diff --git a/tahoe-chk.cabal b/tahoe-chk.cabal
index 6a050c5ea31abd18a65032ae0354cbd61ec12470..1aa81e166dcd49786c4b26bfba3fcf64b9417104 100644
--- a/tahoe-chk.cabal
+++ b/tahoe-chk.cabal
@@ -144,6 +144,6 @@ test-suite tahoe-chk-tests
     , text               >=1.2.3.1  && <1.3
     , tree-diff          >=0.1      && <0.3
     , vector             >=0.12.1.2 && <0.13
-    , yaml               <0.11.9.0  || >=0.11.9.0.0
+    , yaml               >=0.11.5.0 && <0.11.9.0 || >=0.11.9.0.0 && <0.12
 
   default-language:   Haskell2010