diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index d78ce6c..534eaf2 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -8,7 +8,14 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        java-version: ['11']
+        # Solr 10 requires Java 21 or later.
+        java-version: ['21']
+
+    env:
+      # Until the Solr 10 upgrade is merged into vufind-org/vufind's dev branch,
+      # build and test against the corresponding pull request branch.
+      VUFIND_GIT_URL: https://github.com/stweil/vufind.git
+      VUFIND_BRANCH: update_solr_10
 
     steps:
       - name: Setup PHP
@@ -41,9 +48,10 @@ jobs:
 
       - name: Download and Setup VuFind
         run: |
-          if [ ! -d $VUFIND_HOME/.git ]; then git clone https://github.com/vufind-org/vufind.git $VUFIND_HOME; fi;
+          if [ ! -d $VUFIND_HOME/.git ]; then git clone $VUFIND_GIT_URL $VUFIND_HOME; fi
           cd $VUFIND_HOME
-          git pull
+          git fetch $VUFIND_GIT_URL $VUFIND_BRANCH
+          git checkout -B $VUFIND_BRANCH FETCH_HEAD
           composer install
 
       - name: Create Test Index
diff --git a/build.xml b/build.xml
index 93a9381..7817106 100644
--- a/build.xml
+++ b/build.xml
@@ -13,7 +13,7 @@
   <!-- The solr.install.dir property was added to work around an issue in the Solr 9.1 test suite;
        it can probably be safely removed once VuFind upgrades to Solr 9.2 or higher. -->
   <property name="solr.install.dir" value="${absolute.vufind.dir}/solr/vendor"/>
-  <property name="java.compat.version" value="11"/>
+  <property name="java.compat.version" value="17"/>
 
   <path id="classpath">
     <pathelement location="${builddir}"/>
diff --git a/src/main/java/org/vufind/solr/handler/AuthDB.java b/src/main/java/org/vufind/solr/handler/AuthDB.java
index 3f97ebb..8f3560e 100644
--- a/src/main/java/org/vufind/solr/handler/AuthDB.java
+++ b/src/main/java/org/vufind/solr/handler/AuthDB.java
@@ -61,7 +61,7 @@ public Document getAuthorityRecord(String heading)
                                            heading)),
                                            1));
 
-        if (results.totalHits.value > 0) {
+        if (results.totalHits.value() > 0) {
             return searcher.getIndexReader().storedFields().document(results.scoreDocs[0].doc);
         } else {
             return null;
@@ -79,7 +79,7 @@ public List<Document> getPreferredHeadings(String heading)
         List<Document> result = new ArrayList<> ();
 
         StoredFields storedFields = searcher.getIndexReader().storedFields();
-        for (int i = 0; i < results.totalHits.value; i++) {
+        for (int i = 0; i < results.totalHits.value(); i++) {
             result.add(storedFields.document(results.scoreDocs[i].doc));
         }
 
diff --git a/src/main/java/org/vufind/solr/handler/client/solrj/BrowseRequest.java b/src/main/java/org/vufind/solr/handler/client/solrj/BrowseRequest.java
index ce40d43..070185c 100644
--- a/src/main/java/org/vufind/solr/handler/client/solrj/BrowseRequest.java
+++ b/src/main/java/org/vufind/solr/handler/client/solrj/BrowseRequest.java
@@ -1,8 +1,9 @@
 package org.vufind.solr.handler.client.solrj;
 
-import org.apache.solr.client.solrj.SolrClient;
 import org.apache.solr.client.solrj.SolrRequest;
+import org.apache.solr.client.solrj.SolrRequest.SolrRequestType;
 import org.apache.solr.common.params.SolrParams;
+import org.apache.solr.common.util.NamedList;
 
 /**
  * Client class for sending queries to {@link BrowseRequestHandler}.
@@ -26,25 +27,26 @@ public class BrowseRequest extends SolrRequest<BrowseResponse>
 
     public BrowseRequest()
     {
-        super(METHOD.GET, path);
+        super(METHOD.GET, path, SolrRequestType.QUERY);
     }
 
     public BrowseRequest(SolrParams q)
     {
-        super(METHOD.GET, path);
+        super(METHOD.GET, path, SolrRequestType.QUERY);
         query = q;
     }
 
 
     public BrowseRequest(METHOD m, String path)
     {
-        super(m, path);
+        super(m, path, SolrRequestType.QUERY);
         // TODO Auto-generated constructor stub
     }
 
-    public String getRequestType()
+    @Override
+    public SolrRequestType getRequestType()
     {
-        return "VuFindBrowseRequest";
+        return SolrRequestType.QUERY;
     }
 
     @Override
@@ -54,9 +56,9 @@ public SolrParams getParams()
     }
 
     @Override
-    protected BrowseResponse createResponse(SolrClient client)
+    protected BrowseResponse createResponse(NamedList<Object> res)
     {
-        return new BrowseResponse(client);
+        return new BrowseResponse(res);
     }
 
 }
diff --git a/src/main/java/org/vufind/solr/handler/client/solrj/BrowseResponse.java b/src/main/java/org/vufind/solr/handler/client/solrj/BrowseResponse.java
index 4554e8b..c19fcd3 100644
--- a/src/main/java/org/vufind/solr/handler/client/solrj/BrowseResponse.java
+++ b/src/main/java/org/vufind/solr/handler/client/solrj/BrowseResponse.java
@@ -64,6 +64,14 @@ static protected Map<String,Object> castToMapOfStringObject(Object o)
         return (Map<String,Object>) o;
     }
 
+    /**
+     * Utility constructor to set the namedList
+     */
+    public BrowseResponse(NamedList<Object> res)
+    {
+        this(res, null);
+    }
+
     /**
      * Utility constructor to set the solrServer and namedList
      */
diff --git a/src/main/java/org/vufind/solr/indexing/SolrFieldIterator.java b/src/main/java/org/vufind/solr/indexing/SolrFieldIterator.java
index c0889c7..622d181 100644
--- a/src/main/java/org/vufind/solr/indexing/SolrFieldIterator.java
+++ b/src/main/java/org/vufind/solr/indexing/SolrFieldIterator.java
@@ -76,7 +76,7 @@ private boolean termExists(String t)
     {
         try {
             return (this.searcher.search(new ConstantScoreQuery(new TermQuery(new Term(this.field, t))),
-                                         1).totalHits.value > 0);
+                                          1).totalHits.value() > 0);
         } catch (IOException e) {
             return false;
         }