diff --git a/changelog.d/1477 b/changelog.d/1477
new file mode 100644
index 00000000..52432378
--- /dev/null
+++ b/changelog.d/1477
@@ -0,0 +1,9 @@
+synopsis: Enable FlexibleContexts in Servant.API.ContentTypes
+prs: #1477
+
+description: {
+
+Starting with GHC 9.2, UndecidableInstances no longer implies FlexibleContexts.
+Add this extension where it's needed to make compilation succeed.
+
+}
diff --git a/servant/src/Servant/API/ContentTypes.hs b/servant/src/Servant/API/ContentTypes.hs
index 1706a047..10e8d896 100644
--- a/servant/src/Servant/API/ContentTypes.hs
+++ b/servant/src/Servant/API/ContentTypes.hs
@@ -2,6 +2,7 @@
 {-# LANGUAGE DataKinds             #-}
 {-# LANGUAGE DeriveDataTypeable    #-}
 {-# LANGUAGE DeriveGeneric         #-}
+{-# LANGUAGE FlexibleContexts      #-}
 {-# LANGUAGE FlexibleInstances     #-}
 {-# LANGUAGE MultiParamTypeClasses #-}
 {-# LANGUAGE OverloadedStrings     #-}