diff --git a/src/rust/Cargo.toml b/src/rust/Cargo.toml
index 01fba147e..9dd060f8b 100644
--- a/src/rust/Cargo.toml
+++ b/src/rust/Cargo.toml
@@ -9,7 +9,7 @@ rust-version = "1.56.0"
 
 [dependencies]
 once_cell = "1"
-pyo3 = { version = "0.18", features = ["abi3-py37"] }
+pyo3 = { version = "0.19", features = ["abi3-py37"] }
 asn1 = { version = "0.15.2", default-features = false }
 cryptography-cffi = { path = "cryptography-cffi" }
 cryptography-x509 = { path = "cryptography-x509" }
diff --git a/src/rust/cryptography-cffi/Cargo.toml b/src/rust/cryptography-cffi/Cargo.toml
index 65051c2a4..24e53991b 100644
--- a/src/rust/cryptography-cffi/Cargo.toml
+++ b/src/rust/cryptography-cffi/Cargo.toml
@@ -8,7 +8,7 @@ publish = false
 rust-version = "1.56.0"
 
 [dependencies]
-pyo3 = { version = "0.18", features = ["abi3-py37"] }
+pyo3 = { version = "0.19", features = ["abi3-py37"] }
 openssl-sys = "0.9.88"
 
 [build-dependencies]
diff --git a/src/rust/src/x509/crl.rs b/src/rust/src/x509/crl.rs
index 923015035..1380d6eb8 100644
--- a/src/rust/src/x509/crl.rs
+++ b/src/rust/src/x509/crl.rs
@@ -145,7 +145,7 @@ impl CertificateRevocationList {
             revoked_certs
         });
 
-        if idx.is_instance_of::<pyo3::types::PySlice>()? {
+        if idx.is_instance_of::<pyo3::types::PySlice>() {
             let indices = idx
                 .downcast::<pyo3::types::PySlice>()?
                 .indices(self.len().try_into().unwrap())?;
diff --git a/src/rust/src/x509/extensions.rs b/src/rust/src/x509/extensions.rs
index 98d1bd63b..dcf28833f 100644
--- a/src/rust/src/x509/extensions.rs
+++ b/src/rust/src/x509/extensions.rs
@@ -211,7 +211,7 @@ fn encode_certificate_policies(
             let mut qualifiers = vec![];
             for py_qualifier in py_policy_qualifiers.iter()? {
                 let py_qualifier = py_qualifier?;
-                let qualifier = if py_qualifier.is_instance_of::<pyo3::types::PyString>()? {
+                let qualifier = if py_qualifier.is_instance_of::<pyo3::types::PyString>() {
                     let cps_uri = match asn1::IA5String::new(py_qualifier.extract()?) {
                         Some(s) => s,
                         None => {