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: 1.8.1.2
+version: 1.8.1.3
 category: Hasql, Database, PostgreSQL
 synopsis: Fast PostgreSQL driver with a flexible mapping API
 description:
@@ -156,6 +156,7 @@
 
 library testing-kit
   import: base
+  visibility: private
   hs-source-dirs: testing-kit
   exposed-modules:
     Hasql.TestingKit.Constants