diff --git a/servant-quickcheck.cabal b/servant-quickcheck.cabal
index 90b2349..d00fa7e 100644
--- a/servant-quickcheck.cabal
+++ b/servant-quickcheck.cabal
@@ -49,9 +49,9 @@ library
     , pretty                 >=1.1    && <1.2
     , process                >=1.2    && <1.7
     , QuickCheck             >=2.7    && <2.15
-    , servant                >=0.17   && <0.18
-    , servant-client         >=0.17   && <0.18
-    , servant-server         >=0.17   && <0.18
+    , servant                >=0.15   && <0.18
+    , servant-client         >=0.15   && <0.18
+    , servant-server         >=0.15   && <0.18
     , split                  >=0.2    && <0.3
     , string-conversions     >=0.3    && <0.5
     , temporary              >=1.2    && <1.4