diff --git a/tahoe-chk.cabal b/tahoe-chk.cabal
index b9bc4407c4b3ca890f92384af19a1dc049ea4b9a..64ad9c149cae6c49751b43e6fa7942e642ab874c 100644
--- a/tahoe-chk.cabal
+++ b/tahoe-chk.cabal
@@ -65,7 +65,7 @@ library
     , concurrency         >=1.11     && <2
     , containers          >=0.6.0.1  && <0.7
     , cryptonite          >=0.27     && <0.31
-    , deepseq
+    , deepseq             >=1.1      && <1.6
     , directory           >=1.3.3    && <1.4
     , extra               >=1.7.7    && <1.8
     , fec                 >=0.1.1    && <0.2