diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,15 @@
 # Revision history for servant-event-stream
 
+## 0.3.2.0 -- 2026-02-23
+
+* Support GHC 8.6 through 9.12 (base 4.12 to 4.21).
+* Remove redundant `Typeable` deriving to fix `-Wderiving-typeable` warning on GHC 9.12+.
+* Add CI test matrix for GHC 8.6, 8.10, 9.2, 9.8, 9.12.
+
+## 0.3.1.1 -- 2026-02-23
+
+* Constrain base bounds in test suite to match library.
+
 ## 0.3.1.0 -- 2025-08-21
 
 * Qualify `servant` imports so that `ServerSentEvents` added in `servant-0.20.3.0` does not conflict with ours. (Issue #12)
diff --git a/servant-event-stream.cabal b/servant-event-stream.cabal
--- a/servant-event-stream.cabal
+++ b/servant-event-stream.cabal
@@ -1,6 +1,6 @@
 cabal-version: >=1.10
 name: servant-event-stream
-version: 0.3.1.0
+version: 0.3.2.0
 stability: alpha
 synopsis: Servant support for Server-Sent events
 category: Servant, Web
@@ -14,7 +14,8 @@
 license-file: LICENSE
 author: Shaun Sharples
 maintainer: shaun.sharples@gmail.com
-copyright: (c) 2025 Shaun Sharples
+copyright: (c) 2026 Shaun Sharples
+tested-with: GHC == 8.6.5, GHC == 8.10.7, GHC == 9.2.8, GHC == 9.8.4, GHC == 9.12.2
 build-type: Simple
 extra-source-files:
   CHANGELOG.md
@@ -31,7 +32,7 @@
     OverloadedStrings
 
   build-depends:
-    base >=4.10 && <4.22,
+    base >=4.12 && <4.22,
     bytestring >=0.11.1.0 && <0.13,
     http-media >=0.7.1.3 && <0.9,
     lens >=4.17 && <5.4,
@@ -42,10 +43,12 @@
   hs-source-dirs: src
   default-language: Haskell2010
   ghc-options: -Wall
+  if impl(ghc < 9.4)
+    ghc-options: -Wno-unticked-promoted-constructors
 
 test-suite tests-default
   type: exitcode-stdio-1.0
   main-is: Spec.hs
   hs-source-dirs: tests
   default-language: Haskell2010
-  build-depends: base >=4.10 && <4.22
+  build-depends: base >=4.12 && <4.22
diff --git a/src/Servant/API/EventStream.hs b/src/Servant/API/EventStream.hs
--- a/src/Servant/API/EventStream.hs
+++ b/src/Servant/API/EventStream.hs
@@ -12,7 +12,7 @@
 {- |
 Module: Servant.API.EventStream
 Description: Server Sent Events for Servant Streams
-Copyright: (c) 2024 Shaun Sharples
+Copyright: (c) 2026 Shaun Sharples
 License: BSD3
 Stability: alpha
 -}
@@ -65,7 +65,6 @@
 import Data.Semigroup
 #endif
 import Data.Text (Text)
-import Data.Typeable (Typeable)
 import GHC.Generics (Generic)
 import Network.HTTP.Media ((//), (/:))
 import qualified Servant as S
@@ -76,7 +75,7 @@
   <https://developer.mozilla.org/en-US/docs/Web/API/Server-sent_events/Using_server-sent_events#event_stream_format>
 -}
 data ServerSentEvents (a :: Type)
-  deriving (Typeable, Generic)
+  deriving (Generic)
 
 instance S.HasLink (ServerSentEvents a) where
   type MkLink (ServerSentEvents a) r = r