diff --git a/pom.xml b/pom.xml
index e4e5f21d8d357eda3d3011955ad781e257733f51..81a583ee28d7971a886e800d0b0844c9e9eba797 100644
--- a/pom.xml
+++ b/pom.xml
@@ -22,7 +22,7 @@
 		<git.project.url>
 			https://${git.user.name}:${git.user.token}@gitlab.inria.fr/gazelle/applications/test-execution/simulator/pixm-connector.git
 		</git.project.url>
-		<hapifhir_version>5.5.1</hapifhir_version>
+		<hapifhir_version>5.4.0</hapifhir_version>
 		<maven.release.plugin.version>2.5.3</maven.release.plugin.version>
 		<nexus.staging.maven.plugin.version>1.6.8</nexus.staging.maven.plugin.version>
 		<sonar.maven.plugin>3.9.0.2155</sonar.maven.plugin>