diff --git a/.ci/build-freebsd.sh b/.ci/build-freebsd.sh
index 8e1eafc39be3..2ea6ee3a2eac 100755
--- a/.ci/build-freebsd.sh
+++ b/.ci/build-freebsd.sh
@@ -7,7 +7,7 @@ git submodule -q update --init --depth 1 $(awk '/path/ && !/llvm/ && !/SPIRV/ {
 
 # Prefer newer Clang than in base system (see also .ci/install-freebsd.sh)
 # libc++ isn't in llvm* packages, so download manually
-fetch https://github.com/llvm/llvm-project/releases/download/llvmorg-16.0.1/llvm-project-16.0.1.src.tar.xz
+fetch https://github.com/llvm/llvm-project/releases/download/llvmorg-18.1.8/llvm-project-18.1.8.src.tar.xz
 tar xf llvm*.tar.xz
 export CC=clang16 CXX=clang++16
 cmake -B libcxx_build -G Ninja -S llvm*/libcxx \
diff --git a/.ci/setup-windows.sh b/.ci/setup-windows.sh
index ea2fd7e0b3bd..fbcd68a91c0d 100755
--- a/.ci/setup-windows.sh
+++ b/.ci/setup-windows.sh
@@ -19,7 +19,7 @@ QT_DECL_URL="${QT_HOST}${QT_PREFIX}${QT_PREFIX_2}qtdeclarative${QT_SUFFIX}"
 QT_TOOL_URL="${QT_HOST}${QT_PREFIX}${QT_PREFIX_2}qttools${QT_SUFFIX}"
 QT_MM_URL="${QT_HOST}${QT_PREFIX}addons.qtmultimedia.${QT_PREFIX_2}qtmultimedia${QT_SUFFIX}"
 QT_SVG_URL="${QT_HOST}${QT_PREFIX}${QT_PREFIX_2}qtsvg${QT_SUFFIX}"
-LLVMLIBS_URL='https://github.com/RPCS3/llvm-mirror/releases/download/custom-build-win-16.0.1/llvmlibs_mt.7z'
+LLVMLIBS_URL='https://github.com/RPCS3/llvm-mirror/releases/download/custom-build-win-18.1.8/llvmlibs_mt.7z'
 GLSLANG_URL='https://github.com/RPCS3/glslang/releases/latest/download/glslanglibs_mt.7z'
 VULKAN_SDK_URL="https://www.dropbox.com/scl/fi/sjjh0fc4ld281pjbl2xzu/VulkanSDK-1.3.268.0-Installer.exe?rlkey=f6wzc0lvms5vwkt2z3qabfv9d&dl=1"