diff --git a/algebra.cabal b/algebra.cabal
--- a/algebra.cabal
+++ b/algebra.cabal
@@ -1,6 +1,6 @@
 name:          algebra
 category:      Math, Algebra
-version:       2.1
+version:       2.1.1
 license:       BSD3
 cabal-version: >= 1.6
 license-file:  LICENSE
@@ -35,18 +35,18 @@
   build-depends:
     array                   >= 0.3.0.2 && < 0.5,
     base                    >= 4       && < 5,
-    distributive            >= 0.2     && < 0.3,
-    transformers            >= 0.2     && < 0.3,
-    tagged                  >= 0.2.2.3 && < 0.3,
+    distributive            >= 0.2.2   && < 0.3,
+    transformers            >= 0.2     && < 0.4,
+    tagged                  >= 0.4.2   && < 0.5,
     categories              >= 1.0     && < 1.1,
     containers              >= 0.3     && < 0.5,
-    keys                    >= 2.1.2   && < 2.2,
-    mtl                     >= 2       && < 2.1,
-    semigroups              >= 0.8     && < 0.9,
-    semigroupoids           >= 1.2.6.1 && < 1.3,
-    representable-functors  >= 2.1.2   && < 2.2,
-    representable-tries     >= 2.0.4   && < 2.1,
-    void                    >= 0.5.4.3 && < 0.6
+    keys                    >= 2.1.3   && < 2.2,
+    mtl                     >= 2.0.1   && < 2.2,
+    semigroups              >= 0.8.2   && < 0.9,
+    semigroupoids           >= 1.3.1   && < 1.4,
+    representable-functors  >= 2.2.1   && < 2.3,
+    representable-tries     >= 2.2.1   && < 2.3,
+    void                    >= 0.5.5.1 && < 0.6
 
   exposed-modules:
     Numeric.Additive.Class
@@ -112,4 +112,4 @@
     Numeric.Semiring.Integral
     Numeric.Semiring.Involutive
 
-  ghc-options: -Wall 
+  ghc-options: -Wall