diff --git a/.github/workflows/release.yaml b/.github/workflows/release.yaml
index 9ac6909..24a009a 100644
--- a/.github/workflows/release.yaml
+++ b/.github/workflows/release.yaml
@@ -9,6 +9,8 @@ concurrency:
   cancel-in-progress: ${{ github.ref != 'refs/heads/main' }}
 jobs:
   release:
+    permissions:
+      id-token: write
     runs-on: ubuntu-latest
     environment: ${{ github.ref == 'refs/heads/main' && 'release' || '' }}
     steps:
@@ -17,7 +19,9 @@ jobs:
           submodules: true
       - uses: raviqqe/cargo-cache@v1
       - run: cargo install cargo-workspaces
-      - run: cargo workspaces publish -y --from-git --no-verify
-        env:
-          CARGO_REGISTRY_TOKEN: ${{ secrets.CARGO_REGISTRY_TOKEN }}
+      - uses: rust-lang/crates-io-auth-action@v1
+        id: auth
         if: github.ref == 'refs/heads/main'
+      - run: cargo workspaces publish -y --from-git ${{ github.ref != 'refs/heads/main' && '--dry-run' || '' }}
+        env:
+          CARGO_REGISTRY_TOKEN: ${{ steps.auth.outputs.token }}
diff --git a/Cargo.lock b/Cargo.lock
index 09a55ab..b819de3 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -13,7 +13,7 @@ dependencies = [
 
 [[package]]
 name = "bdwgc-alloc"
-version = "0.6.10"
+version = "0.6.11"
 dependencies = [
  "autotools",
  "cmake",
diff --git a/Cargo.toml b/Cargo.toml
index f699ae6..2883d7d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,21 +1,17 @@
 [package]
 name = "bdwgc-alloc"
+version = "0.6.11"
+edition = "2024"
 description = "impl GlobalAlloc for bdwgc"
-version = "0.6.10"
-authors = [
-  "swgillespie <sean.william.g@gmail.com>",
-  "Yota Toyama <raviqqe@gmail.com>",
-]
 repository = "https://github.com/raviqqe/bdwgc-alloc"
-edition = "2021"
 license = "MIT"
 
-[features]
-default = ["autotools"]
-
 [dependencies]
 libc = "0.2"
 
 [build-dependencies]
 autotools = { version = "0.2", optional = true }
 cmake = { version = "0.1", optional = true }
+
+[features]
+default = ["autotools"]
diff --git a/src/lib.rs b/src/lib.rs
index f84c7cc..2733ef5 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -17,7 +17,7 @@ struct GcStackBase {
 }
 
 #[link(name = "gc", kind = "static")]
-extern "C" {
+unsafe extern "C" {
     fn GC_allow_register_threads();
     fn GC_alloc_lock();
     fn GC_alloc_unlock();
@@ -58,8 +58,10 @@ impl Allocator {
     ///
     /// This function must be called in a main thread.
     pub unsafe fn initialize() {
-        GC_init();
-        GC_allow_register_threads();
+        unsafe {
+            GC_init();
+            GC_allow_register_threads();
+        }
     }
 
     /// Registers a current thread to a collector.
@@ -70,9 +72,9 @@ impl Allocator {
     pub unsafe fn register_current_thread() -> Result<(), error::Error> {
         let mut base = GcStackBase { mem_base: null() };
 
-        if GC_get_stack_base(&mut base) != GC_SUCCESS {
+        if unsafe { GC_get_stack_base(&mut base) } != GC_SUCCESS {
             return Err(error::Error::new("failed to get stack base"));
-        } else if GC_register_my_thread(&base) != GC_SUCCESS {
+        } else if unsafe { GC_register_my_thread(&base) } != GC_SUCCESS {
             return Err(error::Error::new("failed to register a thread for GC"));
         }
 
@@ -88,12 +90,14 @@ impl Allocator {
     ///
     /// The bottom address must be valid.
     pub unsafe fn set_stack_bottom(bottom: *const u8) {
-        GC_set_stackbottom(
-            null(),
-            &GcStackBase {
-                mem_base: bottom as *const libc::c_void,
-            },
-        )
+        unsafe {
+            GC_set_stackbottom(
+                null(),
+                &GcStackBase {
+                    mem_base: bottom as *const libc::c_void,
+                },
+            )
+        }
     }
 
     /// Unregisters a current thread from a collector.
@@ -102,7 +106,7 @@ impl Allocator {
     ///
     /// The thread must be registered already.
     pub unsafe fn unregister_current_thread() {
-        GC_unregister_my_thread()
+        unsafe { GC_unregister_my_thread() }
     }
 
     /// Runs a garbage collection forcibly.
@@ -120,20 +124,20 @@ impl Allocator {
         finalizer: extern "C" fn(*mut c_void, *mut c_void),
         client_data: *const c_void,
     ) {
-        GC_register_finalizer(ptr, finalizer, client_data, null(), null());
+        unsafe { GC_register_finalizer(ptr, finalizer, client_data, null(), null()) };
     }
 }
 
 unsafe impl GlobalAlloc for Allocator {
     unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
-        GC_malloc(layout.size()) as *mut u8
+        (unsafe { GC_malloc(layout.size()) }) as *mut u8
     }
 
     unsafe fn dealloc(&self, ptr: *mut u8, _layout: Layout) {
-        GC_free(ptr as *mut c_void)
+        unsafe { GC_free(ptr as *mut c_void) }
     }
 
     unsafe fn realloc(&self, ptr: *mut u8, _layout: Layout, size: usize) -> *mut u8 {
-        GC_realloc(ptr as *mut c_void, size) as *mut u8
+        (unsafe { GC_realloc(ptr as *mut c_void, size) }) as *mut u8
     }
 }