diff --git a/aws-cloudfront-signed-cookies.cabal b/aws-cloudfront-signed-cookies.cabal
--- a/aws-cloudfront-signed-cookies.cabal
+++ b/aws-cloudfront-signed-cookies.cabal
@@ -1,5 +1,7 @@
+cabal-version: 2.2
+
 name: aws-cloudfront-signed-cookies
-version: 0.2.0.6
+version: 0.2.0.8
 
 synopsis: Generate signed cookies for AWS CloudFront
 category: Network, AWS, Cloud
@@ -12,14 +14,19 @@
 author:     Chris Martin
 maintainer: Chris Martin, Julie Moronuki
 
-copyright: 2018 Typeclass Consulting, LLC
+copyright: 2021 Mission Valley Software LLC
 license: MIT
 license-file: license.txt
 
 build-type: Simple
-cabal-version: >= 1.10
 
-tested-with: GHC == 8.10.1, GHC==8.8.1, GHC==8.6.3, GHC==8.4.4, GHC==8.2.2
+tested-with:
+    GHC == 9.0.1
+  , GHC == 8.10.1
+  , GHC == 8.8.1
+  , GHC == 8.6.3
+  , GHC == 8.4.4
+  , GHC == 8.2.2
 
 extra-source-files:
     readme.md
@@ -49,31 +56,61 @@
 
   build-depends:
       aeson
+           ^>= 1.4
+        || ^>= 1.5
     , aeson-pretty
+           ^>= 0.8
     , asn1-encoding
+           ^>= 0.9.5
     , asn1-types
+           ^>= 0.3.2
     , base
+           ^>= 4.10
+        || ^>= 4.11
+        || ^>= 4.12
+        || ^>= 4.13
+        || ^>= 4.14
+        || ^>= 4.15
     , base64-bytestring
+           ^>= 1.0.0.2
+        || ^>= 1.1
+        || ^>= 1.2
     , bytestring
+           ^>= 0.10.8.1
+        || ^>= 0.11
     , cookie
+           ^>= 0.4.3
     , cryptonite
+           ^>= 0.25
+        || ^>= 0.26
+        || ^>= 0.27
+        || ^>= 0.28
+        || ^>= 0.29
     , lens
+           ^>= 4.15.2
+        || ^>= 4.16
+        || ^>= 4.17
+        || ^>= 4.18
+        || ^>= 4.19
+        || ^>= 5
     , lens-aeson
+           ^>= 1.0.2
+        || ^>= 1.1
     , optparse-applicative
+           ^>= 0.14.1.0
+        || ^>= 0.15
+        || ^>= 0.16
     , pem
+           ^>= 0.2.3
     , text
+           ^>= 1.2.3
     , time
+           ^>= 1.8
+        || ^>= 1.9
     , unordered-containers
+           ^>= 0.2.10
     , vector
-
-  -- the introduction of Data.Time.Clock.nominalDay
-  build-depends: time >= 1.8
-
-  -- corresponds to ghc 8.0, which introduced TypeApplications
-  build-depends: base >= 4.9
-
-  -- untested
-  build-depends: base < 4.15
+           ^>= 0.12.0.1
 
 executable aws-cloudfront-signed-cookies
   default-language: Haskell2010
@@ -82,7 +119,13 @@
 
   build-depends:
       aws-cloudfront-signed-cookies
-    , base >= 4.9 && < 4.15
+    , base
+           ^>= 4.10
+        || ^>= 4.11
+        || ^>= 4.12
+        || ^>= 4.13
+        || ^>= 4.14
+        || ^>= 4.15
 
 test-suite hedgehog
   default-language: Haskell2010
@@ -92,6 +135,17 @@
   ghc-options: -threaded
   build-depends:
       aws-cloudfront-signed-cookies
-    , base >= 4.9 && < 4.15
+    , base
+           ^>= 4.10
+        || ^>= 4.11
+        || ^>= 4.12
+        || ^>= 4.13
+        || ^>= 4.14
+        || ^>= 4.15
     , hedgehog
+           ^>= 0.6
+        || ^>= 1.0
     , neat-interpolation
+           ^>= 0.3.2
+        || ^>= 0.4
+        || ^>= 0.5
diff --git a/changelog.md b/changelog.md
--- a/changelog.md
+++ b/changelog.md
@@ -22,3 +22,7 @@
 
 - Support GHC 8.10
 
+## 0.2.0.8 - ?
+
+- Add proper version bounds for all dependencies
+- Support GHC 9.0
diff --git a/executables/aws-cloudfront-signed-cookies.hs b/executables/aws-cloudfront-signed-cookies.hs
--- a/executables/aws-cloudfront-signed-cookies.hs
+++ b/executables/aws-cloudfront-signed-cookies.hs
@@ -1,3 +1,6 @@
 module Main (main) where
 
-import Network.AWS.CloudFront.SignedCookies.CLI (main)
+import qualified Network.AWS.CloudFront.SignedCookies.CLI
+
+main :: IO ()
+main = Network.AWS.CloudFront.SignedCookies.CLI.main
diff --git a/license.txt b/license.txt
--- a/license.txt
+++ b/license.txt
@@ -1,4 +1,4 @@
-Copyright 2018 Typeclass Consulting, LLC
+Copyright 2021 Mission Valley Software LLC
 
 Permission is hereby granted, free of charge, to any person obtaining a copy of
 this software and associated documentation files (the "Software"), to deal in