diff --git a/perf-analysis.cabal b/perf-analysis.cabal
--- a/perf-analysis.cabal
+++ b/perf-analysis.cabal
@@ -2,10 +2,10 @@
 --
 -- see: https://github.com/sol/hpack
 --
--- hash: 97459822690cecba4e6db836b86eedf2d10cc0a7f8ff32e4c525614241b4af82
+-- hash: 5b2bb96e01227ec3ddd4c29e4bebf5895c909acff05541ea597f16b063ce3eb4
 
 name:           perf-analysis
-version:        0.0.1.0
+version:        0.0.1.1
 synopsis:       analysis example using perf
 description:     Analytical tools to use with perf. 
 category:       performance
@@ -37,7 +37,7 @@
       base >=4.7 && <4.12
     , deepseq
     , formatting
-    , perf
+    , perf >=0.4.1.0
     , protolude
     , scientific
     , tdigest
@@ -58,7 +58,7 @@
     , deepseq
     , formatting
     , optparse-generic
-    , perf
+    , perf >=0.4.1.0
     , perf-analysis
     , protolude
     , scientific
diff --git a/stack.yaml b/stack.yaml
--- a/stack.yaml
+++ b/stack.yaml
@@ -1,4 +1,4 @@
-resolver: nightly-2018-04-05
+resolver: nightly-2018-05-28
 
 packages:
   - .