diff --git a/pkgs/by-name/ca/calibre-web/package.nix b/pkgs/by-name/ca/calibre-web/package.nix
index b2045d0570a3..75da25427c3b 100644
--- a/pkgs/by-name/ca/calibre-web/package.nix
+++ b/pkgs/by-name/ca/calibre-web/package.nix
@@ -36,6 +36,7 @@ python.pkgs.buildPythonApplication rec {
     flask-principal
     flask-wtf
     iso-639
+    jsonschema
     lxml
     pypdf
     python-magic