@@ -139,8 +139,8 @@ pkcs8 = { version = "0.10", features = ["encryption", "pkcs5", "pem"], optional
 
 [target.'cfg(not(any(target_os = "android", target_arch = "wasm32")))'.dependencies]
 libsqlite3-sys = { version = "0.36", features = ["bundled"], optional = true }
-lzma-sys = "0.1"
-xz2 = "0.1"
+liblzma-sys = "0.4"
+liblzma = "0.4"
 
 [target.'cfg(windows)'.dependencies]
 paste = { workspace = true }
 
@@ -9,47 +9,45 @@ mod _lzma {
         DecompressError, DecompressState, DecompressStatus, Decompressor,
     };
     use alloc::fmt;
+    use liblzma::stream::{Action, Check, Error, Filters, LzmaOptions, Status, Stream};
     #[pyattr]
-    use lzma_sys::{
+    use liblzma_sys::{
         LZMA_CHECK_CRC32 as CHECK_CRC32, LZMA_CHECK_CRC64 as CHECK_CRC64,
         LZMA_CHECK_NONE as CHECK_NONE, LZMA_CHECK_SHA256 as CHECK_SHA256,
     };
     #[pyattr]
-    use lzma_sys::{
+    use liblzma_sys::{
         LZMA_FILTER_ARM as FILTER_ARM, LZMA_FILTER_ARMTHUMB as FILTER_ARMTHUMB,
         LZMA_FILTER_IA64 as FILTER_IA64, LZMA_FILTER_LZMA1 as FILTER_LZMA1,
         LZMA_FILTER_LZMA2 as FILTER_LZMA2, LZMA_FILTER_POWERPC as FILTER_POWERPC,
         LZMA_FILTER_SPARC as FILTER_SPARC, LZMA_FILTER_X86 as FILTER_X86,
     };
     #[pyattr]
-    use lzma_sys::{
+    use liblzma_sys::{
         LZMA_MF_BT2 as MF_BT2, LZMA_MF_BT3 as MF_BT3, LZMA_MF_BT4 as MF_BT4, LZMA_MF_HC3 as MF_HC3,
         LZMA_MF_HC4 as MF_HC4,
     };
     #[pyattr]
-    use lzma_sys::{LZMA_MODE_FAST as MODE_FAST, LZMA_MODE_NORMAL as MODE_NORMAL};
+    use liblzma_sys::{LZMA_MODE_FAST as MODE_FAST, LZMA_MODE_NORMAL as MODE_NORMAL};
     #[pyattr]
-    use lzma_sys::{
+    use liblzma_sys::{
         LZMA_PRESET_DEFAULT as PRESET_DEFAULT, LZMA_PRESET_EXTREME as PRESET_EXTREME,
-        LZMA_PRESET_LEVEL_MASK as PRESET_LEVEL_MASK,
     };
     use rustpython_common::lock::PyMutex;
     use rustpython_vm::builtins::{PyBaseExceptionRef, PyBytesRef, PyType, PyTypeRef};
     use rustpython_vm::convert::ToPyException;
     use rustpython_vm::function::ArgBytesLike;
     use rustpython_vm::types::Constructor;
     use rustpython_vm::{Py, PyObjectRef, PyPayload, PyResult, VirtualMachine};
-    use xz2::stream::{Action, Check, Error, Filters, LzmaOptions, Status, Stream};
 
     #[cfg(windows)]
     type EnumVal = i32;
     #[cfg(not(windows))]
     type EnumVal = u32;
 
     const BUFSIZ: usize = 8192;
-    // TODO: can't find this in lzma-sys, but find way not to hardcode this
     #[pyattr]
-    const FILTER_DELTA: i32 = 3;
+    const FILTER_DELTA: u64 = liblzma_sys::LZMA_FILTER_DELTA;
     #[pyattr]
     const CHECK_ID_MAX: i32 = 15;
     #[pyattr]
@@ -87,7 +85,7 @@ mod _lzma {
 
     #[pyfunction]
     fn is_check_supported(check: i32) -> bool {
-        unsafe { lzma_sys::lzma_check_is_supported(check as _) != 0 }
+        unsafe { liblzma_sys::lzma_check_is_supported(check as _) != 0 }
     }
 
     // TODO: To implement these we need a function to convert a pyobject to a lzma filter and related structs