diff --git a/externals.json b/externals.json
index cc7f241..31b49c3 100644
--- a/externals.json
+++ b/externals.json
@@ -37,33 +37,33 @@
         {
             "path": "core_software/openamp/libmetal",
             "fetchurl": "https://github.com/OpenAMP/libmetal",
-            "revision": "main"
+            "revision": "v2023.04.0"
         },
         {
             "path": "core_software/openamp/openamp",
             "fetchurl": "https://github.com/OpenAMP/open-amp",
-            "revision": "main"
+            "revision": "v2023.04.0"
         },
         {
             "path": "core_software/rtos/freertos",
             "fetchurl": "https://github.com/aws/amazon-freertos.git",
-            "revision": "main"
+            "revision": "41244b002675843d44fc79c8752a87c344eaa855"
         },
         {
             "path": "core_software/rtos/freertos/freertos_kernel",
             "fetchurl": "https://github.com/FreeRTOS/FreeRTOS-Kernel.git",
-            "revision": "main" 
+            "revision": "a07f649bd50798cf7bd20325f12491c599a8bd39"
         },
         {
             "path": "core_software/rtos/threadx",
             "name": "linaro",
             "fetchurl": "https://github.com/Linaro/threadx",
-            "revision": "mps3_an547"
+            "revision": "20ae996c12b6e693db51d5b523d22cd248513702"
         },
         {
             "path": "core_software/tflite_micro",
             "fetchurl": "https://github.com/tensorflow/tflite-micro",
-            "revision": "main"
+            "revision": "384dd272f28ea7a99f5f7c211c9791f73cdb301b"
         },
         {
             "path": "linux_driver_stack",