diff --git a/Cargo.lock b/Cargo.lock
index 43dc262..11de88f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -135,24 +135,10 @@ dependencies = [
 
 [[package]]
 name = "indoc"
-version = "0.3.6"
+version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "47741a8bc60fb26eb8d6e0238bbb26d8575ff623fdc97b1a2c00c050b9684ed8"
+checksum = "e7906a9fababaeacb774f72410e497a1d18de916322e33797bb2cd29baa23c9e"
 dependencies = [
- "indoc-impl",
- "proc-macro-hack",
-]
-
-[[package]]
-name = "indoc-impl"
-version = "0.3.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ce046d161f000fffde5f432a0d034d0341dc152643b2598ed5bfce44c4f3a8f0"
-dependencies = [
- "proc-macro-hack",
- "proc-macro2",
- "quote",
- "syn",
  "unindent",
 ]
 
@@ -167,24 +153,12 @@ dependencies = [
 
 [[package]]
 name = "inventory"
-version = "0.1.11"
+version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f0eb5160c60ba1e809707918ee329adb99d222888155835c6feedba19f6c3fd4"
+checksum = "ce6b5d8c669bfbad811d95ddd7a1c6cf9cfdbf2777e59928b6f3fa8ff54f72a0"
 dependencies = [
  "ctor",
  "ghost",
- "inventory-impl",
-]
-
-[[package]]
-name = "inventory-impl"
-version = "0.1.11"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7e41b53715c6f0c4be49510bb82dee2c1e51c8586d885abe65396e82ed518548"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn",
 ]
 
 [[package]]
@@ -292,25 +266,6 @@ dependencies = [
  "num-traits",
 ]
 
-[[package]]
-name = "paste"
-version = "0.1.18"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "45ca20c77d80be666aef2b45486da86238fabe33e38306bd3118fe4af33fa880"
-dependencies = [
- "paste-impl",
- "proc-macro-hack",
-]
-
-[[package]]
-name = "paste-impl"
-version = "0.1.18"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d95a7db200b97ef370c8e6de0088252f7e0dfff7d047a28528e47456c0fc98b6"
-dependencies = [
- "proc-macro-hack",
-]
-
 [[package]]
 name = "petgraph"
 version = "0.6.0"
@@ -384,12 +339,6 @@ version = "0.2.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "eb9f9e6e233e5c4a35559a617bf40a4ec447db2e84c20b55a6f83167b7e57872"
 
-[[package]]
-name = "proc-macro-hack"
-version = "0.5.19"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dbf0c48bc1d91375ae5c3cd81e3722dff1abcf81a30960240640d223f59fe0e5"
-
 [[package]]
 name = "proc-macro2"
 version = "1.0.37"
@@ -401,36 +350,48 @@ dependencies = [
 
 [[package]]
 name = "pyo3"
-version = "0.14.5"
+version = "0.16.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "35100f9347670a566a67aa623369293703322bb9db77d99d7df7313b575ae0c8"
+checksum = "6b3e99c4c3e790e4fc365b42b70c1f7801f42eadc4ea648fa327e6f5ca29f215"
 dependencies = [
  "cfg-if",
  "indoc",
  "inventory",
  "libc",
  "parking_lot",
- "paste",
  "pyo3-build-config",
+ "pyo3-ffi",
  "pyo3-macros",
  "unindent",
 ]
 
 [[package]]
 name = "pyo3-build-config"
-version = "0.14.5"
+version = "0.16.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d12961738cacbd7f91b7c43bc25cfeeaa2698ad07a04b3be0aa88b950865738f"
+checksum = "2486b96281859ff0a3929ba6467b13751627b974f7137362db38e2bed14b2094"
 dependencies = [
  "once_cell",
+ "target-lexicon",
+]
+
+[[package]]
+name = "pyo3-ffi"
+version = "0.16.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dd9de1d94557751599f8bd321f10e6c1ef2801067acb58c91138deef2ae83a17"
+dependencies = [
+ "libc",
+ "pyo3-build-config",
 ]
 
 [[package]]
 name = "pyo3-macros"
-version = "0.14.5"
+version = "0.16.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fc0bc5215d704824dfddddc03f93cb572e1155c68b6761c37005e1c288808ea8"
+checksum = "0b9584049129b1cfb615243391a6345c726690271ae195ffd6aa3766177296aa"
 dependencies = [
+ "proc-macro2",
  "pyo3-macros-backend",
  "quote",
  "syn",
@@ -438,12 +399,11 @@ dependencies = [
 
 [[package]]
 name = "pyo3-macros-backend"
-version = "0.14.5"
+version = "0.16.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "71623fc593224afaab918aa3afcaf86ed2f43d34f6afde7f3922608f253240df"
+checksum = "b6c4717e6a55c51a9958eda1f5481ff7f62cccd21f45309c10e4731cb7198dbc"
 dependencies = [
  "proc-macro2",
- "pyo3-build-config",
  "quote",
  "syn",
 ]
@@ -573,6 +533,12 @@ dependencies = [
  "unicode-xid",
 ]
 
+[[package]]
+name = "target-lexicon"
+version = "0.12.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d7fa7e55043acb85fca6b3c01485a2eeb6b69c5d21002e273c79e465f43b7ac1"
+
 [[package]]
 name = "termcolor"
 version = "1.1.3"
diff --git a/disasm-py/Cargo.toml b/disasm-py/Cargo.toml
index c05ce1a..1c4ae0f 100644
--- a/disasm-py/Cargo.toml
+++ b/disasm-py/Cargo.toml
@@ -16,5 +16,5 @@ extension-module = ["pyo3/extension-module"]
 default = ["extension-module"]
 
 [dependencies]
-pyo3 = { version = "0.14", features = ["multiple-pymethods"] }
+pyo3 = { version = "0.16", features = ["multiple-pymethods"] }
 ppc750cl = { version = "0.1.1", path = "../disasm" }
diff --git a/disasm-py/src/lib.rs b/disasm-py/src/lib.rs
index 6a2c9a5..0288041 100644
--- a/disasm-py/src/lib.rs
+++ b/disasm-py/src/lib.rs
@@ -1,6 +1,5 @@
 use pyo3::prelude::*;
 use pyo3::types::PyBytes;
-use pyo3::{PyIterProtocol, PyObjectProtocol};
 
 use ppc750cl::formatter::FormattedIns;
 
@@ -23,6 +22,10 @@ impl Ins {
     fn addr(&self) -> PyResult<u32> {
         Ok(self.0.addr)
     }
+
+    fn __str__(&self) -> String {
+        FormattedIns(self.0.clone()).to_string()
+    }
 }
 
 impl From<ppc750cl::Ins> for Ins {
@@ -31,13 +34,6 @@ impl From<ppc750cl::Ins> for Ins {
     }
 }
 
-#[pyproto]
-impl<'a> PyObjectProtocol<'a> for Ins {
-    fn __str__(&self) -> String {
-        FormattedIns(self.0.clone()).to_string()
-    }
-}
-
 #[pyclass]
 struct DisasmIterator {
     bytes: Py<PyBytes>,
@@ -46,8 +42,8 @@ struct DisasmIterator {
     left: usize,
 }
 
-#[pyproto]
-impl PyIterProtocol for DisasmIterator {
+#[pymethods]
+impl DisasmIterator {
     fn __iter__(slf: PyRef<Self>) -> PyRef<DisasmIterator> {
         slf
     }