diff --git a/.gitmodules b/.gitmodules
index 664ce429..9cb64bc4 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,6 +1,6 @@
 [submodule "crosstool-ng"]
 	path = crosstool-ng
-	url = https://github.com/zephyrproject-rtos/crosstool-ng.git
+	url = https://github.com/renesas/crosstool-ng.git
 [submodule "binutils"]
 	path = binutils
 	url = https://github.com/zephyrproject-rtos/binutils-gdb.git
@@ -9,13 +9,13 @@
 	url = https://github.com/zephyrproject-rtos/newlib-cygwin.git
 [submodule "gcc"]
 	path = gcc
-	url = https://github.com/zephyrproject-rtos/gcc.git
+	url = https://github.com/renesas/gcc.git
 [submodule "gdb"]
 	path = gdb
 	url = https://github.com/zephyrproject-rtos/binutils-gdb.git
 [submodule "picolibc"]
 	path = picolibc
-	url = https://github.com/zephyrproject-rtos/picolibc.git
+	url = https://github.com/renesas/picolibc.git
 [submodule "crosskit-x86_64-apple-darwin"]
 	path = crosskit/crosskit-x86_64-apple-darwin
 	url = https://github.com/zephyrproject-rtos/crosskit-x86_64-apple-darwin.git
diff --git a/cmake/zephyr/target.cmake b/cmake/zephyr/target.cmake
index 2d485778..8fc12ebf 100644
--- a/cmake/zephyr/target.cmake
+++ b/cmake/zephyr/target.cmake
@@ -10,6 +10,7 @@ set(CROSS_COMPILE_TARGET_arm64   aarch64-zephyr-elf)
 set(CROSS_COMPILE_TARGET_nios2     nios2-zephyr-elf)
 set(CROSS_COMPILE_TARGET_riscv   riscv64-zephyr-elf)
 set(CROSS_COMPILE_TARGET_mips       mips-zephyr-elf)
+set(CROSS_COMPILE_TARGET_rx           rx-zephyr-elf)
 set(CROSS_COMPILE_TARGET_microblaze microblazeel-zephyr-elf)
 set(CROSS_COMPILE_TARGET_xtensa   xtensa-${SOC_TOOLCHAIN_NAME}_zephyr-elf)
 
diff --git a/configs/rx-zephyr-elf.config b/configs/rx-zephyr-elf.config
new file mode 100644
index 00000000..157cb336
--- /dev/null
+++ b/configs/rx-zephyr-elf.config
@@ -0,0 +1,6 @@
+CT_CONFIG_VERSION="3"
+CT_EXPERIMENTAL=y
+CT_ARCH_RX=y
+CT_TARGET_CFLAGS="-ftls-model=local-exec"
+CT_TARGET_VENDOR="zephyr"
+CT_MULTILIB=y
diff --git a/crosstool-ng b/crosstool-ng
index 53b5327d..2c07faf2 160000
--- a/crosstool-ng
+++ b/crosstool-ng
@@ -1 +1 @@
-Subproject commit 53b5327d821a6b6949fa455f14a9631146af897c
+Subproject commit 2c07faf2989dce986c10740c0cd8a22bb62d8b88
diff --git a/gcc b/gcc
index 428d8d7b..b56eaea8 160000
--- a/gcc
+++ b/gcc
@@ -1 +1 @@
-Subproject commit 428d8d7b0542338244ca41ac06a5f3fa4f29bb6d
+Subproject commit b56eaea866c876cd15ab79d17e06965846bce6b3
diff --git a/picolibc b/picolibc
index d492d5fa..5b0f2d56 160000
--- a/picolibc
+++ b/picolibc
@@ -1 +1 @@
-Subproject commit d492d5fa7c96918e37653f303028346bb0dd51a2
+Subproject commit 5b0f2d56c755ef804a32bb4541dc62110ddfbecf