diff --git a/.circleci/config.yml b/.circleci/config.yml
index 6d5e40256f..ac5530ad2a 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -7,8 +7,8 @@ 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-2020-12-20
-      - run: rustup override set nightly-2020-12-20
+      - 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
diff --git a/core/src/main/rust/shadowsocks-rust b/core/src/main/rust/shadowsocks-rust
index 3a1054acc5..303f96c61f 160000
--- a/core/src/main/rust/shadowsocks-rust
+++ b/core/src/main/rust/shadowsocks-rust
@@ -1 +1 @@
-Subproject commit 3a1054acc54cfc23a1cd232aa0a45b66af4bd612
+Subproject commit 303f96c61f520f447589467339a160ad118011d6