diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index de0dda1ac..539600982 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-24.04
 
     env:
-      LLVM_VERSION: 21
+      LLVM_VERSION: 22
 
     steps:
       - name: Checkout code
diff --git a/openasip/configure.ac b/openasip/configure.ac
index c322daea5..5300a94b9 100644
--- a/openasip/configure.ac
+++ b/openasip/configure.ac
@@ -561,9 +561,9 @@ case "$LLVM_VERSION" in
      22.*)
      AC_DEFINE([LLVM_22], [], "Using LLVM 22 (git)")
      LLVM_VERSION=22
-     LLVM_LIBRARYVERSION=22git
+     LLVM_LIBRARYVERSION=22-rc1
      LLVM_SHARED_LIB_FILE=$LLVM_LIBDIR/libLLVM-$LLVM_LIBRARYVERSION$LIBRARY_SUFFIX
-     LLVM_SHARED_LIB=-lLLVM-22git
+     LLVM_SHARED_LIB=-lLLVM-${LLVM_LIBRARYVERSION}
      LLVM_LDFLAGS="$($llvmConf --ldflags) $LLVM_SHARED_LIB"
      # The upstream LLVM doesn't (yet) have the RISC-V customization support.
      ENABLE_RISCV=false
diff --git a/openasip/tools/scripts/install_llvm_22.sh b/openasip/tools/scripts/install_llvm_22.sh
new file mode 100755
index 000000000..9c0173233
--- /dev/null
+++ b/openasip/tools/scripts/install_llvm_22.sh
@@ -0,0 +1,75 @@
+#!/bin/bash
+
+TARGET_DIR=${1:?"Missing installation directory argument"}
+ON_PATCH_FAIL="exit 1"
+
+if test "x$2" == "x--debug-build";
+then
+LLVM_BUILD_MODE="-DCMAKE_BUILD_TYPE=Debug -DLLVM_ENABLE_ASSERTIONS=ON"
+export CFLAGS=-O0
+export CPPFLAGS=-O0
+export CXXFLAGS=-O0
+build_dir=llvm-build-Debug
+else
+export CFLAGS=-O3
+export CPPFLAGS=-O3
+export CXXFLAGS=-O3
+LLVM_BUILD_MODE="-DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_ASSERTIONS=ON"
+build_dir=llvm-build-Release
+fi
+
+echo "### LLVM build mode: "$LLVM_BUILD_MODE
+
+script_dir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+patch_dir=$script_dir/../patches
+llvm_co_dir=release_21
+llvm_branch=openasip-llvm-22-patched
+
+mkdir -p $build_dir
+cd $build_dir
+
+function eexit {
+   echo "$1"
+   exit 1
+}
+
+function fetch_llvm {
+    REV_TO_FETCH=$1
+    if [ -n "$REV_TO_FETCH" ]; then
+        REV_TO_FETCH="-r$REV_TO_FETCH"
+    fi
+
+    if ! test -d $llvm_co_dir;
+    then
+        git clone --single-branch --depth=1 --branch $llvm_branch https://github.com/cpc/llvmtce.git $llvm_co_dir\
+            || eexit "Git clone $REV_TOFETCH from llvm failed"
+    else
+        cd $llvm_co_dir;
+        git checkout $llvm_branch ||	eexit "checking out git branch failed"
+        git fetch
+        git reset --hard $llvm_branch || eexit "resetting --hard HEAD failed"
+        cd ..;
+    fi
+}
+
+fetch_llvm
+
+cd $llvm_co_dir
+mkdir -p build
+cd build
+
+# -DLLVM_ENABLE_Z3_SOLVER=OFF due to the issue described in
+# https://reviews.llvm.org/D54978#1390652
+# You might also need to delete libz3-dev.
+# This appears at least with Ubuntu 18.04.
+cmake ../llvm/ -DLLVM_ENABLE_PROJECTS="clang;lld" \
+    -G "Unix Makefiles" \
+    $LLVM_BUILD_MODE\
+    -DCMAKE_INSTALL_PREFIX=$TARGET_DIR \
+    -DLLVM_TARGETS_TO_BUILD="X86" \
+    -DLLVM_LINK_LLVM_DYLIB=TRUE \
+    -DLLVM_ENABLE_RTTI=TRUE \
+    -DLLVM_ENABLE_Z3_SOLVER=OFF \
+    || eexit "Configuring LLVM/Clang failed."
+make -j$(nproc) || eexit "Building LLVM/Clang failed."
+make install || eexit "Installation of LLVM/Clang failed."