diff --git a/.github/workflows/maturin_upload_pypi.yml b/.github/workflows/maturin_upload_pypi.yml
index 934c2ee..b322394 100644
--- a/.github/workflows/maturin_upload_pypi.yml
+++ b/.github/workflows/maturin_upload_pypi.yml
@@ -1,4 +1,4 @@
-# This file is autogenerated by maturin v1.2.3
+# This file is autogenerated by maturin v1.9.6
 # To update, run
 #
 #    maturin generate-ci github
@@ -15,96 +15,167 @@ permissions:
 
 jobs:
   linux:
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.platform.runner }}
     strategy:
       matrix:
-        target: [x86_64, x86, aarch64, armv7, s390x, ppc64le]
-      fail-fast: false
+        platform:
+          - runner: ubuntu-22.04
+            target: x86_64
+          - runner: ubuntu-22.04
+            target: x86
+          - runner: ubuntu-22.04
+            target: aarch64
+          - runner: ubuntu-22.04
+            target: armv7
+          - runner: ubuntu-22.04
+            target: s390x
+          - runner: ubuntu-22.04
+            target: ppc64le
     steps:
-      - uses: actions/checkout@v5
-      - uses: actions/setup-python@v5
+      - uses: actions/checkout@main
+      - uses: actions/setup-python@v6
         with:
-          python-version: '3.9 - 3.13'
+          python-version: |
+            3.8 - 3.14
+            3.x
+            pypy3.8
+            pypy3.9
+            pypy3.10
+            pypy3.11
       - name: Build wheels
         uses: PyO3/maturin-action@v1
         env:
           PYO3_USE_ABI3_FORWARD_COMPATIBILITY: 1
         with:
-          target: ${{ matrix.target }}
+          target: ${{ matrix.platform.target }}
           args: --release --out ../dist --find-interpreter
-          sccache: 'true'
+          sccache: ${{ !startsWith(github.ref, 'refs/tags/') }}
           manylinux: auto
           working-directory: lib/
       - name: Upload wheels
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@main
         with:
-          name: wheels-linux-${{ matrix.target }}
+          name: wheels-linux-${{ matrix.platform.target }}
+          path: dist
+          if-no-files-found: error
+
+  musllinux:
+    runs-on: ${{ matrix.platform.runner }}
+    strategy:
+      matrix:
+        platform:
+          - runner: ubuntu-22.04
+            target: x86_64
+          - runner: ubuntu-22.04
+            target: x86
+          - runner: ubuntu-22.04
+            target: aarch64
+          - runner: ubuntu-22.04
+            target: armv7
+    steps:
+      - uses: actions/checkout@main
+      - uses: actions/setup-python@v6
+        with:
+          python-version: |
+            3.8 - 3.14
+            3.x
+            pypy3.8
+            pypy3.9
+            pypy3.10
+            pypy3.11
+      - name: Build wheels
+        uses: PyO3/maturin-action@v1
+        env:
+          PYO3_USE_ABI3_FORWARD_COMPATIBILITY: 1
+        with:
+          target: ${{ matrix.platform.target }}
+          args: --release --out ../dist --find-interpreter
+          sccache: ${{ !startsWith(github.ref, 'refs/tags/') }}
+          manylinux: musllinux_1_2
+          working-directory: lib/
+      - name: Upload wheels
+        uses: actions/upload-artifact@main
+        with:
+          name: wheels-musllinux-${{ matrix.platform.target }}
           path: dist
           if-no-files-found: error
 
   windows:
-    runs-on: windows-latest
+    runs-on: ${{ matrix.platform.runner }}
     strategy:
       matrix:
-        target: [x64, x86]
-      fail-fast: false
+        platform:
+          - runner: windows-latest
+            target: x64
+          - runner: windows-latest
+            target: x86
     steps:
-      - uses: actions/checkout@v5
-      - uses: actions/setup-python@v5
+      - uses: actions/checkout@main
+      - uses: actions/setup-python@v6
         with:
-          python-version: '3.13'
-          architecture: ${{ matrix.target }}
+          # We can't use pypy3.8 nor pypy3.11 in CI
+          python-version: |
+            3.8 - 3.14
+            3.x
+            pypy3.9
+            pypy3.10
+          architecture: ${{ matrix.platform.target }}
       - name: Build wheels
         uses: PyO3/maturin-action@v1
         env:
           PYO3_USE_ABI3_FORWARD_COMPATIBILITY: 1
         with:
-          target: ${{ matrix.target }}
+          target: ${{ matrix.platform.target }}
           args: --release --out ../dist --find-interpreter
-          sccache: 'true'
+          sccache: ${{ !startsWith(github.ref, 'refs/tags/') }}
           working-directory: lib/
       - name: Upload wheels
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@main
         with:
-          name: wheels-windows-${{ matrix.target }}
+          name: wheels-windows-${{ matrix.platform.target }}
           path: dist
           if-no-files-found: error
 
   macos:
-    runs-on: macos-latest
+    runs-on: ${{ matrix.platform.runner }}
     strategy:
       matrix:
-        target: [x86_64, aarch64]
-      fail-fast: false
+        platform:
+          - runner: macos-13
+            target: x86_64
+          - runner: macos-14
+            target: aarch64
     steps:
-      - uses: actions/checkout@v5
-      - uses: actions/setup-python@v5
+      - uses: actions/checkout@main
+      - uses: actions/setup-python@v6
         with:
-          python-version: '3.13'
+          # We can't use pypy3.8 in CI
+          python-version: |
+            3.8 - 3.14
+            3.x
+            pypy3.9
+            pypy3.10
+            pypy3.11
       - name: Build wheels
         uses: PyO3/maturin-action@v1
         env:
           PYO3_USE_ABI3_FORWARD_COMPATIBILITY: 1
         with:
-          target: ${{ matrix.target }}
+          target: ${{ matrix.platform.target }}
           args: --release --out ../dist --find-interpreter
-          sccache: 'true'
+          sccache: ${{ !startsWith(github.ref, 'refs/tags/') }}
           working-directory: lib/
       - name: Upload wheels
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@main
         with:
-          name: wheels-macos-${{ matrix.target }}
+          name: wheels-macos-${{ matrix.platform.target }}
           path: dist
           if-no-files-found: error
 
   sdist:
     runs-on: ubuntu-latest
-    strategy:
-      fail-fast: false
     steps:
-      - name: Checkout repo
-        uses: actions/checkout@v5
-
+      - uses: actions/checkout@main
       - name: Build sdist
         uses: PyO3/maturin-action@v1
         env:
@@ -113,11 +184,10 @@ jobs:
           command: sdist
           args: --out ../dist
           working-directory: lib/
-
       - name: Upload sdist
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@main
         with:
-          name: sdist
+          name: wheels-sdist
           path: dist
           if-no-files-found: error
 
@@ -127,7 +197,7 @@ jobs:
 
     steps:
       - name: Checkout reposistory
-        uses: actions/checkout@v5
+        uses: actions/checkout@main
 
       - name: Setup Rust toolchain
         uses: dtolnay/rust-toolchain@stable
@@ -143,24 +213,27 @@ jobs:
   release:
     name: Release
     runs-on: ubuntu-latest
-    if: startsWith(github.ref, 'refs/tags/')
-    needs: [linux, windows, macos, sdist]
-    strategy:
-      fail-fast: false
+    if: ${{ startsWith(github.ref, 'refs/tags/') || github.event_name == 'workflow_dispatch' }}
+    needs: [linux, musllinux, windows, macos, sdist, check_clippy_python_bindings]
+    permissions:
+      # Use to sign the release artifacts
+      id-token: write
+      # Used to upload release artifacts
+      contents: write
+      # Used to generate artifact attestation
+      attestations: write
     steps:
       - uses: actions/download-artifact@v4
+      - name: Generate artifact attestation
+        uses: actions/attest-build-provenance@v2
         with:
-          pattern: wheels-*
-          merge-multiple: true
-      - uses: actions/download-artifact@v4
-        with:
-          name: sdist
-          merge-multiple: true
+          subject-path: 'wheels-*/*'
       - name: Publish to PyPI
+        if: ${{ startsWith(github.ref, 'refs/tags/') }}
         uses: PyO3/maturin-action@v1
         env:
           PYO3_USE_ABI3_FORWARD_COMPATIBILITY: 1
           MATURIN_PYPI_TOKEN: ${{ secrets.PYPI_PASSWORD }}
         with:
           command: upload
-          args: --non-interactive --skip-existing *
+          args: --non-interactive --skip-existing wheels-*/*
diff --git a/.github/workflows/mypy.yml b/.github/workflows/mypy.yml
index 305e42f..b0efdf6 100644
--- a/.github/workflows/mypy.yml
+++ b/.github/workflows/mypy.yml
@@ -5,15 +5,28 @@ on: [push, pull_request]
 
 jobs:
   checks:
+    name: mypy Python ${{ matrix.py_version }}
     runs-on: ubuntu-latest
-    name: mypy
+    strategy:
+      fail-fast: false
+      matrix:
+        py_version:
+          - '3.8'
+          - '3.9'
+          - '3.10'
+          - '3.11'
+          - '3.12'
+          - '3.13'
+          - '3.14'
+          - '3.x' # Explicit latest
+
     steps:
       - uses: actions/checkout@v5
 
-      - name: Set up Python 3.9
-        uses: actions/setup-python@v5
+      - name: Set up Python ${{ matrix.py_version }}
+        uses: actions/setup-python@v6
         with:
-          python-version: 3.9
+          python-version: ${{ matrix.py_version }}
 
       - name: Install Dependencies
         run: |
diff --git a/.github/workflows/python_bindings.yml b/.github/workflows/python_bindings.yml
index 73a451b..46473e2 100644
--- a/.github/workflows/python_bindings.yml
+++ b/.github/workflows/python_bindings.yml
@@ -5,21 +5,37 @@ on: [push, pull_request]
 
 jobs:
   tests_cases:
-    name: Tests cases
+    name: Test for Python ${{ matrix.py_version }}
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
+      matrix:
+        py_version:
+          - '3.8'
+          - '3.9'
+          - '3.10'
+          - '3.11'
+          - '3.12'
+          - '3.13'
+          - '3.14'
+          - '3.x' # Explicit latest
 
     steps:
-    - name: Checkout repo
-      uses: actions/checkout@v5
+      - name: Checkout repo
+        uses: actions/checkout@v5
 
-    - name: Setup requirements
-      run: |
-        python3 -m pip install -U maturin
+      - name: Setup Python ${{ matrix.py_version }}
+        uses: actions/setup-python@v6
+        with:
+          python-version: ${{ matrix.py_version }}
 
-    - name: Install local crunch64
-      run: python3 -m pip install ./lib
+      - name: Setup requirements
+        run: |
+          python3 --version
+          python3 -m pip install -U maturin
 
-    - name: Run tests
-      run: python3 ./python_bindings/tests.py
+      - name: Install local crunch64
+        run: python3 -m pip install ./lib
+
+      - name: Run tests
+        run: python3 ./python_bindings/tests.py
diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index 881ab9b..fdbd987 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -62,3 +62,17 @@ jobs:
       # To find current MSRV use `cargo msrv find`. Install it with `cargo install cargo-msrv --locked`
       - name: Run MSRV checker
         run: cargo hack check --rust-version --workspace --all-targets --ignore-private
+
+  msrv_no_default:
+    name: Check MSRV
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout reposistory
+        uses: actions/checkout@v5
+
+      - name: Setup MSRV checker
+        uses: taiki-e/install-action@cargo-hack
+
+      # To find current MSRV use `cargo msrv find`. Install it with `cargo install cargo-msrv --locked`
+      - name: Run MSRV checker
+        run: cargo hack check --rust-version --workspace --all-targets --ignore-private --no-default-features
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 684d57f..db45233 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,22 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.6.0] - 2025-10-11
+
+### Added
+
+- `no_std` support.
+  - `alloc` is still required.
+- Prebuilt binaries for Python 3.14.
+- Prebuilt binaries for Python 3.8.
+
+### Changed
+
+- Python 3.8 is supported again.
+  - CI allows us to build for 3.8 again.
+- Change the hard requirement of Python 3.9 to just Python 3 in the package metadata.
+  - Note there's no official support for Python versions older than 3.8.
+
 ## [0.5.4] - 2024-12-15
 
 ### Fixed
@@ -101,7 +117,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Python bindings.
 - C bindings.
 
-[unreleased]: https://github.com/decompals/crunch64/compare/0.5.1...HEAD
+[unreleased]: https://github.com/decompals/crunch64/compare/0.6.0...HEAD
+[0.6.0]: https://github.com/decompals/crunch64/compare/0.5.3...0.6.0
 [0.5.3]: https://github.com/decompals/crunch64/compare/0.5.2...0.5.3
 [0.5.2]: https://github.com/decompals/crunch64/compare/0.5.1...0.5.2
 [0.5.1]: https://github.com/decompals/crunch64/compare/0.5.0...0.5.1
diff --git a/Cargo.lock b/Cargo.lock
index 450a9e2..b8cd98b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -130,7 +130,7 @@ dependencies = [
 
 [[package]]
 name = "crunch64"
-version = "0.5.4"
+version = "0.6.0"
 dependencies = [
  "crc32fast",
  "pyo3",
@@ -140,7 +140,7 @@ dependencies = [
 
 [[package]]
 name = "crunch64-cli"
-version = "0.5.4"
+version = "0.6.0"
 dependencies = [
  "clap",
  "crunch64",
@@ -327,11 +327,10 @@ dependencies = [
 
 [[package]]
 name = "pyo3"
-version = "0.23.5"
+version = "0.26.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7778bffd85cf38175ac1f545509665d0b9b92a198ca7941f131f85f7a4f9a872"
+checksum = "7ba0117f4212101ee6544044dae45abe1083d30ce7b29c4b5cbdfa2354e07383"
 dependencies = [
- "cfg-if",
  "indoc",
  "libc",
  "memoffset",
@@ -345,19 +344,18 @@ dependencies = [
 
 [[package]]
 name = "pyo3-build-config"
-version = "0.23.5"
+version = "0.26.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "94f6cbe86ef3bf18998d9df6e0f3fc1050a8c5efa409bf712e661a4366e010fb"
+checksum = "4fc6ddaf24947d12a9aa31ac65431fb1b851b8f4365426e182901eabfb87df5f"
 dependencies = [
- "once_cell",
  "target-lexicon",
 ]
 
 [[package]]
 name = "pyo3-ffi"
-version = "0.23.5"
+version = "0.26.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e9f1b4c431c0bb1c8fb0a338709859eed0d030ff6daa34368d3b152a63dfdd8d"
+checksum = "025474d3928738efb38ac36d4744a74a400c901c7596199e20e45d98eb194105"
 dependencies = [
  "libc",
  "pyo3-build-config",
@@ -365,9 +363,9 @@ dependencies = [
 
 [[package]]
 name = "pyo3-macros"
-version = "0.23.5"
+version = "0.26.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fbc2201328f63c4710f68abdf653c89d8dbc2858b88c5d88b0ff38a75288a9da"
+checksum = "2e64eb489f22fe1c95911b77c44cc41e7c19f3082fc81cce90f657cdc42ffded"
 dependencies = [
  "proc-macro2",
  "pyo3-macros-backend",
@@ -377,9 +375,9 @@ dependencies = [
 
 [[package]]
 name = "pyo3-macros-backend"
-version = "0.23.5"
+version = "0.26.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fca6726ad0f3da9c9de093d6f116a93c1a38e417ed73bf138472cf4064f72028"
+checksum = "100246c0ecf400b475341b8455a9213344569af29a3c841d29270e53102e0fcf"
 dependencies = [
  "heck",
  "proc-macro2",
@@ -501,24 +499,24 @@ dependencies = [
 
 [[package]]
 name = "target-lexicon"
-version = "0.12.16"
+version = "0.13.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "61c41af27dd6d1e27b1b16b489db798443478cef1f06a660c96db617ba5de3b1"
+checksum = "df7f62577c25e07834649fc3b39fafdc597c0a3527dc1c60129201ccfcbaa50c"
 
 [[package]]
 name = "thiserror"
-version = "1.0.69"
+version = "2.0.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b6aaf5339b578ea85b50e080feb250a3e8ae8cfcdff9a461c9ec2904bc923f52"
+checksum = "f63587ca0f12b72a0600bcba1d40081f830876000bb46dd2337a3051618f4fc8"
 dependencies = [
  "thiserror-impl",
 ]
 
 [[package]]
 name = "thiserror-impl"
-version = "1.0.69"
+version = "2.0.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4fee6c4efc90059e10f81e6d42c60a18f76588c3d74cb83a0b242a2b6c7504c1"
+checksum = "3ff15c8ecd7de3849db632e14d18d2571fa09dfc5ed93479bc4485c7a517c913"
 dependencies = [
  "proc-macro2",
  "quote",
diff --git a/Cargo.toml b/Cargo.toml
index 1695043..b95e8ad 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,3 +1,17 @@
 [workspace]
 members = ["lib", "cli"]
 resolver = "2"
+
+[workspace.package]
+# Version should be synced with lib/pyproject.toml and lib/crunch64/__init__.py
+version = "0.6.0"
+edition = "2021"
+repository = "https://github.com/decompals/crunch64"
+license = "MIT"
+
+# Use https://github.com/foresterre/cargo-msrv to check the MSRV
+# ```
+# cargo install cargo-msrv --locked --force
+# cargo msrv find -- cargo check -p crunch64
+# ```
+rust-version = "1.74.0"
diff --git a/cli/Cargo.toml b/cli/Cargo.toml
index 4ebb183..46579a6 100644
--- a/cli/Cargo.toml
+++ b/cli/Cargo.toml
@@ -1,16 +1,16 @@
 [package]
 name = "crunch64-cli"
-version = "0.5.4"
-edition = "2021"
+version.workspace = true
+edition.workspace = true
 description = "A utility for compressing/decompressing files with common n64 formats"
-repository = "https://github.com/decompals/crunch64"
-license = "MIT"
-rust-version = "1.74.0"
+repository.workspace = true
+license .workspace = true
+rust-version.workspace = true
 
 [[bin]]
 name = "crunch64"
 path = "src/main.rs"
 
 [dependencies]
-crunch64 = { version = "0.5.4", path = "../lib" }
+crunch64 = { version = "0.6.0", path = "../lib" }
 clap = { version = "4.4.11", features = ["derive"] }
diff --git a/lib/Cargo.toml b/lib/Cargo.toml
index 3895fd7..8ef9595 100644
--- a/lib/Cargo.toml
+++ b/lib/Cargo.toml
@@ -1,12 +1,12 @@
 [package]
 name = "crunch64"
-# Version should be synced with lib/pyproject.toml and lib/crunch64/__init__.py
-version = "0.5.4"
-edition = "2021"
+version.workspace = true
+edition.workspace = true
 description = "A library for handling common compression formats for N64 games"
-repository = "https://github.com/decompals/crunch64"
-license = "MIT"
-rust-version = "1.74.0"
+repository.workspace = true
+license.workspace = true
+rust-version.workspace = true
+categories = ["no-std"]
 
 [lib]
 name = "crunch64"
@@ -15,12 +15,16 @@ crate-type = ["lib", "staticlib", "cdylib"]
 
 [dependencies]
 crc32fast = "1.4.2"
-pyo3 = { version="0.23.5", features = ["extension-module"], optional = true }
-thiserror = "1.0"
+pyo3 = { version="0.26", features = ["extension-module", "abi3"], optional = true }
+thiserror = { version="2", default-features = false }
 
 [dev-dependencies]
 rstest = "0.18.2"
 
 [features]
+default = []
+
+std = ["thiserror/std"]
+
 c_bindings = []
-python_bindings = ["dep:pyo3"]
+python_bindings = ["dep:pyo3", "std"]
diff --git a/lib/crunch64/__init__.py b/lib/crunch64/__init__.py
index 1a6a2cf..3362a43 100644
--- a/lib/crunch64/__init__.py
+++ b/lib/crunch64/__init__.py
@@ -3,7 +3,7 @@
 from __future__ import annotations
 
 # Version should be synced with lib/Cargo.toml and lib/pyproject.toml
-__version_info__ = (0, 5, 3)
+__version_info__ = (0, 6, 0)
 __version__ = ".".join(map(str, __version_info__))
 __author__ = "decompals"
 
diff --git a/lib/pyproject.toml b/lib/pyproject.toml
index 1aae951..4d1be01 100644
--- a/lib/pyproject.toml
+++ b/lib/pyproject.toml
@@ -1,9 +1,9 @@
 [project]
 name = "crunch64"
 # Version should be synced with lib/Cargo.toml and lib/crunch64/__init__.py
-version = "0.5.4"
+version = "0.6.0"
 description = "A library for handling common compression formats for N64 games"
-requires-python = ">=3.9"
+requires-python = ">=3.0"
 dependencies = [
 ]
 classifiers = [
diff --git a/lib/src/gzip.rs b/lib/src/gzip.rs
index f106aa7..06180d4 100644
--- a/lib/src/gzip.rs
+++ b/lib/src/gzip.rs
@@ -5,6 +5,9 @@
 // original gzip code and https://datatracker.ietf.org/doc/html/rfc1951 for
 // details on the DEFLATE compression format.
 
+use alloc::{boxed::Box, vec::Vec};
+use core::cmp;
+
 use crate::{utils, Crunch64Error};
 
 // Bitstream writer for compressed output
@@ -146,13 +149,13 @@ struct Tree {
 }
 
 impl Ord for Tree {
-    fn cmp(&self, other: &Self) -> std::cmp::Ordering {
+    fn cmp(&self, other: &Self) -> cmp::Ordering {
         (self.freq, self.depth).cmp(&(other.freq, other.depth))
     }
 }
 
 impl PartialOrd for Tree {
-    fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
+    fn partial_cmp(&self, other: &Self) -> Option<cmp::Ordering> {
         Some(self.cmp(other))
     }
 }
@@ -253,7 +256,7 @@ impl HuffmanCode {
             let new_tree = Tree {
                 root: new_node,
                 freq: node1.freq + node2.freq,
-                depth: 1 + std::cmp::max(node1.depth, node2.depth),
+                depth: 1 + cmp::max(node1.depth, node2.depth),
             };
             heap.replace_min(new_tree);
         }
@@ -731,7 +734,7 @@ impl BlockWriter {
         } else {
             usize::MAX
         };
-        let compressed_size_bytes = std::cmp::min(fixed_size_bytes, dynamic_size_bytes);
+        let compressed_size_bytes = cmp::min(fixed_size_bytes, dynamic_size_bytes);
 
         // Write block
         output.write_bits(eof as u16, 1);
@@ -916,7 +919,7 @@ pub fn compress(bytes: &[u8], level: usize, small_mem: bool) -> Result<Box<[u8]>
         .copy_from_slice(ORIGINAL_GZIP_GARBAGE);
 
     // Position in input buffer
-    let mut input_pos = std::cmp::min(2 * WINDOW_SIZE, input_size);
+    let mut input_pos = cmp::min(2 * WINDOW_SIZE, input_size);
     // True if we have reached the end of input
     let mut eof: bool = input_size < 2 * WINDOW_SIZE;
     // Length of current block
@@ -999,7 +1002,7 @@ pub fn compress(bytes: &[u8], level: usize, small_mem: bool) -> Result<Box<[u8]>
                 }
             }
 
-            best_len = std::cmp::min(best_len, lookahead);
+            best_len = cmp::min(best_len, lookahead);
             if best_len == MIN_MATCH && pos - best_pos > TOO_FAR {
                 best_len = MIN_MATCH - 1;
             }
@@ -1080,7 +1083,7 @@ pub fn compress(bytes: &[u8], level: usize, small_mem: bool) -> Result<Box<[u8]>
             }
 
             let refill_start = input_pos;
-            let refill_end = std::cmp::min(refill_start + WINDOW_SIZE, input_size);
+            let refill_end = cmp::min(refill_start + WINDOW_SIZE, input_size);
             let refill_size = refill_end - refill_start;
             window[WINDOW_SIZE..WINDOW_SIZE + refill_size]
                 .copy_from_slice(&bytes[refill_start..refill_end]);
@@ -1112,7 +1115,7 @@ pub fn compress(bytes: &[u8], level: usize, small_mem: bool) -> Result<Box<[u8]>
 
 #[cfg(feature = "c_bindings")]
 mod c_bindings {
-    use std::ffi::c_int;
+    use core::ffi::c_int;
 
     #[no_mangle]
     pub extern "C" fn crunch64_gzip_compress_bound(
@@ -1189,6 +1192,7 @@ pub(crate) mod python_bindings {
 }
 
 #[cfg(test)]
+#[cfg(feature = "std")]
 mod tests {
     use crate::Crunch64Error;
     use core::panic;
diff --git a/lib/src/lib.rs b/lib/src/lib.rs
index 3f5036f..bb38bd1 100644
--- a/lib/src/lib.rs
+++ b/lib/src/lib.rs
@@ -1,3 +1,8 @@
+#![cfg_attr(not(feature = "std"), no_std)]
+
+#[macro_use]
+extern crate alloc;
+
 pub mod gzip;
 pub mod mio0;
 pub mod yay0;
diff --git a/lib/src/mio0.rs b/lib/src/mio0.rs
index 21cd380..0561b89 100644
--- a/lib/src/mio0.rs
+++ b/lib/src/mio0.rs
@@ -1,3 +1,5 @@
+use alloc::{boxed::Box, vec::Vec};
+
 use crate::{utils, Crunch64Error};
 
 fn parse_header(bytes: &[u8]) -> Result<(usize, usize, usize), Crunch64Error> {
@@ -304,6 +306,7 @@ pub(crate) mod python_bindings {
 }
 
 #[cfg(test)]
+#[cfg(feature = "std")]
 mod tests {
     use crate::Crunch64Error;
     use core::panic;
diff --git a/lib/src/utils.rs b/lib/src/utils.rs
index c59d241..7cf045d 100644
--- a/lib/src/utils.rs
+++ b/lib/src/utils.rs
@@ -1,4 +1,4 @@
-use std::cmp;
+use core::cmp;
 
 use crate::Crunch64Error;
 
@@ -36,12 +36,12 @@ pub fn read_u32(bytes: &[u8], offset: usize) -> Result<u32, Crunch64Error> {
 pub(crate) fn u8_vec_from_pointer_array(
     src_len: usize,
     src: *const u8,
-) -> Result<Vec<u8>, Crunch64Error> {
+) -> Result<alloc::vec::Vec<u8>, Crunch64Error> {
     if src.is_null() {
         return Err(Crunch64Error::NullPointer);
     }
 
-    let mut bytes = Vec::with_capacity(src_len);
+    let mut bytes = alloc::vec::Vec::with_capacity(src_len);
 
     for i in 0..src_len {
         bytes.push(unsafe { *src.add(i) });
diff --git a/lib/src/yay0.rs b/lib/src/yay0.rs
index c27544a..379b4d9 100644
--- a/lib/src/yay0.rs
+++ b/lib/src/yay0.rs
@@ -1,3 +1,5 @@
+use alloc::{boxed::Box, vec::Vec};
+
 use crate::{utils, Crunch64Error};
 
 fn parse_header(bytes: &[u8]) -> Result<(usize, usize, usize), Crunch64Error> {
@@ -317,6 +319,7 @@ pub(crate) mod python_bindings {
 }
 
 #[cfg(test)]
+#[cfg(feature = "std")]
 mod tests {
     use crate::Crunch64Error;
     use core::panic;
diff --git a/lib/src/yaz0.rs b/lib/src/yaz0.rs
index 9ec6fce..59bb098 100644
--- a/lib/src/yaz0.rs
+++ b/lib/src/yaz0.rs
@@ -1,5 +1,7 @@
 // Based on https://gist.github.com/Mr-Wiseguy/6cca110d74b32b5bb19b76cfa2d7ab4f
 
+use alloc::{boxed::Box, vec::Vec};
+
 use crate::{utils, Crunch64Error};
 
 fn parse_header(bytes: &[u8]) -> Result<usize, Crunch64Error> {
@@ -305,6 +307,7 @@ pub(crate) mod python_bindings {
 }
 
 #[cfg(test)]
+#[cfg(feature = "std")]
 mod tests {
     use crate::Crunch64Error;
     use core::panic;
diff --git a/mypy.ini b/mypy.ini
index 2145f40..31671bd 100644
--- a/mypy.ini
+++ b/mypy.ini
@@ -1,3 +1,2 @@
 [mypy]
-python_version = 3.9
 check_untyped_defs = True