diff --git a/.gitignore b/.gitignore
index 41e2fabd..c2d91ac2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,3 +10,6 @@ target/
 # IntelliJ
 /.idea
 *.iml
+
+# https://github.com/liquibase/liquibase/issues/2196
+/derby.log
diff --git a/pom.xml b/pom.xml
index 2d774e6d..09f302d0 100644
--- a/pom.xml
+++ b/pom.xml
@@ -13,7 +13,7 @@
     <parent>
         <groupId>com.powsybl</groupId>
         <artifactId>powsybl-parent-ws</artifactId>
-        <version>17</version>
+        <version>18</version>
         <relativePath/>
     </parent>
 
diff --git a/src/test/resources/application-default.yml b/src/test/resources/application-default.yml
index a3aee8bf..8affe98c 100644
--- a/src/test/resources/application-default.yml
+++ b/src/test/resources/application-default.yml
@@ -19,5 +19,5 @@ logging:
 powsybl-ws:
   database:
     vendor: h2:mem
-    query: ;DB_CLOSE_DELAY=-1;DB_CLOSE_ON_EXIT=FALSE;MODE=PostgreSQL
+    query: ;DB_CLOSE_DELAY=-1;DB_CLOSE_ON_EXIT=FALSE;MODE=PostgreSQL;DEFAULT_NULL_ORDERING=HIGH
     hostPort: ":"