diff --git a/pom.xml b/pom.xml
index b7cdaff..fa6850c 100644
--- a/pom.xml
+++ b/pom.xml
@@ -206,7 +206,12 @@
     <log4j2.version>2.0.1</log4j2.version>
     <osgi.framework.version>4.2.0</osgi.framework.version>
     <derby.version>10.14.2.0</derby.version>
-    <version.hsqldb>2.3.2</version.hsqldb>
+    <!--
+      'arquillian-tomee-webprofile-tests' has issues with hsqldb > 2.3.4
+      'examples' have issues with hsqldb > 2.3.5
+      'QuartzPersistenceForEJBTimersTest' cannot obtain a connection -> never timeouts
+    -->
+    <version.hsqldb>2.3.4</version.hsqldb>
     <version.axiom>1.2.20</version.axiom>
     <version.xalan>2.7.2</version.xalan>
     <version.hibernate>5.4.10.Final</version.hibernate>