diff --git a/.ruby-version b/.ruby-version
index fb3198ba..2f9dd5fd 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-ruby-4.0.0-preview2
+ruby-4.0.0
diff --git a/crates/rb-sys-build/src/bindings.rs b/crates/rb-sys-build/src/bindings.rs
index 4d0dbc01..7b727338 100644
--- a/crates/rb-sys-build/src/bindings.rs
+++ b/crates/rb-sys-build/src/bindings.rs
@@ -141,19 +141,11 @@ fn clean_docs(rbconfig: &RbConfig, syntax: &mut syn::File) {
 }
 
 fn default_bindgen(clang_args: Vec<String>, rbconfig: &RbConfig) -> bindgen::Builder {
-    // Disable layout tests and Debug impl for Ruby 2.7 and 3.0 on Windows MinGW due to type incompatibilities
-    let is_old_ruby_windows_mingw = if cfg!(target_os = "windows") && !is_msvc() {
-        if let Some((major, minor)) = rbconfig.major_minor() {
-            (major == 2 && minor == 7) || (major == 3 && minor == 0)
-        } else {
-            false
-        }
-    } else {
-        false
-    };
+    // Disable layout tests and Debug impl on Windows MinGW due to packed struct layout incompatibilities
+    let is_windows_mingw = cfg!(target_os = "windows") && !is_msvc();
 
-    let enable_layout_tests = !is_old_ruby_windows_mingw && cfg!(feature = "bindgen-layout-tests");
-    let impl_debug = !is_old_ruby_windows_mingw && cfg!(feature = "bindgen-impl-debug");
+    let enable_layout_tests = !is_windows_mingw && cfg!(feature = "bindgen-layout-tests");
+    let impl_debug = !is_windows_mingw && cfg!(feature = "bindgen-impl-debug");
 
     let mut bindings = bindgen::Builder::default()
         .rustified_enum(".*")
@@ -167,6 +159,8 @@ fn default_bindgen(clang_args: Vec<String>, rbconfig: &RbConfig) -> bindgen::Bui
         .blocklist_item("^__pthread_.*")
         .blocklist_item("^pthread_.*")
         .blocklist_item("^rb_native.*")
+        .blocklist_type("INET_PORT_RESERVATION_INSTANCE")
+        .blocklist_type("PINET_PORT_RESERVATION_INSTANCE")
         .opaque_type("^__sFILE$")
         .merge_extern_blocks(true)
         .generate_comments(true)
diff --git a/flake.lock b/flake.lock
index c42e6e2d..db924c54 100644
--- a/flake.lock
+++ b/flake.lock
@@ -54,11 +54,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1753939845,
-        "narHash": "sha256-K2ViRJfdVGE8tpJejs8Qpvvejks1+A4GQej/lBk5y7I=",
+        "lastModified": 1767379071,
+        "narHash": "sha256-EgE0pxsrW9jp9YFMkHL9JMXxcqi/OoumPJYwf+Okucw=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "94def634a20494ee057c76998843c015909d6311",
+        "rev": "fb7944c166a3b630f177938e478f0378e64ce108",
         "type": "github"
       },
       "original": {
@@ -77,11 +77,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1765587275,
-        "narHash": "sha256-vmT73WDxHIoVhMIO6KyxkAUsN3YQLZfnpLU/T79NUUw=",
+        "lastModified": 1766728475,
+        "narHash": "sha256-9y9WBiQONK9TgD4lu8SW6TpcfEaJTxEs1HjhC4s4vnY=",
         "owner": "bobvanderlinden",
         "repo": "nixpkgs-ruby",
-        "rev": "6ae67be3862a2442cce588bea8e5f7ae88b54870",
+        "rev": "f167828eab19c3a7e3faa066a140d92e307f7b16",
         "type": "github"
       },
       "original": {
@@ -119,11 +119,11 @@
         "nixpkgs": "nixpkgs_2"
       },
       "locked": {
-        "lastModified": 1754016903,
-        "narHash": "sha256-mRB5OOx7H5kFwW8Qtc/7dO3qHsBQtZ/eYQEj93/Noo8=",
+        "lastModified": 1767581716,
+        "narHash": "sha256-FUbiUzdrGkLou37OGfb4vCLPnqdSIvtmJBxjh2iljiE=",
         "owner": "oxalica",
         "repo": "rust-overlay",
-        "rev": "ddd488184f01603b712ddbb6dc9fe0b8447eb7fc",
+        "rev": "1d3f83babdd21e16bf5cfe0f1efcb4f49ee1bc2c",
         "type": "github"
       },
       "original": {