diff --git a/crates/open_jtalk-sys/src/generated/android/aarch64/bindings.rs b/crates/open_jtalk-sys/src/generated/android/aarch64/bindings.rs
index 61bc5cc..f0993c0 100644
--- a/crates/open_jtalk-sys/src/generated/android/aarch64/bindings.rs
+++ b/crates/open_jtalk-sys/src/generated/android/aarch64/bindings.rs
@@ -1697,6 +1697,13 @@ extern "C" {
         dicdir: *const ::std::os::raw::c_char,
     ) -> ::std::os::raw::c_int;
 }
+extern "C" {
+    pub fn Mecab_load_with_userdic(
+        m: *mut Mecab,
+        dicdir: *const ::std::os::raw::c_char,
+        userdic: *const ::std::os::raw::c_char,
+    ) -> ::std::os::raw::c_int;
+}
 extern "C" {
     pub fn Mecab_analysis(
         m: *mut Mecab,
diff --git a/crates/open_jtalk-sys/src/generated/android/x86_64/bindings.rs b/crates/open_jtalk-sys/src/generated/android/x86_64/bindings.rs
index 61bc5cc..f0993c0 100644
--- a/crates/open_jtalk-sys/src/generated/android/x86_64/bindings.rs
+++ b/crates/open_jtalk-sys/src/generated/android/x86_64/bindings.rs
@@ -1697,6 +1697,13 @@ extern "C" {
         dicdir: *const ::std::os::raw::c_char,
     ) -> ::std::os::raw::c_int;
 }
+extern "C" {
+    pub fn Mecab_load_with_userdic(
+        m: *mut Mecab,
+        dicdir: *const ::std::os::raw::c_char,
+        userdic: *const ::std::os::raw::c_char,
+    ) -> ::std::os::raw::c_int;
+}
 extern "C" {
     pub fn Mecab_analysis(
         m: *mut Mecab,
diff --git a/crates/open_jtalk-sys/src/generated/ios/aarch64/bindings.rs b/crates/open_jtalk-sys/src/generated/ios/aarch64/bindings.rs
index b937f38..3a570c4 100644
--- a/crates/open_jtalk-sys/src/generated/ios/aarch64/bindings.rs
+++ b/crates/open_jtalk-sys/src/generated/ios/aarch64/bindings.rs
@@ -2151,6 +2151,13 @@ extern "C" {
         dicdir: *const ::std::os::raw::c_char,
     ) -> ::std::os::raw::c_int;
 }
+extern "C" {
+    pub fn Mecab_load_with_userdic(
+        m: *mut Mecab,
+        dicdir: *const ::std::os::raw::c_char,
+        userdic: *const ::std::os::raw::c_char,
+    ) -> ::std::os::raw::c_int;
+}
 extern "C" {
     pub fn Mecab_analysis(
         m: *mut Mecab,
diff --git a/crates/open_jtalk-sys/src/generated/ios/x86_64/bindings.rs b/crates/open_jtalk-sys/src/generated/ios/x86_64/bindings.rs
index b937f38..3a570c4 100644
--- a/crates/open_jtalk-sys/src/generated/ios/x86_64/bindings.rs
+++ b/crates/open_jtalk-sys/src/generated/ios/x86_64/bindings.rs
@@ -2151,6 +2151,13 @@ extern "C" {
         dicdir: *const ::std::os::raw::c_char,
     ) -> ::std::os::raw::c_int;
 }
+extern "C" {
+    pub fn Mecab_load_with_userdic(
+        m: *mut Mecab,
+        dicdir: *const ::std::os::raw::c_char,
+        userdic: *const ::std::os::raw::c_char,
+    ) -> ::std::os::raw::c_int;
+}
 extern "C" {
     pub fn Mecab_analysis(
         m: *mut Mecab,
diff --git a/crates/open_jtalk-sys/src/generated/linux/aarch64/bindings.rs b/crates/open_jtalk-sys/src/generated/linux/aarch64/bindings.rs
index b297198..c90e99e 100644
--- a/crates/open_jtalk-sys/src/generated/linux/aarch64/bindings.rs
+++ b/crates/open_jtalk-sys/src/generated/linux/aarch64/bindings.rs
@@ -2249,6 +2249,13 @@ extern "C" {
         dicdir: *const ::std::os::raw::c_char,
     ) -> ::std::os::raw::c_int;
 }
+extern "C" {
+    pub fn Mecab_load_with_userdic(
+        m: *mut Mecab,
+        dicdir: *const ::std::os::raw::c_char,
+        userdic: *const ::std::os::raw::c_char,
+    ) -> ::std::os::raw::c_int;
+}
 extern "C" {
     pub fn Mecab_analysis(
         m: *mut Mecab,
diff --git a/crates/open_jtalk-sys/src/generated/linux/x86_64/bindings.rs b/crates/open_jtalk-sys/src/generated/linux/x86_64/bindings.rs
index b297198..c90e99e 100644
--- a/crates/open_jtalk-sys/src/generated/linux/x86_64/bindings.rs
+++ b/crates/open_jtalk-sys/src/generated/linux/x86_64/bindings.rs
@@ -2249,6 +2249,13 @@ extern "C" {
         dicdir: *const ::std::os::raw::c_char,
     ) -> ::std::os::raw::c_int;
 }
+extern "C" {
+    pub fn Mecab_load_with_userdic(
+        m: *mut Mecab,
+        dicdir: *const ::std::os::raw::c_char,
+        userdic: *const ::std::os::raw::c_char,
+    ) -> ::std::os::raw::c_int;
+}
 extern "C" {
     pub fn Mecab_analysis(
         m: *mut Mecab,
diff --git a/crates/open_jtalk-sys/src/generated/macos/aarch64/bindings.rs b/crates/open_jtalk-sys/src/generated/macos/aarch64/bindings.rs
index b937f38..3a570c4 100644
--- a/crates/open_jtalk-sys/src/generated/macos/aarch64/bindings.rs
+++ b/crates/open_jtalk-sys/src/generated/macos/aarch64/bindings.rs
@@ -2151,6 +2151,13 @@ extern "C" {
         dicdir: *const ::std::os::raw::c_char,
     ) -> ::std::os::raw::c_int;
 }
+extern "C" {
+    pub fn Mecab_load_with_userdic(
+        m: *mut Mecab,
+        dicdir: *const ::std::os::raw::c_char,
+        userdic: *const ::std::os::raw::c_char,
+    ) -> ::std::os::raw::c_int;
+}
 extern "C" {
     pub fn Mecab_analysis(
         m: *mut Mecab,
diff --git a/crates/open_jtalk-sys/src/generated/macos/x86_64/bindings.rs b/crates/open_jtalk-sys/src/generated/macos/x86_64/bindings.rs
index b937f38..3a570c4 100644
--- a/crates/open_jtalk-sys/src/generated/macos/x86_64/bindings.rs
+++ b/crates/open_jtalk-sys/src/generated/macos/x86_64/bindings.rs
@@ -2151,6 +2151,13 @@ extern "C" {
         dicdir: *const ::std::os::raw::c_char,
     ) -> ::std::os::raw::c_int;
 }
+extern "C" {
+    pub fn Mecab_load_with_userdic(
+        m: *mut Mecab,
+        dicdir: *const ::std::os::raw::c_char,
+        userdic: *const ::std::os::raw::c_char,
+    ) -> ::std::os::raw::c_int;
+}
 extern "C" {
     pub fn Mecab_analysis(
         m: *mut Mecab,
diff --git a/crates/open_jtalk-sys/src/generated/windows/x86/bindings.rs b/crates/open_jtalk-sys/src/generated/windows/x86/bindings.rs
index 478c077..fb07d2d 100644
--- a/crates/open_jtalk-sys/src/generated/windows/x86/bindings.rs
+++ b/crates/open_jtalk-sys/src/generated/windows/x86/bindings.rs
@@ -1725,6 +1725,13 @@ extern "C" {
         dicdir: *const ::std::os::raw::c_char,
     ) -> ::std::os::raw::c_int;
 }
+extern "C" {
+    pub fn Mecab_load_with_userdic(
+        m: *mut Mecab,
+        dicdir: *const ::std::os::raw::c_char,
+        userdic: *const ::std::os::raw::c_char,
+    ) -> ::std::os::raw::c_int;
+}
 extern "C" {
     pub fn Mecab_analysis(
         m: *mut Mecab,
diff --git a/crates/open_jtalk-sys/src/generated/windows/x86_64/bindings.rs b/crates/open_jtalk-sys/src/generated/windows/x86_64/bindings.rs
index 98d0c85..eaa2c38 100644
--- a/crates/open_jtalk-sys/src/generated/windows/x86_64/bindings.rs
+++ b/crates/open_jtalk-sys/src/generated/windows/x86_64/bindings.rs
@@ -1725,6 +1725,13 @@ extern "C" {
         dicdir: *const ::std::os::raw::c_char,
     ) -> ::std::os::raw::c_int;
 }
+extern "C" {
+    pub fn Mecab_load_with_userdic(
+        m: *mut Mecab,
+        dicdir: *const ::std::os::raw::c_char,
+        userdic: *const ::std::os::raw::c_char,
+    ) -> ::std::os::raw::c_int;
+}
 extern "C" {
     pub fn Mecab_analysis(
         m: *mut Mecab,
diff --git a/crates/open_jtalk/src/mecab/mod.rs b/crates/open_jtalk/src/mecab/mod.rs
index 2c45830..8847d91 100644
--- a/crates/open_jtalk/src/mecab/mod.rs
+++ b/crates/open_jtalk/src/mecab/mod.rs
@@ -47,6 +47,27 @@ impl Mecab {
             ))
         }
     }
+
+    /// # Panics
+    ///
+    /// 次の場合にパニックする。
+    ///
+    /// - `dic_dir`または`userdic`が`\0`を含む。
+    /// - `dic_dir`または`userdic`がUTF-8の文字列ではない。
+    pub fn load_with_userdic(&mut self, dic_dir: &Path, userdic: Option<&Path>) -> bool {
+        let dic_dir = CString::new(dic_dir.to_str().unwrap()).unwrap();
+        let userdic = &userdic.map(|userdic| CString::new(userdic.to_str().unwrap()).unwrap());
+        unsafe {
+            bool_number_to_bool(open_jtalk_sys::Mecab_load_with_userdic(
+                self.as_raw_ptr(),
+                dic_dir.as_ptr(),
+                match userdic {
+                    Some(userdic) => userdic.as_ptr(),
+                    None => std::ptr::null(),
+                },
+            ))
+        }
+    }
     pub fn get_feature(&self) -> Option<&MecabFeature> {
         unsafe {
             let feature = open_jtalk_sys::Mecab_get_feature(self.as_raw_ptr());