diff --git a/diagrams-pgf.cabal b/diagrams-pgf.cabal
index 34e6870..c03182f 100644
--- a/diagrams-pgf.cabal
+++ b/diagrams-pgf.cabal
@@ -41,7 +41,7 @@ Library
                      , directory            >= 1.0   && < 1.4
                      , filepath             >= 1.2   && < 1.4
                      , hashable             >= 1.1   && < 1.3
-                     , lens                 >= 3.8   && < 4.6
+                     , lens                 >= 3.8   && < 4.7
                      , mtl                  >= 2.1   && < 3.0
                      , optparse-applicative >= 0.11  && < 0.12
                      , process              >= 1.0   && < 1.3
diff --git a/src/Diagrams/Backend/PGF/Render.hs b/src/Diagrams/Backend/PGF/Render.hs
index 6e0bdf0..2a8420f 100755
--- a/src/Diagrams/Backend/PGF/Render.hs
+++ b/src/Diagrams/Backend/PGF/Render.hs
@@ -87,13 +87,13 @@ toRender (Node (RAnnot (OpacityGroup x)) rs)
 toRender (Node _ rs)            = foldMap toRender rs
 
 
-renderP :: (Renderable a PGF, Vn a ~ V2 n) => a -> P.Render n
+renderP :: (Renderable a PGF, V a ~ V2, N a ~ n) => a -> P.Render n
 renderP (render PGF -> R r) = r
 
 instance Fractional n => Default (Options PGF V2 n) where
   def = PGFOptions
           { _surface    = def
-          , _sizeSpec     = absolute
+          , _sizeSpec   = absolute
           , _readable   = True
           , _standalone = False
           }