diff --git a/protocols/horizon/main.go b/protocols/horizon/main.go
index e6e6871ee7..74a955fb95 100644
--- a/protocols/horizon/main.go
+++ b/protocols/horizon/main.go
@@ -436,23 +436,17 @@ type Transaction struct {
 		// When TransactionSuccess is removed from the SDKs we can remove this HAL link
 		Transaction hal.Link `json:"transaction"`
 	} `json:"_links"`
-	ID              string    `json:"id"`
-	PT              string    `json:"paging_token"`
-	Successful      bool      `json:"successful"`
-	Hash            string    `json:"hash"`
-	Ledger          int32     `json:"ledger"`
-	LedgerCloseTime time.Time `json:"created_at"`
-	Account         string    `json:"source_account"`
-	AccountSequence string    `json:"source_account_sequence"`
-	FeeAccount      string    `json:"fee_account"`
-	// Action needed in release: horizon-v1.3.0
-	// set json tag to `json:"fee_charged,string"` so max_fee can be marshalled
-	// as a string in the JSON response
-	FeeCharged int64 `json:"fee_charged"`
-	// Action needed in release: horizon-v1.3.0
-	// set json tag to `json:"max_fee,string"` so max_fee can be marshalled
-	// as a string in the JSON response
-	MaxFee             int64               `json:"max_fee"`
+	ID                 string              `json:"id"`
+	PT                 string              `json:"paging_token"`
+	Successful         bool                `json:"successful"`
+	Hash               string              `json:"hash"`
+	Ledger             int32               `json:"ledger"`
+	LedgerCloseTime    time.Time           `json:"created_at"`
+	Account            string              `json:"source_account"`
+	AccountSequence    string              `json:"source_account_sequence"`
+	FeeAccount         string              `json:"fee_account"`
+	FeeCharged         int64               `json:"fee_charged,string"`
+	MaxFee             int64               `json:"max_fee,string"`
 	OperationCount     int32               `json:"operation_count"`
 	EnvelopeXdr        string              `json:"envelope_xdr"`
 	ResultXdr          string              `json:"result_xdr"`
diff --git a/services/horizon/CHANGELOG.md b/services/horizon/CHANGELOG.md
index 588dd0ad10..aac19b5962 100644
--- a/services/horizon/CHANGELOG.md
+++ b/services/horizon/CHANGELOG.md
@@ -3,11 +3,12 @@
 All notable changes to this project will be documented in this
 file. This project adheres to [Semantic Versioning](http://semver.org/).
 
-## unreleased
+## v1.3.0
 
 * Add `last_modified_time` to account responses. `last_modified_time` is the
  closing time of the most recent ledger in which the account was modified.
 * Fix a memory leak in the code responsible for streaming [#2548](https://github.com/stellar/go/pull/2548).
+* Horizon encodes `fee_charged` and `max_fee` as strings when serializing transaction responses to JSON [#2555](https://github.com/stellar/go/pull/2555).
 
 ## v1.2.1