diff --git a/reducers.cabal b/reducers.cabal
--- a/reducers.cabal
+++ b/reducers.cabal
@@ -1,6 +1,6 @@
 name:          reducers
 category:      Data, Math, Numerical, Semigroups
-version:       3.10.2
+version:       3.10.2.1
 license:       BSD3
 cabal-version: >= 1.6
 license-file:  LICENSE
@@ -25,7 +25,7 @@
   build-depends:
     base                   >= 4        && < 5,
     array                  >= 0.3      && < 0.6,
-    transformers           >= 0.2      && < 0.4,
+    transformers           >= 0.2      && < 0.5,
     bytestring             >= 0.9.1    && < 0.11,
     containers             >= 0.3      && < 0.6,
     fingertree             >= 0.1      && < 0.2,