diff --git a/pkgs/by-name/cy/cyclonedx-python/package.nix b/pkgs/by-name/cy/cyclonedx-python/package.nix
index 431696e03d6f..8fb0e1c42da5 100644
--- a/pkgs/by-name/cy/cyclonedx-python/package.nix
+++ b/pkgs/by-name/cy/cyclonedx-python/package.nix
@@ -30,6 +30,10 @@ python3Packages.buildPythonApplication (finalAttrs: {
     ]
     ++ cyclonedx-python-lib.optional-dependencies.validation;
 
+  pythonRelaxDeps = [
+    "chardet"
+  ];
+
   pythonImportsCheck = [ "cyclonedx" ];
 
   meta = {