From 60fdcb527743efacf1ef9ac5b9543fcbd597b1ce Mon Sep 17 00:00:00 2001
From: Linfeng Qian <thewawar@gmail.com>
Date: Fri, 18 Nov 2022 17:20:32 +0800
Subject: [PATCH 1/2] fix: transaction fee round

---
 src/tx_builder/mod.rs | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/tx_builder/mod.rs b/src/tx_builder/mod.rs
index 41fcf1fe..ae26f0f8 100644
--- a/src/tx_builder/mod.rs
+++ b/src/tx_builder/mod.rs
@@ -455,10 +455,12 @@ pub fn balance_tx_capacity(
                     //   * second 4 bytes if for output data offset
                     //   * third 4 bytes is for output offset
                     let output_header_extra = 4 + 4 + 4;
+                    // NOTE: extra_min_fee +1 is for `FeeRate::fee` round
                     let extra_min_fee = balancer
                         .fee_rate
                         .fee(base_change_output.as_slice().len() + output_header_extra)
-                        .as_u64();
+                        .as_u64()
+                        + 1;
                     // The extra capacity (delta - extra_min_fee) is enough to hold the change cell.
                     if delta >= base_change_occupied_capacity + extra_min_fee {
                         // next loop round must return new_tx;
@@ -506,7 +508,9 @@ pub fn balance_tx_capacity(
                 }
             }
             // fee is positive and `fee < min_fee`
-            Ok(_fee) => {}
+            Ok(fee) => {
+                need_more_capacity = min_fee - fee;
+            }
             Err(TransactionFeeError::CapacityOverflow(delta)) => {
                 need_more_capacity = delta + min_fee;
             }

From 85627042146f248ab53c28841f204aba43bceace Mon Sep 17 00:00:00 2001
From: Linfeng Qian <thewawar@gmail.com>
Date: Sun, 20 Nov 2022 10:35:57 +0800
Subject: [PATCH 2/2] chore: bump up to v2.3.1

---
 Cargo.toml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Cargo.toml b/Cargo.toml
index 05c6f4c8..fb3447eb 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "ckb-sdk"
-version = "2.3.0"
+version = "2.3.1"
 authors = ["Linfeng Qian <thewawar@gmail.com>", "Nervos Core Dev <dev@nervos.org>"]
 edition = "2018"
 license = "MIT"