diff --git a/setup.py b/setup.py
index 343cbe3..0cfb4c2 100644
--- a/setup.py
+++ b/setup.py
@@ -135,6 +135,6 @@ def run(self):
     packages = ["photoidx", "photoidx.qt"],
     scripts = ["scripts/photo-idx.py", "scripts/imageview.py"],
     python_requires = ">=3.6",
-    install_requires = ["packaging", "PyYAML", "ExifRead >= 2.2.0"],
+    install_requires = ["packaging", "PyYAML", "ExifRead >= 2.2.0", "PySide2"],
     cmdclass = dict(cmdclass, build_py=build_py, sdist=sdist, meta=meta),
 )