diff --git a/app/build.gradle b/app/build.gradle
index d99118fc5..7469f6cf2 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -98,7 +98,7 @@ dependencies {
     implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
     implementation 'androidx.swiperefreshlayout:swiperefreshlayout:1.0.0'
     implementation 'androidx.viewpager2:viewpager2:1.0.0'
-    implementation 'com.google.android.material:material:1.2.0-alpha02'
+    implementation 'com.google.android.material:material:1.2.0-alpha03'
     implementation 'com.google.android:flexbox:1.1.0'
 
     //lifecycle
@@ -107,12 +107,12 @@ dependencies {
     implementation "androidx.lifecycle:lifecycle-common-java8:$lifecycle_version"
 
     //room
-    def room_version = '2.2.2'
+    def room_version = '2.2.3'
     implementation "androidx.room:room-runtime:$room_version"
     kapt "androidx.room:room-compiler:$room_version"
 
     //paging
-    implementation 'androidx.paging:paging-runtime:2.1.0'
+    implementation 'androidx.paging:paging-runtime:2.1.1'
 
     //anko
     def anko_version = '0.10.8'
diff --git a/app/src/main/java/io/legado/app/model/analyzeRule/AnalyzeRule.kt b/app/src/main/java/io/legado/app/model/analyzeRule/AnalyzeRule.kt
index c2ed7c8da..419164917 100644
--- a/app/src/main/java/io/legado/app/model/analyzeRule/AnalyzeRule.kt
+++ b/app/src/main/java/io/legado/app/model/analyzeRule/AnalyzeRule.kt
@@ -614,7 +614,7 @@ class AnalyzeRule(var book: BaseBook? = null) : JsExtensions {
         val pattern = Pattern.compile("(第)(.+?)(章)")
         val matcher = pattern.matcher(s)
         return if (matcher.find()) {
-            matcher.group(1) + StringUtils.stringToInt(matcher.group(2)) + matcher.group(3)
+            matcher.group(1)!! + StringUtils.stringToInt(matcher.group(2)) + matcher.group(3)
         } else {
             s
         }