,
+                        raw_text=True,
                     )
             except (NetmikoBaseException, NetmikoTimeoutException):
                 pass