diff --git a/README.md b/README.md
index 31510ee..8893953 100644
--- a/README.md
+++ b/README.md
@@ -51,7 +51,7 @@ In order to facilitate the rapid integration of X-Library, I provide a template
 
 * Support custom request API interface.
 
-* Compatible with Android 6.0 ~ 11.0.
+* Compatible with Android 6.0 ~ 12.0.
 
 * Support Chinese and English language (internationalization).
 
@@ -182,7 +182,7 @@ The following is the version description. Choose one.
 dependencies {
   ...
   // androidx project
-  implementation 'com.github.xuexiangjys:XUpdate:2.1.4'
+  implementation 'com.github.xuexiangjys:XUpdate:2.1.5'
 }
 ```
 
diff --git a/README_ZH.md b/README_ZH.md
index cd1b280..9039538 100644
--- a/README_ZH.md
+++ b/README_ZH.md
@@ -51,7 +51,7 @@
 
 * 支持自定义请求API接口。
 
-* 兼容Android6.0～11.0。
+* 兼容Android6.0～12.0。
 
 * 支持中文和英文两种语言显示（国际化）。
 
@@ -181,7 +181,7 @@ allprojects {
 dependencies {
   ...
   // androidx版本
-  implementation 'com.github.xuexiangjys:XUpdate:2.1.4'
+  implementation 'com.github.xuexiangjys:XUpdate:2.1.5'
 }
 ```
 
diff --git a/app/build.gradle b/app/build.gradle
index ae478a2..a9b1151 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -71,7 +71,7 @@ dependencies {
     androidTestImplementation deps.espresso.core
     implementation project(':xupdate-lib')
 
-//    implementation 'com.github.xuexiangjys:XUpdate:2.1.4'
+//    implementation 'com.github.xuexiangjys:XUpdate:2.1.5'
 
     implementation 'com.github.xuexiangjys.XUtil:xutil-core:2.0.0'
     implementation 'com.github.xuexiangjys.XUtil:xutil-sub:2.0.0'
diff --git a/versions.gradle b/versions.gradle
index 3bf1f39..769bc0d 100644
--- a/versions.gradle
+++ b/versions.gradle
@@ -105,7 +105,7 @@ ext.deps = deps
 def build_versions = [:]
 build_versions.min_sdk = 19
 build_versions.target_sdk = 31
-build_versions.build_tools = "31.0.0"
+build_versions.build_tools = "29.0.3"
 ext.build_versions = build_versions
 
 def app_release = [:]