diff --git a/.github/workflows/premerge.yml b/.github/workflows/premerge.yml
new file mode 100644
index 0000000..59e052e
--- /dev/null
+++ b/.github/workflows/premerge.yml
@@ -0,0 +1,33 @@
+name: Premerge
+
+on:
+  pull_request:
+    branches: [ "main" ]
+
+env:
+  BUILD_TYPE: Release
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Install LLVM
+      run: |
+        wget https://apt.llvm.org/llvm.sh
+        chmod +x llvm.sh
+        sudo ./llvm.sh 20 all
+        sudo apt install libmlir-20-dev mlir-20-tools
+
+    - name: Configure CMake
+      run: cmake -B ${{github.workspace}}/build -DCMAKE_BUILD_TYPE=${{env.BUILD_TYPE}}
+
+    - name: Build
+      run: cmake --build ${{github.workspace}}/build --config ${{env.BUILD_TYPE}}
+
+    - name: Test
+      working-directory: ${{github.workspace}}/build
+      run: cmake --build ${{github.workspace}}/build --config ${{env.BUILD_TYPE}} --target test
+
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 0855266..a2e5e76 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -298,7 +298,7 @@ target_link_libraries(python-cpp
 )
 
 # LLVM backend
-find_package(LLVM CONFIG 20.0)
+find_package(LLVM CONFIG 20.1)
 if(ENABLE_LLVM_BACKEND AND NOT LLVM_FOUND)
   message(FATAL_ERROR "Could not find LLVM in the local environment")
 elseif(ENABLE_LLVM_BACKEND AND LLVM_FOUND)
diff --git a/src/executable/mlir/CMakeLists.txt b/src/executable/mlir/CMakeLists.txt
index 060a16c..dee5c9f 100644
--- a/src/executable/mlir/CMakeLists.txt
+++ b/src/executable/mlir/CMakeLists.txt
@@ -1,4 +1,4 @@
-find_package(LLVM 20.0 REQUIRED CONFIG)
+find_package(LLVM 20.1 REQUIRED CONFIG)
 message(STATUS "Using LLVMConfig.cmake in: ${LLVM_DIR}")
 
 find_package(MLIR CONFIG REQUIRED