diff --git a/diagrams-postscript.cabal b/diagrams-postscript.cabal
--- a/diagrams-postscript.cabal
+++ b/diagrams-postscript.cabal
@@ -1,5 +1,5 @@
 Name:                diagrams-postscript
-Version:             1.5
+Version:             1.5.1
 Synopsis:            Postscript backend for diagrams drawing EDSL
 Description:         This package provides a modular backend for rendering
                      diagrams created with the diagrams EDSL using Postscript.
@@ -14,7 +14,7 @@
                      .
                      * "Diagrams.Backend.CMYK" - Special support for CMYK
                      color attributes.
-Homepage:            http://projects.haskell.org/diagrams/
+Homepage:            https://diagrams.github.io/
 License:             BSD3
 License-file:        LICENSE
 Author:              Ryan Yates
@@ -23,7 +23,7 @@
 Category:            Graphics
 Build-type:          Simple
 Cabal-version:       1.18
-Tested-with:         GHC ==8.0.2 || ==8.2.2 || ==8.4.3 || ==8.6.5 || ==8.8.1
+Tested-with:         GHC ==8.4.4 || ==8.6.5 || ==8.8.4 || ==8.10.4 || ==9.0.1 || ==9.2.1
 Source-repository head
   type:     git
   location: https://github.com/diagrams/diagrams-postscript.git
@@ -34,18 +34,18 @@
                        Diagrams.Backend.Postscript.CmdLine
                        Graphics.Rendering.Postscript
   Hs-source-dirs:      src
-  Build-depends:       base >= 4.8 && < 4.14,
-                       bytestring >= 0.9 && <0.11,
+  Build-depends:       base >= 4.8 && < 4.17,
+                       bytestring >= 0.9 && <0.12,
                        mtl >= 2.0 && < 2.3,
-                       diagrams-core >= 1.3 && < 1.5,
+                       diagrams-core >= 1.3 && < 1.6,
                        diagrams-lib >= 1.3 && < 1.5,
                        data-default-class < 0.2,
                        statestack >= 0.2 && < 0.4,
                        split >= 0.1.2 && < 0.3,
-                       monoid-extras >= 0.3 && < 0.6,
-                       semigroups >= 0.3.4 && < 0.20,
-                       lens >= 4.0 && < 4.19,
+                       monoid-extras >= 0.3 && < 0.7,
+                       semigroups >= 0.3.4 && < 0.21,
+                       lens >= 4.0 && < 5.2,
                        containers >= 0.3 && < 0.7,
-                       hashable >= 1.1 && < 1.4
+                       hashable >= 1.1 && < 1.5
 
   default-language:    Haskell2010
diff --git a/src/Diagrams/Backend/Postscript.hs b/src/Diagrams/Backend/Postscript.hs
--- a/src/Diagrams/Backend/Postscript.hs
+++ b/src/Diagrams/Backend/Postscript.hs
@@ -141,7 +141,7 @@
           , _psSizeSpec     :: SizeSpec V2 Double   -- ^ the requested size of the output
           , _psOutputFormat :: OutputFormat -- ^ the output format and associated options
           }
-    deriving (Show)
+    deriving (Show, Eq)
 
   renderRTree _ opts t =
     let surfaceF surface = fst (C.renderBuilder surface r)
diff --git a/src/Diagrams/Backend/Postscript/CmdLine.hs b/src/Diagrams/Backend/Postscript/CmdLine.hs
--- a/src/Diagrams/Backend/Postscript/CmdLine.hs
+++ b/src/Diagrams/Backend/Postscript/CmdLine.hs
@@ -47,7 +47,7 @@
 --   "Diagrams.Backend.Postscript" for more information.
 --
 -- For a tutorial on command-line diagram creation see
--- <http://projects.haskell.org/diagrams/doc/cmdline.html>.
+-- <https://diagrams.github.io/doc/cmdline.html>.
 --
 -----------------------------------------------------------------------------