diff --git a/Cargo.toml b/Cargo.toml
index d9c3ec3..7f6ae1f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -20,7 +20,7 @@ itertools = "0.10.0"
 futures = "0.3.5"
 
 [dependencies.pyo3]
-version = "0.14.5"
+version = "0.15.1"
 features = ["extension-module"]
 
 [package.metadata.maturin]
diff --git a/build.rs b/build.rs
index a781ce1..dace4a9 100644
--- a/build.rs
+++ b/build.rs
@@ -1,3 +1,3 @@
 fn main() {
-  pyo3_build_config::add_extension_module_link_args();
+    pyo3_build_config::add_extension_module_link_args();
 }
diff --git a/src/document.rs b/src/document.rs
index df53773..5088f51 100644
--- a/src/document.rs
+++ b/src/document.rs
@@ -180,9 +180,9 @@ impl Document {
                 if key_value.len() != 2 {
                     continue;
                 }
-                let key: String = key_value.get_item(0).extract()?;
+                let key: String = key_value.get_item(0)?.extract()?;
                 let value_list =
-                    extract_value_single_or_list(key_value.get_item(1))?;
+                    extract_value_single_or_list(key_value.get_item(1)?)?;
                 field_values.insert(key, value_list);
             }
         }
@@ -199,9 +199,9 @@ impl Document {
                 if key_value.len() != 2 {
                     continue;
                 }
-                let key: String = key_value.get_item(0).extract()?;
+                let key: String = key_value.get_item(0)?.extract()?;
                 let value_list =
-                    extract_value_single_or_list(key_value.get_item(1))?;
+                    extract_value_single_or_list(key_value.get_item(1)?)?;
                 field_values.insert(key, value_list);
             }
         }