diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,5 +1,9 @@
 # Changelog for http-client-tls
 
+## 0.3.6.4
+
+* data-default-class -> data-default [#546](https://github.com/snoyberg/http-client/pull/546/files)
+
 ## 0.3.6.3
 
 * catching up to tls 1.8.0 [#515](https://github.com/snoyberg/http-client/pull/515)
diff --git a/Network/HTTP/Client/TLS.hs b/Network/HTTP/Client/TLS.hs
--- a/Network/HTTP/Client/TLS.hs
+++ b/Network/HTTP/Client/TLS.hs
@@ -26,7 +26,7 @@
 import Control.Applicative ((<|>))
 import Control.Arrow (first)
 import System.Environment (getEnvironment)
-import Data.Default.Class
+import Data.Default
 import Network.HTTP.Client hiding (host, port)
 import Network.HTTP.Client.Internal hiding (host, port)
 import Control.Exception
diff --git a/http-client-tls.cabal b/http-client-tls.cabal
--- a/http-client-tls.cabal
+++ b/http-client-tls.cabal
@@ -1,5 +1,5 @@
 name:                http-client-tls
-version:             0.3.6.3
+version:             0.3.6.4
 synopsis:            http-client backend using the connection package and tls library
 description:         Hackage documentation generation is not reliable. For up to date documentation, please see: <https://www.stackage.org/package/http-client-tls>.
 homepage:            https://github.com/snoyberg/http-client
@@ -17,7 +17,7 @@
   exposed-modules:     Network.HTTP.Client.TLS
   other-extensions:    ScopedTypeVariables
   build-depends:       base >= 4.10 && < 5
-                     , data-default-class
+                     , data-default
                      , http-client >= 0.7.11
                      , crypton-connection
                      , network