diff --git a/script/Cargo.toml b/script/Cargo.toml
index c0e014ae..89e4af13 100644
--- a/script/Cargo.toml
+++ b/script/Cargo.toml
@@ -6,7 +6,7 @@ edition = "2018"
 
 [dependencies]
 thiserror = "1"
-rustpython-vm = { git = "https://github.com/RustPython/RustPython.git", rev = "397392c2fd5553a6d2f714e4fdba0df43f3ced52" }
+rustpython-vm = { git = "https://github.com/RustPython/RustPython.git", rev = "24800cbfcf71147392fd8579d21132780e5a9a7a", features = ["freeze-stdlib"] }
 serde = "1"
 serde_derive = "1"
 serde_json = "1"
diff --git a/script/src/error.rs b/script/src/error.rs
index 6cf42d13..8edef272 100644
--- a/script/src/error.rs
+++ b/script/src/error.rs
@@ -17,9 +17,8 @@ pub enum Error {
 
 impl Error {
     pub fn from_py(vm: &VirtualMachine, e: PyBaseExceptionRef) -> Self {
-        let mut buf = Vec::new();
-        let _ = write_exception(&mut buf, vm, &e);
-        let s = String::from_utf8_lossy(&buf).into_owned();
+        let mut s = String::new();
+        let _ = write_exception(&mut s, vm, &e);
         Error::Python(s)
     }
 }
diff --git a/script/src/gamedata.rs b/script/src/gamedata.rs
index 8c63f32d..b814d526 100644
--- a/script/src/gamedata.rs
+++ b/script/src/gamedata.rs
@@ -8,8 +8,8 @@ use std::cell::RefCell;
 use std::convert::TryInto;
 use std::sync::RwLock;
 use vm::builtins::PyInt;
-use vm::pyobject::{BorrowValue, IntoPyObject, PyObjectRef, PyResult};
 use vm::VirtualMachine;
+use vm::{IntoPyObject, PyObjectRef, PyResult};
 
 thread_local!(
     static GAME_DATA: UnsyncLazy<RefCell<Option<GameData>>> =
@@ -60,7 +60,7 @@ pub fn value_to_py(vm: &VirtualMachine, value: Value) -> PyObjectRef {
 
 pub fn py_to_value(vm: &VirtualMachine, pyvalue: PyObjectRef) -> PyResult<Value> {
     let value = if let Some(i) = pyvalue.payload::<PyInt>() {
-        let i: i64 = i.borrow_value().try_into().unwrap();
+        let i: i64 = i.as_bigint().try_into().unwrap();
         Value::Int(i)
     } else {
         return Err(vm.new_type_error(format!("invalid type value \"{}\" for set_gvar", pyvalue)));
diff --git a/script/src/rr.rs b/script/src/rr.rs
index be6ff8c0..8e523605 100644
--- a/script/src/rr.rs
+++ b/script/src/rr.rs
@@ -10,8 +10,7 @@ mod _rr {
     use rustpython_vm as vm;
     use std::convert::TryInto;
     use vm::builtins::{PyNone, PyStrRef};
-    use vm::pyobject::{PyObjectRef, PyResult, PyValue};
-    use vm::VirtualMachine;
+    use vm::{PyObjectRef, PyResult, PyValue, VirtualMachine};
 
     #[pyfunction]
     fn yield_result(vm: &VirtualMachine) -> Option<PyObjectRef> {