diff --git a/build.gradle b/build.gradle
index 578b244..44b1aaf 100644
--- a/build.gradle
+++ b/build.gradle
@@ -2,7 +2,7 @@ apply plugin: 'java-library'
 apply plugin: 'maven'
 
 group = 'edu.kit.ifv.mobitopp'
-version = '1.x'
+version = '1.51'
 wrapper.gradleVersion = '4.10'
 
 task sourcesJar(type: Jar, dependsOn: classes) {
diff --git a/src/main/java/edu/kit/ifv/mobitopp/actitopp/Configuration.java b/src/main/java/edu/kit/ifv/mobitopp/actitopp/Configuration.java
index 44e7d1c..6bd6567 100644
--- a/src/main/java/edu/kit/ifv/mobitopp/actitopp/Configuration.java
+++ b/src/main/java/edu/kit/ifv/mobitopp/actitopp/Configuration.java
@@ -140,7 +140,7 @@ public class Configuration {
   }
   
   /*
-   * steps that use lineare regression modeling
+   * steps that use linear regression modeling
    */
   public static final HashSet<String> linregsteps_filenames;
   static
@@ -150,13 +150,6 @@ public class Configuration {
   }
   
 
-  
-	
-/*
- * activity types
- */	
-	public static final ArrayList<Byte> ACTIVITY_TYPES_mobiTopp = new ArrayList<Byte>(Arrays.asList((byte)1,(byte)2,(byte)3,(byte)6,(byte)7,(byte)11,(byte)12,(byte)41,(byte)42,(byte)51,(byte)52,(byte)53,(byte)77));
-
 	
 /*
  * activity durations - categories
diff --git a/src/main/java/edu/kit/ifv/mobitopp/actitopp/HActivity.java b/src/main/java/edu/kit/ifv/mobitopp/actitopp/HActivity.java
index 545caa4..3a9081b 100644
--- a/src/main/java/edu/kit/ifv/mobitopp/actitopp/HActivity.java
+++ b/src/main/java/edu/kit/ifv/mobitopp/actitopp/HActivity.java
@@ -194,13 +194,11 @@ public int getEstimatedTripTimeAfterActivity()
 	
 	public byte getMobiToppActType() 
 	{
-		assert Configuration.ACTIVITY_TYPES_mobiTopp.contains(mobiToppActType) : "unknown mobitopp format activity type"; 
 		return mobiToppActType;
 	}
 
 	public void setMobiToppActType(byte mobiToppActType) 
 	{
-		assert Configuration.ACTIVITY_TYPES_mobiTopp.contains(mobiToppActType) : "unknown mobitopp format activity type"; 
 		this.mobiToppActType = mobiToppActType;
 	}