diff --git a/libs/@local/hql/diagnostics/Cargo.toml b/libs/@local/hql/diagnostics/Cargo.toml
index 94d2ddeda2f..ba2453826ec 100644
--- a/libs/@local/hql/diagnostics/Cargo.toml
+++ b/libs/@local/hql/diagnostics/Cargo.toml
@@ -11,7 +11,7 @@ authors.workspace = true
 [dependencies]
 # Public workspace dependencies
 hql-span = { workspace = true, public = true }
-error-stack = { workspace = true, public = true }
+error-stack = { workspace = true, public = true, features = ["unstable"]}
 
 # Public third-party dependencies
 anstyle = { workspace = true, public = true }
diff --git a/libs/deer/package.json b/libs/deer/package.json
index 3aebfed5bdc..e7ed9ab347f 100644
--- a/libs/deer/package.json
+++ b/libs/deer/package.json
@@ -9,5 +9,8 @@
     "lint:clippy": "just clippy",
     "test:miri": "just miri",
     "test:unit": "just test-or-coverage"
+  },
+  "dependencies": {
+    "@rust/error-stack": "0.5.0"
   }
 }