diff --git a/Cargo.toml b/Cargo.toml
index 06385a2e..77afd18f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -22,14 +22,14 @@ dtoa = "1.0"
 itoa = "1.0"
 parking_lot = "0.12"
 prometheus-client-derive-encode = { version = "0.4.1", path = "derive-encode" }
-prost = { version = "0.11.0", optional = true }
-prost-types = { version = "0.11.0", optional = true }
+prost = { version = "0.12.0", optional = true }
+prost-types = { version = "0.12.0", optional = true }
 
 [dev-dependencies]
 async-std = { version = "1", features = ["attributes"] }
 criterion = "0.5"
 http-types = "2"
-pyo3 = "0.20"
+pyo3 = "0.21"
 quickcheck = "1"
 rand = "0.8.4"
 tide = "0.16"
@@ -40,7 +40,7 @@ hyper-util = { version = "0.1.3", features = ["tokio"] }
 http-body-util = "0.1.1"
 
 [build-dependencies]
-prost-build = { version = "0.11.0", optional = true }
+prost-build = { version = "0.12.0", optional = true }
 
 [[bench]]
 name = "baseline"
diff --git a/src/encoding/text.rs b/src/encoding/text.rs
index 4acf1d51..b14d2c2c 100644
--- a/src/encoding/text.rs
+++ b/src/encoding/text.rs
@@ -920,7 +920,7 @@ mod tests {
 
         println!("{:?}", input);
         Python::with_gil(|py| {
-            let parser = PyModule::from_code(
+            let parser = PyModule::from_code_bound(
                 py,
                 r#"
 from prometheus_client.openmetrics.parser import text_string_to_metric_families