diff --git a/requirements.txt b/requirements.txt
index acfd0fd42..7d5ee69ea 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,6 +4,6 @@ brotli==1.0.7; platform_python_implementation != "PyPy"
 brotlipy==0.7.0; platform_python_implementation == "PyPy"
 unicodedata2==11.0.0; python_version < '3.7' and platform_python_implementation != "PyPy"
 scipy==1.2.1; platform_python_implementation != "PyPy"
-munkres==1.0.12; platform_python_implementation == "PyPy"
+munkres==1.0.12; platform_python_implementation == "PyPy"  # pyup: ignore
 zopfli==0.1.6
 fs==2.3.1