diff --git a/lib/ngx-wasm-rs/lib/backtrace/src/c_api.rs b/lib/ngx-wasm-rs/lib/backtrace/src/c_api.rs
index 4f26f45be..812d3b03e 100644
--- a/lib/ngx-wasm-rs/lib/backtrace/src/c_api.rs
+++ b/lib/ngx-wasm-rs/lib/backtrace/src/c_api.rs
@@ -39,9 +39,10 @@ impl Drop for ngx_wasm_backtrace_name_table_t {
 
 fn vec_into_wasm_byte_vec_t(bv: *mut wasm_byte_vec_t, v: Vec<u8>) {
     unsafe {
-        let (ptr, len, _cap) = v.into_raw_parts();
-        (*bv).size = len;
-        (*bv).data = ptr;
+        // FIXME Update this when vec_into_raw_parts is stabilized
+        let mut v = mem::ManuallyDrop::new(v);
+        (*bv).size = v.len();
+        (*bv).data = v.as_mut_ptr();
     }
 }
 
@@ -63,22 +64,24 @@ pub unsafe extern "C" fn ngx_wasm_backtrace_get_name_table(
 
         let mut names = Vec::<ngx_wasm_backtrace_name_t>::with_capacity(table.len());
         for (idx, name) in table.drain(..) {
-            let (bytes, len, _cap) = name.into_raw_parts();
+            // FIXME Update this when vec_into_raw_parts is stabilized
+            let mut name = mem::ManuallyDrop::new(name);
             let name_t = ngx_wasm_backtrace_name_t {
                 idx,
                 name: Box::new(wasm_byte_vec_t {
-                    size: len,
-                    data: bytes,
+                    size: name.len(),
+                    data: name.as_mut_ptr(),
                 }),
             };
 
             names.push(name_t);
         }
 
-        let (bytes, len, _cap) = names.into_raw_parts();
+        // FIXME Update this when vec_into_raw_parts is stabilized
+        let mut names = mem::ManuallyDrop::new(names);
         Some(Box::new(ngx_wasm_backtrace_name_table_t {
-            size: len,
-            table: bytes,
+            size: names.len(),
+            table: names.as_mut_ptr(),
         }))
     } else {
         None
diff --git a/lib/ngx-wasm-rs/lib/backtrace/src/lib.rs b/lib/ngx-wasm-rs/lib/backtrace/src/lib.rs
index e692a8848..9cb0a85c9 100644
--- a/lib/ngx-wasm-rs/lib/backtrace/src/lib.rs
+++ b/lib/ngx-wasm-rs/lib/backtrace/src/lib.rs
@@ -1,3 +1,2 @@
-#![feature(vec_into_raw_parts)]
 pub(crate) mod backtrace;
 pub mod c_api;
diff --git a/lib/ngx-wasm-rs/lib/wat/src/lib.rs b/lib/ngx-wasm-rs/lib/wat/src/lib.rs
index 460f9e123..91cdec419 100644
--- a/lib/ngx-wasm-rs/lib/wat/src/lib.rs
+++ b/lib/ngx-wasm-rs/lib/wat/src/lib.rs
@@ -1,4 +1,3 @@
-#![feature(vec_into_raw_parts)]
 use ngx_wasm_c_api::*;
 use regex::Regex;
 use std::mem;
@@ -26,9 +25,10 @@ fn extract_message(err: &str) -> Option<String> {
 
 fn vec_into_wasm_byte_vec_t(bv: *mut wasm_byte_vec_t, v: Vec<u8>) -> () {
     unsafe {
-        let (ptr, len, _cap) = v.into_raw_parts();
-        (*bv).size = len;
-        (*bv).data = ptr;
+        // FIXME Update this when vec_into_raw_parts is stabilized
+        let mut v = mem::ManuallyDrop::new(v);
+        (*bv).size = v.len();
+        (*bv).data = v.as_mut_ptr();
     }
 }
 
diff --git a/rust-toolchain b/rust-toolchain
index bf867e0ae..2bf5ad044 100644
--- a/rust-toolchain
+++ b/rust-toolchain
@@ -1 +1 @@
-nightly
+stable
diff --git a/util/test.sh b/util/test.sh
index 8712672ff..e33e3c436 100755
--- a/util/test.sh
+++ b/util/test.sh
@@ -103,12 +103,11 @@ if [ "$TEST_NGINX_CARGO_PROFILE" = release ]; then
 fi
 
 export RUSTFLAGS="$TEST_NGINX_CARGO_RUSTFLAGS"
+export CARGO_TARGET_DIR="$DIR_TESTS_LIB_WASM"
 eval cargo build \
     --lib \
     "${args[@]}" \
     --target wasm32-wasi \
-    --out-dir $DIR_TESTS_LIB_WASM \
-    -Z unstable-options
 
 if [ $(uname -s) = Linux ]; then
     export TEST_NGINX_EVENT_TYPE=epoll