diff --git a/inception-search-mtas/src/main/java/de/tudarmstadt/ukp/inception/search/index/mtas/MtasUtils.java b/inception-search-mtas/src/main/java/de/tudarmstadt/ukp/inception/search/index/mtas/MtasUtils.java
index b9eaa63a097..6a925856600 100644
--- a/inception-search-mtas/src/main/java/de/tudarmstadt/ukp/inception/search/index/mtas/MtasUtils.java
+++ b/inception-search-mtas/src/main/java/de/tudarmstadt/ukp/inception/search/index/mtas/MtasUtils.java
@@ -17,6 +17,7 @@
  */
 package de.tudarmstadt.ukp.inception.search.index.mtas;
 
+import java.nio.Buffer;
 import java.nio.ByteBuffer;
 
 import org.apache.commons.lang3.StringUtils;
@@ -60,7 +61,9 @@ public static int decodeFSAddress(BytesRef aBytesRef)
     {
         ByteBuffer buffer = ByteBuffer.allocate(4).put(aBytesRef.bytes, aBytesRef.offset,
                 aBytesRef.length);
-        buffer.flip();
+        // Cast to buffer to permit code to run on Java 8.
+        // See: https://github.com/inception-project/inception/issues/1828#issuecomment-717047584
+        ((Buffer) buffer).flip();
         return buffer.getInt();
     }
     
diff --git a/pom.xml b/pom.xml
index 26414da060a..7b696dd9b58 100644
--- a/pom.xml
+++ b/pom.xml
@@ -74,7 +74,7 @@
     <log4j.version>2.13.2</log4j.version>
     <groovy.version>3.0.3</groovy.version>
 
-    <webanno.version>4.0.0-beta-16</webanno.version>
+    <webanno.version>4.0.0-SNAPSHOT</webanno.version>
     <servlet-api.version>4.0.1</servlet-api.version>
     <lucene.version>7.3.1</lucene.version>
     <elasticsearch.version>6.3.0</elasticsearch.version>