diff --git a/CHANGES.markdown b/CHANGES.markdown
--- a/CHANGES.markdown
+++ b/CHANGES.markdown
@@ -1,3 +1,8 @@
+0.6.0.1: 7 January 2013
+-----------------------
+
+* allow `semigroups-0.9`
+
 0.6: 11 December 2012
 ---------------------
 
diff --git a/diagrams-core.cabal b/diagrams-core.cabal
--- a/diagrams-core.cabal
+++ b/diagrams-core.cabal
@@ -1,5 +1,5 @@
 Name:                diagrams-core
-Version:             0.6
+Version:             0.6.0.1
 Synopsis:            Core libraries for diagrams EDSL
 Description:         The core modules underlying diagrams,
                      an embedded domain-specific language
@@ -35,7 +35,7 @@
 
   Build-depends:       base >= 4.2 && < 4.7,
                        containers >= 0.3 && < 0.6,
-                       semigroups >= 0.3.4 && < 0.9,
+                       semigroups >= 0.3.4 && < 0.10,
                        vector-space >= 0.8.4 && < 0.9,
                        vector-space-points >= 0.1 && < 0.2,
                        MemoTrie >= 0.4.7 && < 0.7,