diff --git a/pom.xml b/pom.xml
index a16f13da..b232abbb 100644
--- a/pom.xml
+++ b/pom.xml
@@ -49,7 +49,7 @@
     <guice.version>5.1.0</guice.version>
     <hibernate.version>5.6.10.Final</hibernate.version><!-- > 4.2.7 uses javassist, leads to "org.hibernate.jpa.boot.archive.spi.ArchiveException:			Could not build ClassFile", > 4.3.8.Final : java.lang.ClassNotFoundException: javax.transaction.SystemException -->
     <hsqldb.version>2.3.3</hsqldb.version>
-    <jackson.version>2.13.3</jackson.version><!-- 2.6.1 gives NoClassDefFoundError -->
+    <jackson.version>2.13.4</jackson.version><!-- 2.6.1 gives NoClassDefFoundError -->
     <javaxservlet-api.version>3.0-alpha-1</javaxservlet-api.version>
     <jaxb-api.version>2.4.0-b180830.0359</jaxb-api.version>
     <jaxrstools.version>0.1.0</jaxrstools.version>
@@ -73,7 +73,7 @@
     <security.version>2.1.4</security.version><!-- <security.version>2.2.1</security.version> --><!-- nog niet voldoende getest -->
     <servlet-api.version>3.1.0</servlet-api.version>
     <slf4j.version>1.7.10</slf4j.version>
-    <solr.version>4.5.0</solr.version><!-- 4.7.0 throws an error -->
+    <solr.version>9.0.0</solr.version><!-- 4.7.0 throws an error -->
     <tomcat-maven.version>1.1</tomcat-maven.version>
     <tomcatservlet-api.version>6.0.36</tomcatservlet-api.version>
     <urlrewritefilter.version>4.0.4</urlrewritefilter.version>