diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## [v1.4.2.3](https://github.com/diagrams/diagrams-lib/tree/v1.4.2.2) (2018-06-11)
+
+- Bug fix for `extrudeEnvelope` and friends ([#316](https://github.com/diagrams/diagrams-lib/issues/316))
+
 ## [v1.4.2.2](https://github.com/diagrams/diagrams-lib/tree/v1.4.2.2) (2018-05-08)
 
 - Fixes for GHC < 8.0
diff --git a/diagrams-lib.cabal b/diagrams-lib.cabal
--- a/diagrams-lib.cabal
+++ b/diagrams-lib.cabal
@@ -1,5 +1,5 @@
 Name:                diagrams-lib
-Version:             1.4.2.2
+Version:             1.4.2.3
 Synopsis:            Embedded domain-specific language for declarative graphics
 Description:         Diagrams is a flexible, extensible EDSL for creating
                      graphics of many types.  Graphics can be created
@@ -104,7 +104,7 @@
                        containers >= 0.3 && < 0.6,
                        array >= 0.3 && < 0.6,
                        semigroups >= 0.3.4 && < 0.19,
-                       monoid-extras >= 0.3 && < 0.5,
+                       monoid-extras >= 0.3 && < 0.6,
                        dual-tree >= 0.2 && < 0.3,
                        diagrams-core >= 1.4 && < 1.5,
                        diagrams-solve >= 0.1 && < 0.2,
@@ -123,7 +123,7 @@
                        adjunctions >= 4.0 && < 5.0,
                        distributive >=0.2.2 && < 1.0,
                        process >= 1.1 && < 1.7,
-                       fsnotify >= 0.2.1 && < 0.3,
+                       fsnotify >= 0.2.1 && < 0.4,
                        directory >= 1.2 && < 1.4,
                        unordered-containers >= 0.2 && < 0.3,
                        text >= 0.7.1 && < 1.3,
@@ -158,7 +158,7 @@
                , Instances
   hs-source-dirs: test
   build-depends:       base,
-                       tasty >= 0.10 && < 1.1,
+                       tasty >= 0.10 && < 1.2,
                        tasty-hunit >= 0.9.2 && < 0.11,
                        tasty-quickcheck >= 0.8 && < 0.11,
                        deepseq >= 1.3 && < 1.5,
diff --git a/src/Diagrams/Combinators.hs b/src/Diagrams/Combinators.hs
--- a/src/Diagrams/Combinators.hs
+++ b/src/Diagrams/Combinators.hs
@@ -145,7 +145,7 @@
 extrudeEnvelope
   :: (Metric v, OrderedField n, Monoid' m)
   => v n -> QDiagram b v n m -> QDiagram b v n m
-extrudeEnvelope = deformEnvelope 0.5
+extrudeEnvelope = deformEnvelope 1
 
 -- | @intrudeEnvelope v d@ asymmetrically \"intrudes\" the envelope of
 --   a diagram away from the given direction.  All parts of the envelope
@@ -157,7 +157,7 @@
 intrudeEnvelope
   :: (Metric v, OrderedField n, Monoid' m)
   => v n -> QDiagram b v n m -> QDiagram b v n m
-intrudeEnvelope = deformEnvelope (-0.5)
+intrudeEnvelope = deformEnvelope (-1)
 
 -- Utility for extrudeEnvelope / intrudeEnvelope
 deformEnvelope
@@ -167,7 +167,7 @@
   where
     deformE = Option . fmap deformE' . getOption
     deformE' env v'
-        | dp > 0 = Max $ getMax (env v') + (dp * s) / norm v'
+        | dp > 0    = Max $ getMax (env v') + (dp * s) / quadrance v'
         | otherwise = env v'
       where
         dp = v' `dot` v