diff --git a/stack.yaml b/stack.yaml
index 2ccc290f2..20de8d453 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -2,9 +2,8 @@ resolver: lts-22.44 # 2025-05-02, GHC 9.6.7
 
 nix:
   packages:
-    - pcre
-    - pkgconfig
-    - postgresql
+    - libpq
+    - pkg-config
     - zlib
   # disable pure by default so that the test environment can be passed
   pure: false