diff --git a/spago.yaml b/spago.yaml
index 177f229..b717733 100644
--- a/spago.yaml
+++ b/spago.yaml
@@ -20,6 +20,7 @@ package:
     - "foreign-object"
     - "identity"
     - "integers"
+    - js-bigints
     - "js-date"
     - "lists"
     - "maybe"
diff --git a/src/Database/PostgreSQL/Value.purs b/src/Database/PostgreSQL/Value.purs
index dda7f4a..d6eb880 100644
--- a/src/Database/PostgreSQL/Value.purs
+++ b/src/Database/PostgreSQL/Value.purs
@@ -6,11 +6,10 @@ module Database.PostgreSQL.Value where
 
 import Prelude
 
-import Control.Monad.Error.Class (throwError)
+import Control.Monad.Error.Class (liftMaybe, throwError)
 import Control.Monad.Except (ExceptT, except, runExcept, runExceptT)
 import Data.Argonaut (Json)
 import Data.Argonaut (stringify) as Argonaut
-import Data.Foldable (foldl)
 import Data.Array as Array
 import Data.Bifunctor (lmap)
 import Data.ByteString (ByteString)
@@ -20,6 +19,7 @@ import Data.Decimal (Decimal)
 import Data.Decimal as Decimal
 import Data.Either (Either(..), note)
 import Data.Enum (fromEnum, toEnum)
+import Data.Foldable (foldl)
 import Data.Identity (Identity)
 import Data.Int (fromString)
 import Data.JSDate (JSDate)
@@ -34,6 +34,8 @@ import Data.Traversable (sequence, traverse)
 import Foreign (Foreign, ForeignError(..), MultipleErrors, isNull, readArray, readBoolean, readChar, readInt, readNumber, readString, renderForeignError, unsafeFromForeign, unsafeToForeign)
 import Foreign.Generic.Internal (readObject)
 import Foreign.Object (Object)
+import JS.BigInt (BigInt)
+import JS.BigInt as BigInt
 
 -- | Convert things to SQL values.
 class ToSQLValue a where
@@ -49,6 +51,13 @@ instance fromSQLValueBoolean :: FromSQLValue Boolean where
 else instance fromSQLValueChar :: FromSQLValue Char where
   fromSQLValue = lmap show <<< runExcept <<< readChar
 
+else instance fromSQLValueBigInt :: FromSQLValue BigInt where
+  fromSQLValue =
+    lmap show
+    <<< runExcept
+    <<< flip bind (\s -> liftMaybe (pure $ ForeignError $ "invalid bigint: " <> s) $ BigInt.fromString s)
+    <<< readString
+
 else instance fromSQLValueInt :: FromSQLValue Int where
   fromSQLValue = lmap show <<< runExcept <<< readInt
 
@@ -130,6 +139,9 @@ instance toSQLValueBoolean :: ToSQLValue Boolean where
 else instance toSQLValueChar :: ToSQLValue Char where
   toSQLValue = unsafeToForeign
 
+else instance toSQLValueBigInt :: ToSQLValue BigInt where
+  toSQLValue = unsafeToForeign <<< BigInt.toString
+
 else instance toSQLValueInt :: ToSQLValue Int where
   toSQLValue = unsafeToForeign
 
diff --git a/test/Main.purs b/test/Main.purs
index 7a8063d..55bd755 100644
--- a/test/Main.purs
+++ b/test/Main.purs
@@ -23,7 +23,7 @@ import Data.Newtype (unwrap)
 import Data.Number ((%))
 import Data.Tuple (Tuple(..))
 import Data.Tuple.Nested ((/\))
-import Database.PostgreSQL (Client, Configuration, Connection(..), PGConnectionURI, PGError(..), Pool, Query(Query), Row0(Row0), Row1(Row1), Row2(Row2), Row3(Row3), Row9(Row9), fromClient, fromPool, parseURI)
+import Database.PostgreSQL (Client, Configuration, Connection(..), PGConnectionURI, PGError(..), Pool, Query(Query), Row0(Row0), Row1(Row1), Row12(..), Row2(Row2), Row3(Row3), Row9(Row9), fromClient, fromPool, parseURI)
 import Database.PostgreSQL.PG (command, execute, onIntegrityError, query, scalar)
 import Database.PostgreSQL.PG (withClient, withClientTransaction) as PG
 import Database.PostgreSQL.Pool (new) as Pool
@@ -34,6 +34,8 @@ import Effect.Class (liftEffect)
 import Effect.Exception (message)
 import Foreign.Object (Object)
 import Foreign.Object (fromFoldable) as Object
+import JS.BigInt (BigInt)
+import JS.BigInt as BigInt
 import JS.Unsafe.Stringify (unsafeStringify)
 import Partial.Unsafe (unsafePartial)
 import Test.Assert (assert)
@@ -45,6 +47,9 @@ import Test.Unit as Test.Unit
 import Test.Unit.Assert (equal)
 import Test.Unit.Main (runTest)
 
+bigintFromString :: String -> BigInt
+bigintFromString = unsafePartial fromJust <<< BigInt.fromString
+
 withClient :: forall a. Pool -> (Client -> AppM a) -> AppM a
 withClient = PG.withClient runExceptT
 
@@ -124,6 +129,7 @@ main = do
                     delicious boolean NOT NULL,
                     price NUMERIC(4,2) NOT NULL,
                     added TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_TIMESTAMP,
+                    huge_number INT8 NULL,
                     PRIMARY KEY (name)
                   );
                   CREATE TEMPORARY TABLE dates (
@@ -263,20 +269,23 @@ main = do
                               execute handle
                                 ( Query
                                     """
-                                    INSERT INTO foods (name, delicious, price)
-                                    VALUES ($1, $2, $3), ($4, $5, $6), ($7, $8, $9)
+                                    INSERT INTO foods (name, delicious, price, huge_number)
+                                    VALUES ($1, $2, $3, $4), ($5, $6, $7, $8), ($9, $10, $11, $12)
                                     """
                                 )
-                                ( Row9
+                                ( Row12
                                     "pork"
                                     true
                                     (D.fromString "8.30")
+                                    (bigintFromString "123")
                                     "sauerkraut"
                                     false
                                     (D.fromString "3.30")
+                                    (bigintFromString "456")
                                     "rookworst"
                                     true
                                     (D.fromString "5.60")
+                                    (bigintFromString "789")
                                 )
                           test handle "select column subset"
                             $ do
@@ -358,6 +367,20 @@ main = do
                                     )
                                     Row0
                                 liftEffect <<< assert $ sauerkrautPrice == [ Row1 (D.fromString "3.30") ]
+                          test handle "handling bigint value"
+                            $ do
+                                insertFood
+                                hugeNumber <-
+                                  query handle
+                                    ( Query
+                                        """
+                                        SELECT huge_number
+                                        FROM foods
+                                        WHERE NOT delicious
+                                        """
+                                    )
+                                    Row0
+                                liftEffect <<< assert $ hugeNumber == [ Row1 (bigintFromString "456") ]
                           transactionTest "integrity error handling"
                             $ do
                                 withRollback client do