diff --git a/pom.xml b/pom.xml
index 1928408..4cb9740 100644
--- a/pom.xml
+++ b/pom.xml
@@ -84,6 +84,18 @@
             <artifactId>kotlin-logging-jvm</artifactId>
             <version>5.1.0</version>
         </dependency>
+        <!-- slf4j dependency must be added after upgrade to 2023.3.0 of powsybl -->
+        <!-- Check if these can be removed when ktor upgrades. Looks like ktor* use 1.7.36 -->
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-log4j12</artifactId>
+            <version>2.0.9</version>
+        </dependency>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-api</artifactId>
+            <version>2.0.9</version>
+        </dependency>
     </dependencies>
 
     <build>