diff --git a/stack.yaml b/stack.yaml
index 75caae8..3bdb1e8 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -11,3 +11,14 @@ extra-deps:
   - acid-state-0.12.4
   - nonce-1.0.2
   - wai-session-0.3.1
+
+  # <https://github.com/fpco/stack/issues/120>
+  - cookie-0.4.1.5
+  - data-default-0.5.3
+  - data-default-class-0.0.1
+  - data-default-instances-base-0.0.1
+  - data-default-instances-containers-0.0.1
+  - data-default-instances-dlist-0.0.1
+  - data-default-instances-old-locale-0.0.1
+  - wai-extra-3.0.7.1
+  - yesod-core-1.4.9.1