diff --git a/CHANGELOG.md b/CHANGELOG.md
index efde869a..a2021ef0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,7 +5,7 @@
 - [Optimize: remove discovery module useless code](https://github.com/Tencent/spring-cloud-tencent/pull/595)
 - [Optimize: remove useless code for rest template router](https://github.com/Tencent/spring-cloud-tencent/pull/601)
 - [Optimize: optimize configuration conditional & optimize config data tips](https://github.com/Tencent/spring-cloud-tencent/pull/603)
-- [Automatically transmit some headers specified by a environment varaible that directly defines header keys.](https://github.com/Tencent/spring-cloud-tencent/pull/606)
+- [Automatically transmit some headers specified by an environment variable that directly defines header keys.](https://github.com/Tencent/spring-cloud-tencent/pull/606)
 - [Optimize: Maybe remove Chinese characters](https://github.com/Tencent/spring-cloud-tencent/pull/607)
 - [Optimize: InstanceId of PolarisRegistration and PolarisServiceRegistry](https://github.com/Tencent/spring-cloud-tencent/pull/610)
 - [ fix pr #606 cause ci fail](https://github.com/Tencent/spring-cloud-tencent/pull/613)
@@ -19,3 +19,4 @@
 - [Optimize:optimize transfer](https://github.com/Tencent/spring-cloud-tencent/pull/636)
 - [fix:cancel reporting useless metadata.](https://github.com/Tencent/spring-cloud-tencent/pull/639)
 - [Feature: support read config file from local file system](https://github.com/Tencent/spring-cloud-tencent/pull/640)
+- [fix:optimize expression parser V1.](https://github.com/Tencent/spring-cloud-tencent/pull/642)
diff --git a/spring-cloud-tencent-commons/src/main/java/com/tencent/cloud/common/util/expresstion/ExpressionParserV1.java b/spring-cloud-tencent-commons/src/main/java/com/tencent/cloud/common/util/expresstion/ExpressionParserV1.java
index a5f28e8f..dff35783 100644
--- a/spring-cloud-tencent-commons/src/main/java/com/tencent/cloud/common/util/expresstion/ExpressionParserV1.java
+++ b/spring-cloud-tencent-commons/src/main/java/com/tencent/cloud/common/util/expresstion/ExpressionParserV1.java
@@ -53,7 +53,7 @@ public class ExpressionParserV1 implements ExpressionParser {
 
 	@Override
 	public String parseHeaderKey(String expression) {
-		return expression.substring(LABEL_HEADER_PREFIX_LEN, expression.length() - 1);
+		return StringUtils.substring(expression, LABEL_HEADER_PREFIX_LEN, expression.length() - 1);
 	}
 
 	@Override
@@ -63,7 +63,7 @@ public class ExpressionParserV1 implements ExpressionParser {
 
 	@Override
 	public String parseQueryKey(String expression) {
-		return expression.substring(LABEL_QUERY_PREFIX_LEN, expression.length() - 1);
+		return StringUtils.substring(expression, LABEL_QUERY_PREFIX_LEN, expression.length() - 1);
 	}
 
 	@Override
@@ -73,7 +73,7 @@ public class ExpressionParserV1 implements ExpressionParser {
 
 	@Override
 	public String parseCookieKey(String expression) {
-		return expression.substring(LABEL_COOKIE_PREFIX_LEN, expression.length() - 1);
+		return StringUtils.substring(expression, LABEL_COOKIE_PREFIX_LEN, expression.length() - 1);
 	}
 
 	@Override
diff --git a/spring-cloud-tencent-dependencies/pom.xml b/spring-cloud-tencent-dependencies/pom.xml
index c6bce1da..7e2425a9 100644
--- a/spring-cloud-tencent-dependencies/pom.xml
+++ b/spring-cloud-tencent-dependencies/pom.xml
@@ -73,7 +73,7 @@
 		<revision>1.8.0-2021.0.3-SNAPSHOT</revision>
 
 		<!-- Dependencies -->
-		<polaris.version>1.9.0-SNAPSHOT</polaris.version>
+		<polaris.version>1.9.1</polaris.version>
 		<guava.version>31.0.1-jre</guava.version>
 		<logback.version>1.2.11</logback.version>
 		<mocktio.version>4.5.1</mocktio.version>