diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1ebaaf3f..0b3a1a7d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -70,11 +70,12 @@ jobs:
 
       - name: Install LLVM and MLIR deps
         run: |
-          sudo apt-get -y update
-          sudo apt-get install -y \
-            llvm-19-dev \
-            libmlir-19-dev \
-            mlir-19-tools
+          wget https://apt.llvm.org/llvm.sh
+          chmod +x llvm.sh
+          sudo ./llvm.sh 20
+          rm llvm.sh
+
+          sudo apt-get install -y libmlir-20-dev mlir-20-tools
 
       - name: Install unit tests requirements
         run: |
@@ -85,7 +86,7 @@ jobs:
         run: |
           . .venv/bin/activate
 
-          PATH=/usr/lib/llvm-19/bin:$PATH
+          PATH=/usr/lib/llvm-20/bin:$PATH
 
           cmake --preset default-mlir
 
diff --git a/scripts/build-mlir.mjs b/scripts/build-mlir.mjs
index 80c06bef..d65928e4 100644
--- a/scripts/build-mlir.mjs
+++ b/scripts/build-mlir.mjs
@@ -51,7 +51,7 @@ async function downloadLLVM({ packages, version, outdir }) {
 }
 
 async function main() {
-  const version = "20.1.2";
+  const version = "20.1.8";
   const packages = ["cmake", "third-party", "llvm", "mlir"];
 
   const llvm_source_dir = zx.path.resolve(
diff --git a/src/mlir/CMakeLists.txt b/src/mlir/CMakeLists.txt
index 5d51a20e..afe3ace9 100644
--- a/src/mlir/CMakeLists.txt
+++ b/src/mlir/CMakeLists.txt
@@ -5,6 +5,10 @@ endif()
 
 find_package(MLIR REQUIRED CONFIG)
 
+if (MLIR_VERSION VERSION_LESS "20.0")
+    message(FATAL_ERROR "MLIR >= 20.0 is required")
+endif()
+
 LIST(APPEND CMAKE_MODULE_PATH "${MLIR_CMAKE_DIR}" "${LLVM_CMAKE_DIR}")
 
 include(AddMLIR)