diff --git a/changelog.md b/changelog.md
--- a/changelog.md
+++ b/changelog.md
@@ -10,3 +10,9 @@
 ## 1.0.0.0 - 2018-12-20
 
 - Initial release
+
+## 1.0.1.0 - 2019-09-30
+
+New:
+
+  - Functions `get'`, `post'`, `delete'` with a new `RequestApiVersion` parameter.
diff --git a/library/Stripe/Wreq.hs b/library/Stripe/Wreq.hs
--- a/library/Stripe/Wreq.hs
+++ b/library/Stripe/Wreq.hs
@@ -1,4 +1,4 @@
-{-# OPTIONS_GHC -Wall #-}
+{-# OPTIONS_GHC -Wall -fno-warn-missing-signatures #-}
 
 {- | Typical use of this module:
 
@@ -11,11 +11,11 @@
   (
   -- * Request
   -- ** GET
-    get, Get (..)
+    get, get', Get (..)
   -- ** POST
-  , post, Post (..)
+  , post, post', Post (..)
   -- ** DELETE
-  , delete, Delete (..)
+  , delete, delete', Delete (..)
 
   -- * Response
   , WreqResponse, Response (..)
@@ -47,6 +47,7 @@
 import           Control.Monad     ((>=>))
 import qualified Data.Bifunctor
 import qualified Data.Semigroup
+import           Data.String       (fromString)
 import           Prelude           hiding (userError)
 
 -- bytestring
@@ -54,10 +55,10 @@
 import qualified Data.ByteString.Lazy
 
 -- lens
-import Control.Lens ((&), (.~), (?~), (^.))
+import Control.Lens ((&), (.~), (?~), (^.), (<>~))
 
 -- stripe-concepts
-import Stripe.Concepts (ApiSecretKey (..))
+import Stripe.Concepts (ApiSecretKey (..), RequestApiVersion (..), ApiVersion (..))
 
 -- text
 import           Data.Text (Text)
@@ -182,25 +183,37 @@
     }
 
 get :: Session -> ApiSecretKey -> Get -> IO WreqResponse
-get session key x = Network.Wreq.Session.getWith opts session url
+get session key x = get' session key DefaultApiVersion x
+
+get' :: Session -> ApiSecretKey -> RequestApiVersion -> Get -> IO WreqResponse
+get' session key v x = Network.Wreq.Session.getWith opts session url
   where
     url = makeUrl (getPath x)
     opts = wreqDefaults & Network.Wreq.auth ?~ auth key
                         & Network.Wreq.params .~ (getParams x)
+                        & Network.Wreq.headers <>~ (requestApiVersionHeaders v)
 
 post :: Session -> ApiSecretKey -> Post -> IO WreqResponse
-post session key x = Network.Wreq.Session.postWith opts session url params
+post session key x = post' session key DefaultApiVersion x
+
+post' :: Session -> ApiSecretKey -> RequestApiVersion -> Post -> IO WreqResponse
+post' session key v x = Network.Wreq.Session.postWith opts session url params
   where
     url = makeUrl (postPath x)
     params = postParams x
     opts = wreqDefaults & Network.Wreq.auth ?~ auth key
+                        & Network.Wreq.headers <>~ (requestApiVersionHeaders v)
 
 delete :: Session -> ApiSecretKey -> Delete -> IO WreqResponse
-delete session key x = Network.Wreq.Session.deleteWith opts session url
+delete session key x = delete' session key DefaultApiVersion x
+
+delete' :: Session -> ApiSecretKey -> RequestApiVersion -> Delete -> IO WreqResponse
+delete' session key v x = Network.Wreq.Session.deleteWith opts session url
   where
     url = makeUrl (deletePath x)
     opts = wreqDefaults & Network.Wreq.auth ?~ auth key
                         & Network.Wreq.params .~ (deleteParams x)
+                        & Network.Wreq.headers <>~ (requestApiVersionHeaders v)
 
 urlBase :: Text
 urlBase = Data.Text.pack "https://api.stripe.com/v1"
@@ -213,6 +226,18 @@
 
 wreqDefaults :: Network.Wreq.Options
 wreqDefaults = Network.Wreq.defaults & noCheckResponse
+
+-- When using the default API version, no header is required.
+requestApiVersionHeaders DefaultApiVersion = []
+
+-- Overriding with a specific API version requires one header field.
+requestApiVersionHeaders (OverrideApiVersion v) = [apiVersionHeader v]
+
+-- The header field for specifying the API version.
+apiVersionHeader (ApiVersion v) = (name, value)
+  where
+    name = fromString "Stripe-Version"
+    value = fromString (Data.Text.unpack v)
 
 {- | Set a "response checker" that overrides Wreq's default one which causes
 exceptions to be thrown for non-2xx HTTP status codes -}
diff --git a/license.txt b/license.txt
--- a/license.txt
+++ b/license.txt
@@ -1,4 +1,4 @@
-Copyright 2018 Typeclass Consulting, LLC
+Copyright 2019 Typeclass Consulting, 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
diff --git a/stripe-wreq.cabal b/stripe-wreq.cabal
--- a/stripe-wreq.cabal
+++ b/stripe-wreq.cabal
@@ -1,5 +1,5 @@
 name: stripe-wreq
-version: 1.0.0.0
+version: 1.0.1.0
 
 synopsis: Use the Stripe API via Wreq
 category: Web
@@ -19,13 +19,13 @@
 author:     Chris Martin
 maintainer: Chris Martin, Julie Moronuki
 
-copyright: 2018 Typeclass Consulting, LLC
+copyright: 2019 Typeclass Consulting, LLC
 license: MIT
 license-file: license.txt
 
 build-type: Simple
 cabal-version: >=1.10
-tested-with: GHC==8.2.2, GHC==8.4.3, GHC==8.6.1
+tested-with: GHC==8.2.2, GHC==8.4.4, GHC==8.6.3
 
 extra-source-files:
     changelog.md