diff --git a/configs/common/optimize b/configs/common/optimize
index a0dcae8..69153dc 100644
--- a/configs/common/optimize
+++ b/configs/common/optimize
@@ -1,13 +1,12 @@
 # based on https://github.com/glassd00r/Openwrt_Builder/blob/main/bpi-r4.config
 
-# set GCC14.1
+# set GCC15
 CONFIG_BUILD_PATENTED=y
 CONFIG_DEVEL=y
 CONFIG_EXPERIMENTAL=y
+
+CONFIG_GCC_USE_VERSION_15=y
 CONFIG_TOOLCHAINOPTS=y
-CONFIG_GCC_USE_VERSION_14=y
-CONFIG_GCC_VERSION_14=y
-CONFIG_GCC_VERSION="14.1.0"
 
 CONFIG_ZLIB_OPTIMIZE_SPEED=y
 CONFIG_ZSTD_OPTIMIZE_O3=y
@@ -15,6 +14,7 @@ CONFIG_ZSTD_OPTIMIZE_O3=y
 CONFIG_GCC_USE_GRAPHITE=y
 CONFIG_USE_GC_SECTIONS=y
 CONFIG_USE_LTO=y
+CONFIG_USE_MKLIBS=y
 CONFIG_USE_MOLD=y
 
 # CONFIG_KERNEL_CC_STACKPROTECTOR_STRONG is not set