diff --git a/stack.yaml b/stack.yaml
index 45dee205be..add226ad3a 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -15,3 +15,4 @@ extra-deps:
 - prettyprinter-interp-0.2.0.0@sha256:45299b61bd6c27d594c1a72b5a8dd5734e791a59828725e4f4e420f3cc37232b,2016
 - infinite-list-0.1@sha256:4de250517ce75e128c766fbc1f23b5a778ea964e695e47f8e83e0f3b293091bf,2383
 - tasty-1.5@sha256:c62c96da1e9d65bf61ce583e9f7085eed1daeb62a45f3106ca252bf9ef87025b,2763
+- attoparsec-aeson-2.1.0.0