diff --git a/app/venn.hs b/app/venn.hs
--- a/app/venn.hs
+++ b/app/venn.hs
@@ -196,10 +196,10 @@
   (defaultTextStyle & set #color colorText,) <$>
   (replicate 7 "" <> (phraseText <$> mainPhrases) <> [""])
 
-writeVenn :: [Colour] -> Double -> IO ()
-writeVenn cs o = writeChartsWith "other/venn.svg" (defaultSvgOptions & set #scaleCharts' NoScaleCharts & set #svgAspect ChartAspect & set #svgHeight 100) ([phraseChart (Phrase "λ" (Point 0 (-0.2)) 0.8 0 (Colour 0.1 0 0.2 1) "chart-svg" 1)] <> (zipWith (\p c -> Chart (GlyphA $ seg p c) [SP 0.0 0.0]) [outerseg1, outerseg2, outerseg3, midseg1, midseg2, midseg3] cs) <> [Chart BlankA [SR (-1.5) 1.5 (-1.5) 1.5]])
+writeVenn :: [Colour] -> IO ()
+writeVenn cs = writeChartsWith "other/venn.svg" (defaultSvgOptions & set #scaleCharts' NoScaleCharts & set #svgAspect ChartAspect & set #svgHeight 100) ([phraseChart (Phrase "λ" (Point 0 (-0.2)) 0.8 0 (Colour 0.1 0 0.2 1) "chart-svg" 1)] <> (zipWith (\p c -> Chart (GlyphA $ seg p c) [SP 0.0 0.0]) [outerseg1, outerseg2, outerseg3, midseg1, midseg2, midseg3] cs) <> [Chart BlankA [SR (-1.5) 1.5 (-1.5) 1.5]])
 
 main :: IO ()
 main = do
   writeVennWords
-  writeVenn palette 0.8
+  writeVenn palette
diff --git a/chart-svg.cabal b/chart-svg.cabal
--- a/chart-svg.cabal
+++ b/chart-svg.cabal
@@ -1,15 +1,15 @@
-cabal-version: >= 1.10
+cabal-version: 3.0
 name:           chart-svg
-version:        0.0.2
-synopsis:       See readme.md
-description:    See readme.md for description.
+version:        0.0.3
+synopsis:       Charts in SVG
+description:    Chart library targetting SVG.
 category:       project
 homepage:       https://github.com/tonyday567/chart-svg#readme
 bug-reports:    https://github.com/tonyday567/chart-svg/issues
 author:         Tony Day
 maintainer:     tonyday567@gmail.com
 copyright:      Tony Day (c) 2017
-license:        BSD3
+license:        BSD-3-Clause
 license-file:   LICENSE
 build-type:     Simple
 extra-source-files:
@@ -42,20 +42,20 @@
     , base >=4.7 && <5
     , bifunctors
     , foldl
-    , generic-lens
+    , generic-lens >= 1.2 && < 2.0
     , lucid
     , lucid-svg
     , lens
-    , numhask-space
+    , numhask-space >= 0.4 && < 0.5
     , pretty-simple
-    , protolude
+    , protolude >= 0.3 && < 0.4
     , scientific
     , tagsoup
     , text
     , text-format
     , time
     , transformers
-    , web-rep
+    , web-rep >= 0.5 && < 0.6
   default-language: Haskell2010
 
 executable examples
@@ -69,14 +69,14 @@
     , chart-svg
     , lens
     , javascript-bridge
-    , numhask-space
-    , protolude
+    , numhask-space >= 0.4 && < 0.5
+    , protolude >= 0.3 && < 0.4
     , scotty
     , text
     , transformers
     , unordered-containers
     , wai-middleware-static
-    , web-rep
+    , web-rep >= 0.5 && < 0.6
   default-language: Haskell2010
 
 executable venn
@@ -89,17 +89,17 @@
     , bifunctors
     , containers
     , chart-svg
-    , generic-lens
+    , generic-lens >= 1.2 && < 2.0
     , lucid-svg
     , lens
     , javascript-bridge
-    , numhask-space
-    , protolude
+    , numhask-space >= 0.4 && < 0.5
+    , protolude >= 0.3 && < 0.4
     , scotty
     , text
     , transformers
     , unordered-containers
     , wai-middleware-static
-    , web-rep
+    , web-rep >= 0.5 && < 0.6
   default-language: Haskell2010
 
diff --git a/stack.yaml b/stack.yaml
--- a/stack.yaml
+++ b/stack.yaml
@@ -1,14 +1,17 @@
-resolver: lts-15.6
+resolver: lts-15.13
 
 packages:
   - .
 
 extra-deps:
-  - box-0.3.0
+  - protolude-0.3.0
+  - box-0.4.0
+  - numhask-space-0.4.0
+  - web-rep-0.5.0
+  # external non-stack libraries
+  - generic-lens-1.2.0.1
+  - Color-0.1.4
   - interpolatedstring-perl6-1.0.2
   - javascript-bridge-0.2.0
   - lucid-svg-0.7.1
-  - numhask-space-0.3.1
-  - tdigest-0.2.1
   - text-format-0.3.2
-  - web-rep-0.4.0