diff --git a/CHANGELOG.md b/CHANGELOG.md
index c323735..012c52a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,8 @@
 # Minitrade Changelog
 
+## 0.1.40
+- [Fix] Handle missing field in IB API response.
+
 ## 0.1.39
 - [Fix] Resolve issue with backtesting on Windows. Run `minitrade init` to complete setup before use.
 
diff --git a/pyproject.toml b/pyproject.toml
index ba346db..709056f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "minitrade"
-version = "0.1.39"
+version = "0.1.40"
 description = "A personal automated trading system"
 authors = ["Wei Wu <dodid@outlook.com>"]
 readme = "README.md"