diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+## Inflections 0.4.0.6
+* Support `megaparsec` == 9.0
+
 ## Inflections 0.4.0.5
 * Support `megaparsec` == 8.0
 
diff --git a/inflections.cabal b/inflections.cabal
--- a/inflections.cabal
+++ b/inflections.cabal
@@ -1,5 +1,5 @@
 name:                inflections
-version:             0.4.0.5
+version:             0.4.0.6
 synopsis:            Inflections library for Haskell
 description:
   Inflections provides methods for singularization, pluralization,
@@ -49,7 +49,7 @@
     ghc-options:      -O2 -Wall
   build-depends:       base         >= 4.6   && < 5.0
                      , exceptions   >= 0.6   && < 0.11
-                     , megaparsec   >= 7.0.1 && < 9.0
+                     , megaparsec   >= 7.0.1 && < 10.0
                      , text         >= 0.2   && < 1.3
                      , unordered-containers >= 0.2.7 && < 0.3
   if !impl(ghc >= 7.10)