diff --git a/dts/xtensa/intel/intel_adsp_ace20_lnl.dtsi b/dts/xtensa/intel/intel_adsp_ace20_lnl.dtsi
index 964c5be06ab..b5f57ac5183 100644
--- a/dts/xtensa/intel/intel_adsp_ace20_lnl.dtsi
+++ b/dts/xtensa/intel/intel_adsp_ace20_lnl.dtsi
@@ -42,6 +42,13 @@
 			cpu-power-states = <&d0i3 &d3>;
 		};
 
+		cpu4: cpu@4 {
+			device_type = "cpu";
+			compatible = "cdns,tensilica-xtensa-lx7";
+			reg = <4>;
+			cpu-power-states = <&d0i3 &d3>;
+		};
+
 	};
 
 	power-states {
diff --git a/kernel/Kconfig b/kernel/Kconfig
index 797a98beb2a..b7c6864b871 100644
--- a/kernel/Kconfig
+++ b/kernel/Kconfig
@@ -874,7 +874,7 @@ config SMP_BOOT_DELAY
 config MP_NUM_CPUS
 	int "Number of CPUs/cores"
 	default MP_MAX_NUM_CPUS
-	range 1 4
+	range 1 5
 	help
 	  Number of multiprocessing-capable cores available to the
 	  multicpu API and SMP features.
@@ -882,7 +882,7 @@ config MP_NUM_CPUS
 config MP_MAX_NUM_CPUS
 	int "Maximum number of CPUs/cores"
 	default 1
-	range 1 4
+	range 1 5
 	help
 	  Maximum number of multiprocessing-capable cores available to the
 	  multicpu API and SMP features.
diff --git a/soc/xtensa/intel_adsp/ace/Kconfig.defconfig.ace20_lnl b/soc/xtensa/intel_adsp/ace/Kconfig.defconfig.ace20_lnl
index 35f35811261..2dc9365ffb5 100644
--- a/soc/xtensa/intel_adsp/ace/Kconfig.defconfig.ace20_lnl
+++ b/soc/xtensa/intel_adsp/ace/Kconfig.defconfig.ace20_lnl
@@ -9,6 +9,6 @@ config SOC
 	default "intel_ace20_lnl"
 
 config MP_MAX_NUM_CPUS
-	default 4
+	default 5
 
 endif