diff --git a/go.mod b/go.mod
index ea8840d7..a540c5f5 100644
--- a/go.mod
+++ b/go.mod
@@ -13,7 +13,6 @@ require (
 	github.com/jackc/pgservicefile v0.0.0-20200714003250-2b9c44734f2b
 	github.com/jackc/puddle v1.2.0
 	github.com/rs/zerolog v1.15.0
-	github.com/shopspring/decimal v1.2.0
 	github.com/sirupsen/logrus v1.4.2
 	github.com/stretchr/testify v1.7.0
 	go.uber.org/zap v1.13.0
diff --git a/go.sum b/go.sum
index 481a6947..0ac9ca50 100644
--- a/go.sum
+++ b/go.sum
@@ -88,8 +88,6 @@ github.com/rs/zerolog v1.15.0 h1:uPRuwkWF4J6fGsJ2R0Gn2jB1EQiav9k3S6CSdygQJXY=
 github.com/rs/zerolog v1.15.0/go.mod h1:xYTKnLHcpfU2225ny5qZjxnj9NvkumZYjJHlAThCjNc=
 github.com/satori/go.uuid v1.2.0/go.mod h1:dA0hQrYB0VpLJoorglMZABFdXlWrHn1NEOzdhQKdks0=
 github.com/shopspring/decimal v0.0.0-20180709203117-cd690d0c9e24/go.mod h1:M+9NzErvs504Cn4c5DxATwIqPbtswREoFCre64PpcG4=
-github.com/shopspring/decimal v1.2.0 h1:abSATXmQEYyShuxI4/vyW3tV1MrKAJzCZ/0zLUXYbsQ=
-github.com/shopspring/decimal v1.2.0/go.mod h1:DKyhrW/HYNuLGql+MJL6WCR6knT2jwCFRcu2hWCYk4o=
 github.com/sirupsen/logrus v1.4.1/go.mod h1:ni0Sbl8bgC9z8RoU9G6nDWqqs/fq4eDPysMBDgk/93Q=
 github.com/sirupsen/logrus v1.4.2 h1:SPIRibHv4MatM3XXNO2BJeFLZwZ2LvZgfQ5+UNI2im4=
 github.com/sirupsen/logrus v1.4.2/go.mod h1:tLMulIdttU9McNUspp0xgXVQah82FyeX6MwdIuYE2rE=
diff --git a/query_test.go b/query_test.go
index 71e05197..63040894 100644
--- a/query_test.go
+++ b/query_test.go
@@ -18,7 +18,6 @@ import (
 	"github.com/jackc/pgx/v5/pgconn"
 	"github.com/jackc/pgx/v5/pgconn/stmtcache"
 	"github.com/jackc/pgx/v5/pgtype"
-	"github.com/shopspring/decimal"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )
@@ -1154,55 +1153,37 @@ func TestReadingNullByteArrays(t *testing.T) {
 	}
 }
 
-// Use github.com/shopspring/decimal as real-world database/sql custom type
-// to test against.
 func TestConnQueryDatabaseSQLScanner(t *testing.T) {
 	t.Parallel()
 
 	conn := mustConnectString(t, os.Getenv("PGX_TEST_DATABASE"))
 	defer closeConn(t, conn)
 
-	var num decimal.Decimal
+	var num sql.NullFloat64
 
-	err := conn.QueryRow(context.Background(), "select '1234.567'::decimal").Scan(&num)
+	err := conn.QueryRow(context.Background(), "select '1234.567'::float8").Scan(&num)
 	if err != nil {
 		t.Fatalf("Scan failed: %v", err)
 	}
 
-	expected, err := decimal.NewFromString("1234.567")
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	if !num.Equals(expected) {
-		t.Errorf("Expected num to be %v, but it was %v", expected, num)
-	}
+	require.True(t, num.Valid)
+	require.Equal(t, 1234.567, num.Float64)
 
 	ensureConnValid(t, conn)
 }
 
-// Use github.com/shopspring/decimal as real-world database/sql custom type
-// to test against.
 func TestConnQueryDatabaseSQLDriverValuer(t *testing.T) {
 	t.Parallel()
 
 	conn := mustConnectString(t, os.Getenv("PGX_TEST_DATABASE"))
 	defer closeConn(t, conn)
 
-	expected, err := decimal.NewFromString("1234.567")
-	if err != nil {
-		t.Fatal(err)
-	}
-	var num decimal.Decimal
+	expected := sql.NullFloat64{Float64: 1234.567, Valid: true}
+	var actual sql.NullFloat64
 
-	err = conn.QueryRow(context.Background(), "select $1::decimal", &expected).Scan(&num)
-	if err != nil {
-		t.Fatalf("Scan failed: %v", err)
-	}
-
-	if !num.Equals(expected) {
-		t.Errorf("Expected num to be %v, but it was %v", expected, num)
-	}
+	err := conn.QueryRow(context.Background(), "select $1::float8", &expected).Scan(&actual)
+	require.NoError(t, err)
+	require.Equal(t, expected, actual)
 
 	ensureConnValid(t, conn)
 }