diff --git a/hasql.cabal b/hasql.cabal
--- a/hasql.cabal
+++ b/hasql.cabal
@@ -1,6 +1,6 @@
 cabal-version:      3.0
 name:               hasql
-version:            1.6.3.1
+version:            1.6.3.2
 category:           Hasql, Database, PostgreSQL
 synopsis:           An efficient PostgreSQL driver with a flexible mapping API
 description:
@@ -109,7 +109,7 @@
     , mtl >=2 && <3
     , network-ip >=0.3.0.3 && <0.4
     , postgresql-binary >=0.13.1 && <0.14
-    , postgresql-libpq >=0.10 && <0.11
+    , postgresql-libpq >=0.9 && <0.11
     , profunctors >=5.1 && <6
     , scientific >=0.3 && <0.4
     , text >=1 && <3