diff --git a/pkgs/by-name/so/sonarr/update.py b/pkgs/by-name/so/sonarr/update.py
index aef98f3ab496..80dc8e5f7552 100644
--- a/pkgs/by-name/so/sonarr/update.py
+++ b/pkgs/by-name/so/sonarr/update.py
@@ -112,7 +112,7 @@ new_yarn_hash = nix_hash_to_sri(subprocess.run(
 
 package_dir = package_attrs["dir"]
 package_file_name = "package.nix"
-deps_file_name = "deps.nix"
+deps_file_name = "deps.json"
 
 # To update deps.nix, we copy the package to a temporary directory and run
 # passthru.fetch-deps script there.