diff --git a/Cargo.toml b/Cargo.toml
index 2b03001..4775ad3 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,7 +13,8 @@ authors = [
 	"Daniel Xu <dxu@dxuuu.xyz>",
 ]
 license = "BSD-2-Clause"
-edition = "2018"
+edition = "2021"
+rust-version = "1.82" # first stable release to support "unsafe extern"
 build = "build.rs"
 links = "bpf"
 exclude = [
diff --git a/build.rs b/build.rs
index 75b35bf..e365d8a 100644
--- a/build.rs
+++ b/build.rs
@@ -58,6 +58,7 @@ fn generate_bindings(src_dir: path::PathBuf) {
         &path::PathBuf::from(env::var_os("OUT_DIR").expect("OUT_DIR should always be set"));
 
     bindgen::Builder::default()
+        .rust_target(env!("CARGO_PKG_RUST_VERSION").parse().expect("valid"))
         .derive_default(true)
         .explicit_padding(true)
         .default_enum_style(bindgen::EnumVariation::Consts)
diff --git a/rebuild.sh b/rebuild.sh
index 83421d8..d4218dc 100755
--- a/rebuild.sh
+++ b/rebuild.sh
@@ -5,7 +5,7 @@ DOCKER="docker"
 set -eu -o pipefail
 
 ${DOCKER} build --platform linux/amd64 -t libbpf-sys-builder - <<'EOF'
-FROM ubuntu:jammy AS libbpf-sys-builder
+FROM ubuntu:latest AS libbpf-sys-builder
 
 ENV LANG=C.UTF-8 \
     LC_ALL=C.UTF-8
@@ -26,7 +26,7 @@ RUN \
 
 ENTRYPOINT \
 	source $HOME/.cargo/env; \
-	cargo build --features bindgen-source --release --verbose;
+	cargo check --features bindgen-source --verbose;
 EOF
 
 ${DOCKER} run --platform linux/amd64 --rm -v "$(pwd):/usr/local/src/libbpf-sys" libbpf-sys-builder
diff --git a/src/bindings.rs b/src/bindings.rs
index d1c35e8..504e5ac 100644
--- a/src/bindings.rs
+++ b/src/bindings.rs
@@ -49,7 +49,11 @@ where
             index % 8
         };
         let mask = 1 << bit_index;
-        if val { byte | mask } else { byte & !mask }
+        if val {
+            byte | mask
+        } else {
+            byte & !mask
+        }
     }
     #[inline]
     pub fn set_bit(&mut self, index: usize, val: bool) {
@@ -7422,7 +7426,7 @@ unsafe extern "C" {
 }
 unsafe extern "C" {
     pub fn btf__add_ptr(btf: *mut btf, ref_type_id: ::std::os::raw::c_int)
-    -> ::std::os::raw::c_int;
+        -> ::std::os::raw::c_int;
 }
 unsafe extern "C" {
     pub fn btf__add_array(
@@ -8426,7 +8430,7 @@ unsafe extern "C" {
 }
 unsafe extern "C" {
     pub fn bpf_map__reuse_fd(map: *mut bpf_map, fd: ::std::os::raw::c_int)
-    -> ::std::os::raw::c_int;
+        -> ::std::os::raw::c_int;
 }
 unsafe extern "C" {
     pub fn bpf_map__name(map: *const bpf_map) -> *const ::std::os::raw::c_char;
@@ -8442,7 +8446,7 @@ unsafe extern "C" {
 }
 unsafe extern "C" {
     pub fn bpf_map__set_max_entries(map: *mut bpf_map, max_entries: __u32)
-    -> ::std::os::raw::c_int;
+        -> ::std::os::raw::c_int;
 }
 unsafe extern "C" {
     pub fn bpf_map__map_flags(map: *const bpf_map) -> __u32;
@@ -8681,7 +8685,7 @@ unsafe extern "C" {
 }
 unsafe extern "C" {
     pub fn bpf_tc_attach(hook: *const bpf_tc_hook, opts: *mut bpf_tc_opts)
-    -> ::std::os::raw::c_int;
+        -> ::std::os::raw::c_int;
 }
 unsafe extern "C" {
     pub fn bpf_tc_detach(
@@ -8890,7 +8894,7 @@ unsafe extern "C" {
 }
 unsafe extern "C" {
     pub fn perf_buffer__buffer_fd(pb: *const perf_buffer, buf_idx: size_t)
-    -> ::std::os::raw::c_int;
+        -> ::std::os::raw::c_int;
 }
 unsafe extern "C" {
     pub fn perf_buffer__buffer(