diff --git a/Cargo.lock b/Cargo.lock
index 0d77f6c..9013401 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1572,7 +1572,7 @@ dependencies = [
 [[package]]
 name = "detee-sgx"
 version = "0.1.0"
-source = "git+https://gitea.detee.cloud/general/detee-sgx#f7eaed1392ae79ecc1105a50d919026f016a4e78"
+source = "git+https://gitea.detee.cloud/general/detee-sgx?branch=dthc#8ced0efcbac57f118b202785c783f2a7d39bf700"
 dependencies = [
  "aes-gcm",
  "hex",
diff --git a/README.md b/README.md
index 4a2ae09..794a6da 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,10 @@ Do the following steps to build the challenge:
 
 ```bash
 # Notice that there is no SGX device mounted, run inside rewrite directory
-docker run --rm --name packager -it -v .:/root/rewrite occlum/occlum:latest-ubuntu20.04
+docker run --rm --name packager -it -v .:/root/rewrite detee/occlum:0.30.1-ubuntu20.04
+# If you are running the packager on Mac, don't forget to set the VMM to QEMU (Legacy),
+# and run the following command once you are inside the container
+ln -s /usr/local/occlum/bin/x86_64-linux-musl-ar /usr/local/occlum/bin/musl-ar
 # Inside the docker container run package.sh and follow its instructions
 cd /root/rewrite && ./scripts/package.sh --prep
 exit # Feel free to exit the container
diff --git a/docker/challenge.Dockerfile b/docker/challenge.Dockerfile
index ab01f6a..b3c05ab 100644
--- a/docker/challenge.Dockerfile
+++ b/docker/challenge.Dockerfile
@@ -1,4 +1,4 @@
-FROM occlum/occlum:latest-ubuntu20.04 AS build
+FROM detee/occlum:0.30.1-ubuntu20.04 AS build
 
 WORKDIR /
 RUN mkdir sgx_libs &&\
diff --git a/scripts/package.sh b/scripts/package.sh
index afeb8c9..a4a2b11 100755
--- a/scripts/package.sh
+++ b/scripts/package.sh
@@ -7,11 +7,6 @@ cd "$script_dir/.."
 prerequisites=$1
 
 if [ "$prerequisites" == "--prep" ]; then
-    echo "Building the occlum fork"
-    [ -d occlum ] || git clone https://gitea.detee.cloud/general/occlum.git
-    (cd occlum && make submodule)
-    (cd occlum/tools/toolchains/utils_lib && ./build.sh)
-
     echo "Preparing the packager environment"
     apt update && apt install -y openssh-client
     rustup install 1.84.0