diff --git a/build.gradle b/build.gradle
index 3731ef3acbb..1f1847f2b2a 100644
--- a/build.gradle
+++ b/build.gradle
@@ -138,7 +138,7 @@ dependencies {
     // Cannot be updated to 9.*.* until Jabref works with Java 9
     compile 'org.controlsfx:controlsfx:8.40.15-SNAPSHOT'
 
-    compile 'org.jsoup:jsoup:1.11.3'
+    compile 'org.jsoup:jsoup:1.12.1'
     compile 'com.mashape.unirest:unirest-java:1.4.9'
 
     // >1.8.0-beta is required for java 9 compatibility
diff --git a/src/main/java/org/jabref/logic/importer/IdBasedParserFetcher.java b/src/main/java/org/jabref/logic/importer/IdBasedParserFetcher.java
index 29c1ded0e05..9dd2ec28401 100644
--- a/src/main/java/org/jabref/logic/importer/IdBasedParserFetcher.java
+++ b/src/main/java/org/jabref/logic/importer/IdBasedParserFetcher.java
@@ -11,8 +11,8 @@
 import org.jabref.logic.net.URLDownload;
 import org.jabref.model.cleanup.Formatter;
 import org.jabref.model.entry.BibEntry;
+import org.jabref.model.strings.StringUtil;
 
-import org.jsoup.helper.StringUtil;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
diff --git a/src/main/java/org/jabref/logic/importer/SearchBasedParserFetcher.java b/src/main/java/org/jabref/logic/importer/SearchBasedParserFetcher.java
index 4d1cf696ae6..dd7b732c9ff 100644
--- a/src/main/java/org/jabref/logic/importer/SearchBasedParserFetcher.java
+++ b/src/main/java/org/jabref/logic/importer/SearchBasedParserFetcher.java
@@ -11,8 +11,7 @@
 import org.jabref.logic.net.URLDownload;
 import org.jabref.model.cleanup.Formatter;
 import org.jabref.model.entry.BibEntry;
-
-import org.jsoup.helper.StringUtil;
+import org.jabref.model.strings.StringUtil;
 
 /**
  * Provides a convenient interface for search-based fetcher, which follow the usual three-step procedure:
diff --git a/src/main/java/org/jabref/logic/importer/fetcher/AstrophysicsDataSystem.java b/src/main/java/org/jabref/logic/importer/fetcher/AstrophysicsDataSystem.java
index 6b99f420526..c940d07b193 100644
--- a/src/main/java/org/jabref/logic/importer/fetcher/AstrophysicsDataSystem.java
+++ b/src/main/java/org/jabref/logic/importer/fetcher/AstrophysicsDataSystem.java
@@ -30,10 +30,10 @@
 import org.jabref.model.cleanup.FieldFormatterCleanup;
 import org.jabref.model.entry.BibEntry;
 import org.jabref.model.entry.FieldName;
+import org.jabref.model.strings.StringUtil;
 import org.jabref.model.util.DummyFileUpdateMonitor;
 
 import org.apache.http.client.utils.URIBuilder;
-import org.jsoup.helper.StringUtil;
 
 /**
  * Fetches data from the SAO/NASA Astrophysics Data System (http://www.adsabs.harvard.edu/)
diff --git a/src/main/java/org/jabref/logic/importer/fetcher/IsbnFetcher.java b/src/main/java/org/jabref/logic/importer/fetcher/IsbnFetcher.java
index c1d13f862e9..ac74cec7aca 100644
--- a/src/main/java/org/jabref/logic/importer/fetcher/IsbnFetcher.java
+++ b/src/main/java/org/jabref/logic/importer/fetcher/IsbnFetcher.java
@@ -11,9 +11,9 @@
 import org.jabref.logic.importer.ImportFormatPreferences;
 import org.jabref.model.entry.BibEntry;
 import org.jabref.model.entry.FieldName;
+import org.jabref.model.strings.StringUtil;
 import org.jabref.model.util.OptionalUtil;
 
-import org.jsoup.helper.StringUtil;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
diff --git a/src/main/java/org/jabref/logic/importer/fetcher/IsbnViaChimboriFetcher.java b/src/main/java/org/jabref/logic/importer/fetcher/IsbnViaChimboriFetcher.java
index 82c50b95ff4..4ddd9fa17a5 100644
--- a/src/main/java/org/jabref/logic/importer/fetcher/IsbnViaChimboriFetcher.java
+++ b/src/main/java/org/jabref/logic/importer/fetcher/IsbnViaChimboriFetcher.java
@@ -10,11 +10,11 @@
 import org.jabref.logic.importer.ImportFormatPreferences;
 import org.jabref.logic.importer.ParseException;
 import org.jabref.model.entry.BibEntry;
+import org.jabref.model.strings.StringUtil;
 
 import com.mashape.unirest.http.HttpResponse;
 import com.mashape.unirest.http.Unirest;
 import com.mashape.unirest.http.exceptions.UnirestException;
-import org.jsoup.helper.StringUtil;
 
 /**
  * Fetcher for ISBN using https://bibtex.chimbori.com/, which in turn uses Amazon's API.