diff --git a/maestro-sdk.cabal b/maestro-sdk.cabal
index 145efc1..0df89b4 100644
--- a/maestro-sdk.cabal
+++ b/maestro-sdk.cabal
@@ -95,9 +95,9 @@ library
       http-client-tls ^>=0.3,
       http-types ^>=0.12,
       retry ^>=0.9,
-      servant ^>=0.20,
-      servant-client ^>=0.20,
-      servant-client-core ^>=0.20,
+      servant ^>=0.19 || ^>=0.20,
+      servant-client ^>=0.19 || ^>=0.20,
+      servant-client-core ^>=0.19 || ^>=0.20,
       text ^>=1.2 || ^>=2.0,
       time ^>=1.9 || ^>=1.11 || ^>=1.12