diff --git a/flake8_unused_fixtures.py b/flake8_unused_fixtures.py
index 1d73195..2c53f43 100644
--- a/flake8_unused_fixtures.py
+++ b/flake8_unused_fixtures.py
@@ -1,8 +1,14 @@
 import ast
+import sys
 from typing import Any, Generator, List, Tuple, Type, Union
 
 import pkg_resources
 
+if sys.version_info >= (3, 9):
+    from ast import unparse
+else:
+    from astunparse import unparse
+
 MSG = "FUF100 fixture <{}> not used"
 
 
@@ -33,7 +39,7 @@ def _check_for_unused_fixtures(
             all_fixture_names = [
                 arg.arg for arg in node.args.args if arg.arg not in skip_fixtures
             ]
-            body_as_str = ast.unparse(node.body)
+            body_as_str = unparse(node.body)
             for fixture_name, fixture in zip(all_fixture_names, node.args.args):
                 if fixture_name not in body_as_str:
                     self.problems.append(
diff --git a/poetry.lock b/poetry.lock
index d6ad7bd..527df42 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -10,7 +10,7 @@ python-versions = "*"
 name = "astpretty"
 version = "3.0.0"
 description = "Pretty print the output of python stdlib `ast.parse`."
-category = "main"
+category = "dev"
 optional = false
 python-versions = ">=3.8"
 
@@ -28,6 +28,17 @@ six = "*"
 [package.extras]
 test = ["astroid (<=2.5.3)", "pytest"]
 
+[[package]]
+name = "astunparse"
+version = "1.6.3"
+description = "An AST unparser for Python"
+category = "main"
+optional = false
+python-versions = "*"
+
+[package.dependencies]
+six = ">=1.6.1,<2.0"
+
 [[package]]
 name = "atomicwrites"
 version = "1.4.1"
@@ -215,7 +226,7 @@ testing = ["Django (<3.1)", "colorama", "docopt", "pytest (<7.0.0)"]
 
 [[package]]
 name = "matplotlib-inline"
-version = "0.1.3"
+version = "0.1.5"
 description = "Inline Matplotlib backend for Jupyter"
 category = "dev"
 optional = false
@@ -415,7 +426,7 @@ testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "pygments (>=2.
 name = "six"
 version = "1.16.0"
 description = "Python 2 and 3 compatibility utilities"
-category = "dev"
+category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*"
 
@@ -480,13 +491,14 @@ python-versions = "*"
 
 [metadata]
 lock-version = "1.1"
-python-versions = "^3.8"
-content-hash = "c9296341ac5c9c89c6032fe81ebba0fe5f38930fc7e4a8c936c59ad7fdedc3da"
+python-versions = "^3.9"
+content-hash = "41670b61962e80a7aaa74c0e0639792761bdb777a3b08950e659fb726c249c3d"
 
 [metadata.files]
 appnope = []
 astpretty = []
 asttokens = []
+astunparse = []
 atomicwrites = []
 attrs = []
 backcall = [
@@ -516,8 +528,8 @@ jedi = [
     {file = "jedi-0.18.1.tar.gz", hash = "sha256:74137626a64a99c8eb6ae5832d99b3bdd7d29a3850fe2aa80a4126b2a7d949ab"},
 ]
 matplotlib-inline = [
-    {file = "matplotlib-inline-0.1.3.tar.gz", hash = "sha256:a04bfba22e0d1395479f866853ec1ee28eea1485c1d69a6faf00dc3e24ff34ee"},
-    {file = "matplotlib_inline-0.1.3-py3-none-any.whl", hash = "sha256:aed605ba3b72462d64d475a21a9296f400a19c4f74a31b59103d2a99ffd5aa5c"},
+    {file = "matplotlib-inline-0.1.5.tar.gz", hash = "sha256:a728d796a1a44265b310340ef04ba8aba4e89dcb76dfdd1272becab4923dd867"},
+    {file = "matplotlib_inline-0.1.5-py3-none-any.whl", hash = "sha256:a68624e181d5b272bbfbaadb44412c9d3c9ebbcb703404502b9c937afc377ff5"},
 ]
 mccabe = []
 mypy-extensions = [
diff --git a/pyproject.toml b/pyproject.toml
index 70216a3..0052994 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,26 +4,29 @@ version = "0.1.1"
 description = "Warn about unnecesary fixtures in tests definition."
 authors = ["Marcin Binkowski <binq661@gmail.com>"]
 repository = "https://github.com/MarcinBinkowski/flake8_unused_fixtures"
-license = "BSD-2-Clause"
+readme = "README.md"
+license = "BSD-3-Clause"
 keywords = ["flake8", "lint"]
 classifiers=[
     "Intended Audience :: Developers",
     "Environment :: Console",
-    "Programming Language :: Python :: 3.9",
+    "Programming Language :: Python",
     "Operating System :: OS Independent",
     "License :: OSI Approved :: BSD License",
 ]
 
 [tool.poetry.dependencies]
-python = "^3.9"
-astpretty = "^3.0.0"
+python = "^3.8"
 flake8 = "^5.0.4"
+astunparse = "^1.6.3"
 
 [tool.poetry.dev-dependencies]
 black = "^22.6.0"
 isort = "^5.10.1"
 pytest = "^7.1.2"
 ipdb = "^0.13.9"
+astpretty = "^3.0.0"
+
 
 [tool.isort]
 profile = "black"