diff --git a/.circleci/config.yml b/.circleci/config.yml
index ac5530ad2a..b274fdb624 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -7,11 +7,10 @@ jobs:
     environment:
       GRADLE_OPTS: -Dorg.gradle.workers.max=1 -Dorg.gradle.daemon=false -Dkotlin.compiler.execution.strategy="in-process"
     steps:
-      - run: rustup toolchain install nightly-2020-12-17
-      - run: rustup override set nightly-2020-12-17
-      - run: rustup target install armv7-linux-androideabi aarch64-linux-android i686-linux-android x86_64-linux-android
       - checkout
       - run: git submodule update --init --recursive
+      - run: rustup update
+      - run: cd core/src/main/rust/shadowsocks-rust && rustup target add armv7-linux-androideabi aarch64-linux-android i686-linux-android x86_64-linux-android
       - restore_cache:
           key: jars-{{ checksum "build.gradle.kts" }}
       - run:
diff --git a/README.md b/README.md
index 12e51f795a..a3ea7e628b 100644
--- a/README.md
+++ b/README.md
@@ -21,9 +21,8 @@ for Android TV ([beta](https://play.google.com/apps/testing/com.github.shadowsoc
 * Rust with Android targets installed  
 
 ```bash
-  $ rustup toolchain install nightly-2020-12-20
-  $ rustup override set nightly-2020-12-20
-  $ rustup target install armv7-linux-androideabi aarch64-linux-android i686-linux-android x86_64-linux-android
+  $ cd core/src/main/rust/shadowsocks-rust
+  $ rustup target add armv7-linux-androideabi aarch64-linux-android i686-linux-android x86_64-linux-android
 ```
 
 ### BUILD