diff --git a/build.sh b/build.sh
index bbd3e11..cdd7ede 100755
--- a/build.sh
+++ b/build.sh
@@ -22,7 +22,7 @@ mkdir -p "$WORKING_DIR"
 
 cd "$WORKING_DIR"
 if [ ! -d "$WORKING_DIR/llvm-project" ]; then
-    git clone https://github.com/apple/llvm-project.git
+    git clone --depth 1 --branch "$LLVM_BRANCH" https://github.com/apple/llvm-project.git
 fi
 cd "$WORKING_DIR/llvm-project"
 git reset --hard
diff --git a/config.sh b/config.sh
index 9a6d27e..3da698c 100644
--- a/config.sh
+++ b/config.sh
@@ -3,14 +3,13 @@
 # returned by the command below:
 # $ xcrun -sdk iphoneos swiftc --version
 
-LLVM_BRANCH="tags/swift-5.3.2-RELEASE"
+LLVM_BRANCH="swift-5.3.2-RELEASE"
 
 # 2. Select the best branch, tag or commit hash from https://github.com/rust-lang/rust
 
-RUST_BRANCH="a8486b64b" # nightly-2021-02-25
+RUST_BRANCH="bd41e09da334697c0f993b36685cb599061d9faa" # nightly-2021-10-19
 
 # 3. Select a name for the toolchain you want to install as. The toolchain will be installed
 # under $HOME/.rustup/toolchains/rust-$RUST_TOOLCHAIN
 
-RUST_TOOLCHAIN="ios-arm64-nightly-2021-02-25"
-
+RUST_TOOLCHAIN="ios-arm64-nightly-2021-10-19"