diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+# Version [0.4.0.1](https://github.com/blockfrost/blockfrost-haskell/compare/v0.4.0.0...v0.4.0.1) (2022-04-05)
+
+* Allow servant `0.19`
+
 # Version [0.4.0.0](https://github.com/blockfrost/blockfrost-haskell/compare/v0.3.1.0...v0.4.0.0) (2022-03-09)
 
 * Changes
diff --git a/blockfrost-api.cabal b/blockfrost-api.cabal
--- a/blockfrost-api.cabal
+++ b/blockfrost-api.cabal
@@ -1,6 +1,6 @@
 cabal-version:       2.2
 name:                blockfrost-api
-version:             0.4.0.0
+version:             0.4.0.1
 synopsis:            API definitions for blockfrost.io
 description:         Core types and Servant API description
 homepage:            https://github.com/blockfrost/blockfrost-haskell
@@ -119,19 +119,19 @@
                       , Blockfrost.Util.UserAgent
                       , Paths_blockfrost_api
    autogen-modules:     Paths_blockfrost_api
-   build-depends:       base >= 4.7 && < 5
+   build-depends:       base                     >= 4.7 && < 5
                       , bytestring
                       , data-default-class
                       , text
                       , time
                       , aeson
                       , deriving-aeson
-                      , lens
+                      , lens                     >= 5.0 && < 5.1
                       , template-haskell
-                      , servant                  ^>= 0.18
+                      , servant                  >= 0.18 && < 0.20
                       , servant-docs
                       , servant-multipart-api
-                      , safe-money
+                      , safe-money               >= 0.9 && < 0.10
                       , quickcheck-instances
                       , QuickCheck
                       , vector