diff --git a/qrcode/tests/test_qrcode_pypng.py b/qrcode/tests/test_qrcode_pypng.py
index 0245b20..c502a3b 100644
--- a/qrcode/tests/test_qrcode_pypng.py
+++ b/qrcode/tests/test_qrcode_pypng.py
@@ -1,13 +1,16 @@
 import io
 from unittest import mock
 
-import png
+import pytest
+
 
 import qrcode
 import qrcode.util
 from qrcode.image.pure import PyPNGImage
 from qrcode.tests.consts import UNICODE_TEXT
 
+png = pytest.importorskip("png", reason="png is not installed")
+
 
 def test_render_pypng():
     qr = qrcode.QRCode()
diff --git a/qrcode/tests/test_script.py b/qrcode/tests/test_script.py
index fbb8b28..5135b1f 100644
--- a/qrcode/tests/test_script.py
+++ b/qrcode/tests/test_script.py
@@ -48,6 +48,7 @@ def test_stdin_py3_unicodedecodeerror():
 
 
 def test_optimize():
+    pytest.importorskip("PyPNG", reason="Requires PyPNG")
     main("testtext --optimize 0".split())