diff --git a/Cargo.toml b/Cargo.toml
index a0b686b..7bc38b7 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -15,5 +15,5 @@ tantivy = { git = "https://github.com/tantivy-search/tantivy", branch = "master"
 itertools = "0.8"
 
 [dependencies.pyo3]
-version = "0.7.0"
+version = "0.8"
 features = ["extension-module"]
diff --git a/rust-toolchain b/rust-toolchain
index f677ace..756a627 100644
--- a/rust-toolchain
+++ b/rust-toolchain
@@ -1 +1 @@
-nightly-2019-05-22
+nightly-2019-09-24
diff --git a/src/document.rs b/src/document.rs
index cffe861..58a58ea 100644
--- a/src/document.rs
+++ b/src/document.rs
@@ -20,10 +20,10 @@ use tantivy::schema::Value;
 
 fn value_to_py(py: Python, value: &Value) -> PyResult<PyObject> {
     Ok(match value {
-        Value::Str(text) => text.into_object(py),
-        Value::U64(num) => num.into_object(py),
-        Value::I64(num) => num.into_object(py),
-        Value::F64(num) => num.into_object(py),
+        Value::Str(text) => text.into_py(py),
+        Value::U64(num) => (*num).into_py(py),
+        Value::I64(num) => (*num).into_py(py),
+        Value::F64(num) => (*num).into_py(py),
         Value::Bytes(b) => b.to_object(py),
         Value::Date(d) => PyDateTime::new(
             py,
@@ -36,8 +36,8 @@ fn value_to_py(py: Python, value: &Value) -> PyResult<PyObject> {
             d.timestamp_subsec_micros(),
             None,
         )?
-        .into_object(py),
-        Value::Facet(f) => Facet { inner: f.clone() }.into_object(py),
+        .into_py(py),
+        Value::Facet(f) => Facet { inner: f.clone() }.into_py(py),
     })
 }