diff --git a/Cargo.lock b/Cargo.lock
index e10177f..055feb4 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -142,9 +142,9 @@ dependencies = [
 
 [[package]]
 name = "pyo3"
-version = "0.22.6"
+version = "0.23.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f402062616ab18202ae8319da13fa4279883a2b8a9d9f83f20dbade813ce1884"
+checksum = "e484fd2c8b4cb67ab05a318f1fd6fa8f199fcc30819f08f07d200809dba26c15"
 dependencies = [
  "cfg-if",
  "libc",
@@ -157,9 +157,9 @@ dependencies = [
 
 [[package]]
 name = "pyo3-build-config"
-version = "0.22.6"
+version = "0.23.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b14b5775b5ff446dd1056212d778012cbe8a0fbffd368029fd9e25b514479c38"
+checksum = "dc0e0469a84f208e20044b98965e1561028180219e35352a2afaf2b942beff3b"
 dependencies = [
  "once_cell",
  "target-lexicon",
@@ -167,9 +167,9 @@ dependencies = [
 
 [[package]]
 name = "pyo3-ffi"
-version = "0.22.6"
+version = "0.23.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9ab5bcf04a2cdcbb50c7d6105de943f543f9ed92af55818fd17b660390fc8636"
+checksum = "eb1547a7f9966f6f1a0f0227564a9945fe36b90da5a93b3933fc3dc03fae372d"
 dependencies = [
  "libc",
  "pyo3-build-config",
diff --git a/Cargo.toml b/Cargo.toml
index 3263e44..c4a9e09 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -44,7 +44,7 @@ chrono = { version = "0.4.38", default-features = false }
 half = { version = "2.4.1", default-features = false }
 itoa = { version = "1", default-features = false }
 once_cell = { version = "1", default-features = false, features = ["race"] }
-pyo3 = { version = "^0.22.6", default-features = false, features = ["extension-module"] }
+pyo3 = { version = "^0.23.3", default-features = false, features = ["extension-module"] }
 rmp = { version = "^0.8.14", default-features = false, features = ["std"] }
 serde = { version = "1", default-features = false }
 serde_bytes = { version = "0.11.15", default-features = false, features = ["std"] }
@@ -52,7 +52,7 @@ simdutf8 = { version = "0.1.5", default-features = false, features = ["std"] }
 smallvec = { version = "^1.13", default-features = false, features = ["union", "write"] }
 
 [build-dependencies]
-pyo3-build-config = { version = "^0.22.0" }
+pyo3-build-config = { version = "^0.23.3" }
 
 [profile.release]
 codegen-units = 1
diff --git a/src/lib.rs b/src/lib.rs
index 469dc43..2ee2994 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -53,7 +53,7 @@ pub unsafe extern "C" fn PyInit_ormsgpack() -> *mut PyModuleDef {
         PyMethodDef {
             ml_name: "packb\0".as_ptr() as *const c_char,
             ml_meth: PyMethodDefPointer {
-                _PyCFunctionFastWithKeywords: packb,
+                PyCFunctionFastWithKeywords: packb,
             },
             ml_flags: METH_FASTCALL | METH_KEYWORDS,
             ml_doc: PACKB_DOC.as_ptr() as *const c_char,
@@ -61,7 +61,7 @@ pub unsafe extern "C" fn PyInit_ormsgpack() -> *mut PyModuleDef {
         PyMethodDef {
             ml_name: "unpackb\0".as_ptr() as *const c_char,
             ml_meth: PyMethodDefPointer {
-                _PyCFunctionFastWithKeywords: unpackb,
+                PyCFunctionFastWithKeywords: unpackb,
             },
             ml_flags: METH_FASTCALL | METH_KEYWORDS,
             ml_doc: UNPACKB_DOC.as_ptr() as *const c_char,