diff --git a/CHANGELOG.md b/CHANGELOG.md
index 700744d9516..3cae132a85f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -78,6 +78,7 @@ Note that this project **does not** adhere to [Semantic Versioning](http://semve
 - We now encrypt and store the custom API keys in the OS native credential store. [#10044](https://github.com/JabRef/jabref/issues/10044)
 - We changed the behavior of group addition/edit, so that sorting by alphabetical order is not performed by default after the modification [#10017](https://github.com/JabRef/jabref/issues/10017)
 - We fixed an issue with spacing in the cleanup dialogue. [#10081](https://github.com/JabRef/jabref/issues/10081)
+- The GVK fetcher now uses the new [K10plus](https://www.bszgbv.de/services/k10plus/) database [#10189](https://github.com/JabRef/jabref/pull/10189)
 
 ### Fixed
 
diff --git a/src/main/java/org/jabref/logic/importer/fetcher/GvkFetcher.java b/src/main/java/org/jabref/logic/importer/fetcher/GvkFetcher.java
index ad3982d5dfe..81e011ccde0 100644
--- a/src/main/java/org/jabref/logic/importer/fetcher/GvkFetcher.java
+++ b/src/main/java/org/jabref/logic/importer/fetcher/GvkFetcher.java
@@ -19,7 +19,7 @@
 
 public class GvkFetcher implements SearchBasedParserFetcher {
 
-    private static final String URL_PATTERN = "http://sru.gbv.de/gvk?";
+    private static final String URL_PATTERN = "https://sru.k10plus.de/gvk?";
 
     /**
      * Searchkeys are used to specify a search request. For example "tit" stands for "title".
diff --git a/src/main/java/org/jabref/logic/importer/fileformat/PicaXmlParser.java b/src/main/java/org/jabref/logic/importer/fileformat/PicaXmlParser.java
index ba488552613..9b0fd526a3d 100644
--- a/src/main/java/org/jabref/logic/importer/fileformat/PicaXmlParser.java
+++ b/src/main/java/org/jabref/logic/importer/fileformat/PicaXmlParser.java
@@ -445,7 +445,7 @@ private String getSubfield(String a, Element datafield) {
         List<Element> liste = getChildren("subfield", datafield);
 
         for (Element subfield : liste) {
-            if (subfield.getAttribute("code").equals(a)) {
+            if (subfield.getAttribute("code").equalsIgnoreCase(a)) {
                 return subfield.getTextContent();
             }
         }
diff --git a/src/test/java/org/jabref/logic/importer/fetcher/BvbFetcherTest.java b/src/test/java/org/jabref/logic/importer/fetcher/BvbFetcherTest.java
index 0bc03b1ce9b..402350e179e 100644
--- a/src/test/java/org/jabref/logic/importer/fetcher/BvbFetcherTest.java
+++ b/src/test/java/org/jabref/logic/importer/fetcher/BvbFetcherTest.java
@@ -52,7 +52,8 @@ public void setUp() {
                 .withField(StandardField.FILE, "ParsedFileField{description='', link='http://search.ebscohost.com/login.aspx?direct=true&scope=site&db=nlebk&db=nlabk&AN=1906353', fileType='PDF'}")
                 .withField(StandardField.ISBN, "9783960886402")
                 .withField(StandardField.KEYWORDS, "Klassen, Interfaces, Generics, Enums, Annotationen, Lambdas, Streams, Module, parallel, Parallele Programmierung, Serialisierung, funktional, funktionale Programmierung, Java EE, Jakarta EE")
-                .withField(StandardField.LOCATION, "Heidelberg")
+                .withField(StandardField.ADDRESS, "Heidelberg")
+                .withField(StandardField.PAGETOTAL, "396")
                 .withField(StandardField.PUBLISHER, "{dpunkt.verlag} and {Dpunkt. Verlag (Heidelberg)}");
 
         bibEntryISBN0134685997 = new BibEntry(StandardEntryType.Misc)
@@ -62,7 +63,8 @@ public void setUp() {
                 .withField(StandardField.TITLEADDON, "Joshua Bloch")
                 .withField(StandardField.EDITION, "Third edition")
                 .withField(StandardField.ISBN, "0134685997")
-                .withField(StandardField.LOCATION, "Boston")
+                .withField(StandardField.PAGETOTAL, "392")
+                .withField(StandardField.ADDRESS, "Boston")
                 .withField(StandardField.PUBLISHER, "{Addison-Wesley}");
     }
 
diff --git a/src/test/java/org/jabref/logic/importer/fetcher/GvkFetcherTest.java b/src/test/java/org/jabref/logic/importer/fetcher/GvkFetcherTest.java
index 17e8b2ded4e..f47e4ad9180 100644
--- a/src/test/java/org/jabref/logic/importer/fetcher/GvkFetcherTest.java
+++ b/src/test/java/org/jabref/logic/importer/fetcher/GvkFetcherTest.java
@@ -36,10 +36,10 @@ public void setUp() {
                 .withField(StandardField.PUBLISHER, "Addison-Wesley")
                 .withField(StandardField.YEAR, "2008")
                 .withField(StandardField.AUTHOR, "Joshua Bloch")
-                .withField(StandardField.SERIES, "The @Java series")
-                .withField(StandardField.ADDRESS, "Upper Saddle River, NJ [u.a.]")
+                .withField(StandardField.SERIES, "The Java series ... from the source")
+                .withField(StandardField.ADDRESS, "Upper Saddle River, NJ")
                 .withField(StandardField.EDITION, "2. ed., 5. print.")
-                .withField(StandardField.NOTE, "Literaturverz. S. 321 - 325")
+                .withField(StandardField.NOTE, "Includes bibliographical references and index. - Previous ed.: 2001. - Hier auch später erschienene, unveränderte Nachdrucke")
                 .withField(StandardField.ISBN, "9780321356680")
                 .withField(StandardField.PAGETOTAL, "XXI, 346")
                 .withField(new UnknownField("ppn_gvk"), "591166003")
@@ -67,7 +67,7 @@ public void simpleSearchQueryURLCorrect() throws Exception {
         String query = "java jdk";
         QueryNode luceneQuery = new StandardSyntaxParser().parse(query, AbstractQueryTransformer.NO_EXPLICIT_FIELD);
         URL url = fetcher.getURLForQuery(luceneQuery);
-        assertEquals("http://sru.gbv.de/gvk?version=1.1&operation=searchRetrieve&query=pica.all%3Djava+and+pica.all%3Djdk&maximumRecords=50&recordSchema=picaxml&sortKeys=Year%2C%2C1", url.toString());
+        assertEquals("https://sru.k10plus.de/gvk?version=1.1&operation=searchRetrieve&query=pica.all%3Djava+and+pica.all%3Djdk&maximumRecords=50&recordSchema=picaxml&sortKeys=Year%2C%2C1", url.toString());
     }
 
     @Test
@@ -75,7 +75,7 @@ public void complexSearchQueryURLCorrect() throws Exception {
         String query = "kon:java tit:jdk";
         QueryNode luceneQuery = new StandardSyntaxParser().parse(query, AbstractQueryTransformer.NO_EXPLICIT_FIELD);
         URL url = fetcher.getURLForQuery(luceneQuery);
-        assertEquals("http://sru.gbv.de/gvk?version=1.1&operation=searchRetrieve&query=pica.kon%3Djava+and+pica.tit%3Djdk&maximumRecords=50&recordSchema=picaxml&sortKeys=Year%2C%2C1", url.toString());
+        assertEquals("https://sru.k10plus.de/gvk?version=1.1&operation=searchRetrieve&query=pica.kon%3Djava+and+pica.tit%3Djdk&maximumRecords=50&recordSchema=picaxml&sortKeys=Year%2C%2C1", url.toString());
     }
 
     @Test