diff --git a/src/Handler/Package/Api.hs b/src/Handler/Package/Api.hs
index cb8f948..7804b86 100644
--- a/src/Handler/Package/Api.hs
+++ b/src/Handler/Package/Api.hs
@@ -25,8 +25,10 @@ import Startlude (
     (&),
     (.),
     (<$>),
+    UTCTime,
  )
 import Yesod
+import Data.Time.Format.ISO8601 (iso8601Show)
 
 
 dataUrl :: (ContentType, ByteString) -> Text
@@ -48,6 +50,7 @@ data PackageRes = PackageRes
     , packageResLicense :: !Text
     , packageResVersions :: !(NonEmpty Version)
     , packageResDependencies :: !(HashMap PkgId DependencyRes)
+    , packageResPublishedAt :: !UTCTime
     }
     deriving (Show, Generic)
 
@@ -66,6 +69,7 @@ instance ApiResponse PackageRes where
             , "categories" .= packageResCategories
             , "versions" .= packageResVersions
             , "dependency-metadata" .= (apiEncode v <$> packageResDependencies)
+            , "published-at" .= (iso8601Show packageResPublishedAt)
             ]
 
 
diff --git a/src/Handler/Package/V1/Index.hs b/src/Handler/Package/V1/Index.hs
index ef42c8c..44ad549 100644
--- a/src/Handler/Package/V1/Index.hs
+++ b/src/Handler/Package/V1/Index.hs
@@ -81,6 +81,7 @@ import Startlude (
     (<&>),
     (<>),
     (=<<),
+    liftA2,
  )
 import UnliftIO (Concurrently (..), mapConcurrently)
 import Yesod (
@@ -92,6 +93,7 @@ import Yesod (
     sendResponseStatus,
  )
 import Yesod.Core (logWarn)
+import Data.List.NonEmpty (head)
 
 
 data PackageReq = PackageReq
@@ -230,6 +232,7 @@ constructPackageListApiRes PackageMetadata{..} dependencies = do
             , packageResLicense = basicRender $ LicenseR V0 pkgId
             , packageResVersions = versionRecordNumber <$> pkgVersions
             , packageResDependencies = dependencies
+            , packageResPublishedAt = ((liftA2 fromMaybe) versionRecordCreatedAt versionRecordUpdatedAt) (head pkgVersions)
             }