diff --git a/build.gradle b/build.gradle
index 3713f27..d260497 100644
--- a/build.gradle
+++ b/build.gradle
@@ -4,10 +4,10 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.3.0'
+        classpath 'com.android.tools.build:gradle:3.3.2'
         classpath 'com.github.dcendents:android-maven-gradle-plugin:2.1'
         classpath 'com.jfrog.bintray.gradle:gradle-bintray-plugin:1.8.4'
-        classpath 'com.dicedmelon.gradle:jacoco-android:0.1.3'
+        classpath 'com.dicedmelon.gradle:jacoco-android:0.1.4'
     }
 }
 
diff --git a/sample/build.gradle b/sample/build.gradle
index 4157ca2..f3719ae 100644
--- a/sample/build.gradle
+++ b/sample/build.gradle
@@ -30,7 +30,7 @@ dependencies {
 }
 
 buildscript {
-    ext.kotlin_version = '1.3.11'
+    ext.kotlin_version = '1.3.21'
     repositories {
         mavenCentral()
     }
diff --git a/sample/src/main/res/layout/activity_main.xml b/sample/src/main/res/layout/activity_main.xml
index 8951a8d..5a14780 100644
--- a/sample/src/main/res/layout/activity_main.xml
+++ b/sample/src/main/res/layout/activity_main.xml
@@ -1,12 +1,9 @@
 <LinearLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:orientation="vertical"
     android:padding="16dp"
-    tools:context="com.g00fy2.versioncomparesample.MainActivity"
-    tools:ignore="HardcodedText"
     >
 
   <LinearLayout
@@ -43,7 +40,6 @@
       android:baselineAligned="false"
       android:orientation="horizontal"
       android:visibility="gone"
-      tools:visibility="visible"
       >
     <LinearLayout
         android:layout_width="match_parent"
diff --git a/versioncompare/build.gradle b/versioncompare/build.gradle
index 17eec6b..9ac3fd4 100644
--- a/versioncompare/build.gradle
+++ b/versioncompare/build.gradle
@@ -16,7 +16,7 @@ dependencies {
 }
 
 jacoco {
-    toolVersion = "0.8.2"
+    toolVersion = "0.8.3"
 }
 
 jacocoAndroidUnitTestReport {
diff --git a/versioncompare/deploy.gradle b/versioncompare/deploy.gradle
index 09b1261..dff31b8 100644
--- a/versioncompare/deploy.gradle
+++ b/versioncompare/deploy.gradle
@@ -12,7 +12,7 @@ ext {
     issueUrl = 'https://github.com/G00fY2/version-compare/issues'
     gitUrl = 'https://github.com/G00fY2/version-compare.git'
 
-    libraryVersion = '1.3.0'
+    libraryVersion = '1.3.1'
 
     developerId = 'g00fy2'
     developerName = 'Thomas Wirth'
diff --git a/versioncompare/src/main/java/com/g00fy2/versioncompare/VersionComparator.java b/versioncompare/src/main/java/com/g00fy2/versioncompare/VersionComparator.java
index 6be8465..a6f44fd 100644
--- a/versioncompare/src/main/java/com/g00fy2/versioncompare/VersionComparator.java
+++ b/versioncompare/src/main/java/com/g00fy2/versioncompare/VersionComparator.java
@@ -48,7 +48,7 @@ static int compareSuffix(@Nonnull final String suffixA, @Nonnull final String su
         return 1;
       } else if (qualifierA < qualifierB) {
         return -1;
-      } else if (qualifierA != UNKNOWN && qualifierB != UNKNOWN) {
+      } else if (qualifierA != UNKNOWN) {
         final int suffixVersionA = preReleaseVersion(suffixA, qualifierA);
         final int suffixVersionB = preReleaseVersion(suffixB, qualifierB);
 
@@ -68,7 +68,7 @@ private static int qualifierToNumber(@Nonnull String suffix) {
       if (suffix.contains(RC_STRING)) return RC;
       if (suffix.contains(BETA_STRING)) return BETA;
       if (suffix.contains(ALPHA_STRING)) {
-        if (suffix.contains(PRE_STRING)) {
+        if (suffix.substring(0, suffix.indexOf(ALPHA_STRING)).contains(PRE_STRING)) {
           return PRE_ALPHA;
         } else {
           return ALPHA;
@@ -84,10 +84,12 @@ private static int preReleaseVersion(@Nonnull final String suffix, final int qua
       final int maxStartIndex = Math.min(startIndex + 2, suffix.length());
       if (containsNumeric(suffix.substring(startIndex, maxStartIndex))) {
         StringBuilder versionNumber = new StringBuilder();
-        for (int i = startIndex, numIndex = -1; i < suffix.length() && (numIndex == -1 || numIndex + 1 == i); i++) {
-          if (Character.isDigit(suffix.charAt(i))) {
-            numIndex = i;
-            versionNumber.append(suffix.charAt(i));
+        for (int i = startIndex; i < suffix.length(); i++) {
+          char c = suffix.charAt(i);
+          if (Character.isDigit(c)) {
+            versionNumber.append(c);
+          } else if (i != startIndex) {
+            break;
           }
         }
         return safeParseInt(versionNumber.toString());