diff --git a/pyproject.toml b/pyproject.toml
index 51c67df..4f3480c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -20,7 +20,7 @@ keywords = [
     "image processing",
 ]
 license = {text = "MIT"}
-requires-python = ">=3.3"
+requires-python = ">=3.7"
 classifiers = [
     "Development Status :: 5 - Production/Stable",
     "Environment :: Console",
@@ -32,10 +32,6 @@ classifiers = [
     "Programming Language :: Python",
     "Programming Language :: Python :: 3",
     "Programming Language :: Python :: 3 :: Only",
-    "Programming Language :: Python :: 3.3",
-    "Programming Language :: Python :: 3.4",
-    "Programming Language :: Python :: 3.5",
-    "Programming Language :: Python :: 3.6",
     "Programming Language :: Python :: 3.7",
     "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",