diff --git a/go.mod b/go.mod
index 3e8eb23..ac8916f 100644
--- a/go.mod
+++ b/go.mod
@@ -19,6 +19,7 @@ require (
 	github.com/google/go-cmp v0.5.9 // indirect
 	github.com/gorilla/websocket v1.5.0 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/shopspring/decimal v1.3.1 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
 
diff --git a/go.sum b/go.sum
index 3a92e1e..620ccda 100644
--- a/go.sum
+++ b/go.sum
@@ -118,6 +118,8 @@ github.com/rogpeppe/go-internal v1.8.0/go.mod h1:WmiCO8CzOY8rg0OYDC4/i/2WRWAB6po
 github.com/sclevine/agouti v3.0.0+incompatible/go.mod h1:b4WX9W9L1sfQKXeJf1mUTLZKJ48R1S7H23Ji7oFO5Bw=
 github.com/sergi/go-diff v1.1.0 h1:we8PVUC3FE2uYfodKH/nBHMSetSfHDR6scGdBi+erh0=
 github.com/sergi/go-diff v1.1.0/go.mod h1:STckp+ISIX8hZLjrqAeVduY0gWCT9IjLuqbuNXdaHfM=
+github.com/shopspring/decimal v1.3.1 h1:2Usl1nmF/WZucqkFZhnfFYxxxu8LG21F6nPQBE5gKV8=
+github.com/shopspring/decimal v1.3.1/go.mod h1:DKyhrW/HYNuLGql+MJL6WCR6knT2jwCFRcu2hWCYk4o=
 github.com/smartystreets/assertions v0.0.0-20180927180507-b2de0cb4f26d h1:zE9ykElWQ6/NYmHa3jpm/yHnI4xSofP+UP6SpjHcSeM=
 github.com/smartystreets/assertions v0.0.0-20180927180507-b2de0cb4f26d/go.mod h1:OnSkiWE9lh6wB0YB77sQom3nweQdgAjqCqsofrRNTgc=
 github.com/smartystreets/goconvey v1.6.4 h1:fv0U8FUIMPNf1L9lnHLvLhgicrIVChEkdzIKYqbNC9s=
diff --git a/go/client_test.go b/go/client_test.go
index 39926b8..29f97e9 100644
--- a/go/client_test.go
+++ b/go/client_test.go
@@ -10,6 +10,7 @@ import (
 	wheretopark "wheretopark/go"
 
 	geojson "github.com/paulmach/go.geojson"
+	"github.com/shopspring/decimal"
 	"github.com/stretchr/testify/assert"
 )
 
@@ -95,23 +96,23 @@ func TestParkingLot(t *testing.T) {
 				Pricing: []wheretopark.PricingRule{
 					{
 						Duration: "PT1H",
-						Price:    0.0,
+						Price:    decimal.Zero,
 					},
 					{
 						Duration: "PT2H",
-						Price:    2.0,
+						Price:    decimal.NewFromInt(2),
 					},
 					{
 						Duration: "PT3H",
-						Price:    3.0,
+						Price:    decimal.NewFromInt(3),
 					},
 					{
 						Duration: "PT24H",
-						Price:    25.0,
+						Price:    decimal.NewFromInt(25),
 					},
 					{
 						Duration:  "PT1H",
-						Price:     4.0,
+						Price:     decimal.NewFromInt(4),
 						Repeating: true,
 					},
 				},
diff --git a/go/parking_lot.go b/go/parking_lot.go
index cb6b301..81dc193 100644
--- a/go/parking_lot.go
+++ b/go/parking_lot.go
@@ -3,6 +3,7 @@ package wheretopark
 import (
 	"github.com/mmcloughlin/geohash"
 	geojson "github.com/paulmach/go.geojson"
+	"github.com/shopspring/decimal"
 )
 
 type ID = string
@@ -12,9 +13,9 @@ type PaymentMethod = string
 type LanguageCode = string
 
 type PricingRule struct {
-	Duration  string  `json:"duration"`
-	Price     float32 `json:"price"`
-	Repeating bool    `json:"repeating,omitempty"`
+	Duration  string          `json:"duration"`
+	Price     decimal.Decimal `json:"price"`
+	Repeating bool            `json:"repeating,omitempty"`
 }
 
 type Rule struct {