diff --git a/.ci/stack-9.4.yaml b/.ci/stack-9.4.yaml
index 431742e5cc..af73a00164 100644
--- a/.ci/stack-9.4.yaml
+++ b/.ci/stack-9.4.yaml
@@ -18,3 +18,4 @@ extra-deps:
  - git: https://github.com/christiaanb/hint.git
    commit: 7803c34c8ae1d83c0f7c13fe6b30fcb3abd0ac51
  - tasty-1.5@sha256:c62c96da1e9d65bf61ce583e9f7085eed1daeb62a45f3106ca252bf9ef87025b,2763
+ - attoparsec-aeson-2.1.0.0@sha256:fa83aba43bfa58490de8f274d19b9d58b6403a207b12cac5f93922102b084c52,1154