diff --git a/Cargo.lock b/Cargo.lock
index a1ca4df..607faca 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,6 +1,6 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "autocfg"
@@ -22,7 +22,7 @@ checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
 [[package]]
 name = "gil-knocker"
-version = "0.4.1"
+version = "0.4.2"
 dependencies = [
  "parking_lot",
  "pyo3",
diff --git a/Cargo.toml b/Cargo.toml
index 9859d87..6028a14 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "gil-knocker"
-version = "0.4.1"
+version = "0.4.2"
 edition = "2021"
 authors = ["Miles Granger <miles59923@gmail.com>"]
 license = "MIT"
diff --git a/pyproject.toml b/pyproject.toml
index 4f399d8..d13d96d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,7 +1,7 @@
 [project]
 name = "gilknocker"
 keywords = ["GIL"]
-requires-python = ">=3.7"
+requires-python = ">=3.9"
 
 [project.urls]
 homepage = "https://github.com/milesgranger/gilknocker"