diff --git a/.circleci/config.yml b/.circleci/config.yml
index 3863f72..e459df1 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -18,7 +18,7 @@ jobs:
             git submodule update --init --recursive
       # Use cached mlir installation if possible.
       - restore_cache:
-          key: V6-LLVM-PROJECT-{{ arch }}
+          key: V9-LLVM-PROJECT-{{ arch }}
       - run:
           name: Install MLIR
           command: |
@@ -29,7 +29,7 @@ jobs:
               source ONNF/utils/install-mlir.sh
             fi
       - save_cache:
-          key: V6-LLVM-PROJECT-{{ arch }}
+          key: V9-LLVM-PROJECT-{{ arch }}
           paths:
             - llvm-project
       - run:
diff --git a/README.md b/README.md
index 62c2f25..b1266b9 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 # ONNF
 Open Neural Network Frontend : an ONNX frontend for MLIR.
 
-[![CircleCI](https://circleci.com/gh/clang-ykt/ONNF.svg?style=svg)](https://circleci.com/gh/clang-ykt/ONNF)
+[![CircleCI](https://circleci.com/gh/onnx/onnx-mlir/tree/master.svg?style=svg)](https://circleci.com/gh/onnx/onnx-mlir/tree/master)
 
 ## Prerequisites
 
@@ -18,6 +18,8 @@ Firstly, install MLIR (as a part of LLVM-Project):
 [same-as-file]: <> (utils/install-mlir.sh)
 ``` bash
 git clone https://github.com/llvm/llvm-project.git
+# Check out a specific branch that is known to work with ONNF.
+cd llvm-project && git checkout 076475713c236081a3247a53e9dbab9043c3eac2 && cd ..
 mkdir llvm-project/build
 cd llvm-project/build
 cmake -G Ninja ../llvm \
diff --git a/utils/install-mlir.sh b/utils/install-mlir.sh
index 39f06ea..b995b06 100644
--- a/utils/install-mlir.sh
+++ b/utils/install-mlir.sh
@@ -1,4 +1,6 @@
 git clone https://github.com/llvm/llvm-project.git
+# Check out a specific branch that is known to work with ONNF.
+cd llvm-project && git checkout 076475713c236081a3247a53e9dbab9043c3eac2 && cd ..
 mkdir llvm-project/build
 cd llvm-project/build
 cmake -G Ninja ../llvm \