diff --git a/fs-api/fs-api.cabal b/fs-api/fs-api.cabal
index d2b7177..6592a39 100644
--- a/fs-api/fs-api.cabal
+++ b/fs-api/fs-api.cabal
@@ -51,7 +51,7 @@ library
     , digest
     , directory   >=1.3  && <1.4
     , filepath    >=1.4  && <1.5
-    , io-classes  >=0.3  && <1.3
+    , io-classes  >=0.3  && <1.4
     , text        >=1.2  && <2.1
 
   if os(windows)
diff --git a/fs-sim/fs-sim.cabal b/fs-sim/fs-sim.cabal
index cb92526..fee115a 100644
--- a/fs-sim/fs-sim.cabal
+++ b/fs-sim/fs-sim.cabal
@@ -38,10 +38,10 @@ library
     , bytestring         >=0.10 && <0.12
     , containers         >=0.5  && <0.7
     , fs-api             ^>=0.2
-    , io-classes         >=0.3  && <1.3
+    , io-classes         >=0.3  && <1.4
     , mtl
     , QuickCheck
-    , strict-stm         >=0.3  && <1.3
+    , strict-stm         >=0.3  && <1.4
     , text               >=1.2  && <2.1
 
   ghc-options: