diff --git a/pom.xml b/pom.xml
index f9ffd9ba5..8c1b0408a 100644
--- a/pom.xml
+++ b/pom.xml
@@ -4,7 +4,7 @@
 
   <groupId>uk.ac.ebi</groupId>
   <artifactId>jutils</artifactId>
-  <version>12.0.1-SNAPSHOT</version>
+  <version>13.0-SNAPSHOT</version>
   
   
   <name>JUtils - Miscellanea of Java Utils</name>
@@ -142,7 +142,7 @@
 		<dependency>
 		  <groupId>org.springframework</groupId>
 		  <artifactId>spring-web</artifactId>
-		  <version>5.3.25</version>
+		  <version>6.0.11</version>
 		  <optional>true</optional>
 		</dependency>
 
@@ -158,9 +158,9 @@
 
 		<!-- Required by uk.ac.ebi.utils.opt.net.ConfigBootstrapWebListener -->
 		<dependency>
-			<groupId>javax.servlet</groupId>
-			<artifactId>javax.servlet-api</artifactId>
-			<version>4.0.1</version>
+			<groupId>jakarta.servlet</groupId>
+			<artifactId>jakarta.servlet-api</artifactId>
+			<version>6.0.0</version>
 			<optional>true</optional>
 		</dependency>
 
diff --git a/revision-history.md b/revision-history.md
index 2037fa516..260f955d0 100644
--- a/revision-history.md
+++ b/revision-history.md
@@ -1,12 +1,15 @@
 # Revision History
 
-*This file was last revised on 2023-07-26*. **Please keep this note updated**.
+*This file was last revised on 2023-07-31*. **Please keep this note updated**.
 
-## 12.0.1-SNAPSHOT
-* Current snapshot
+## 13.0.1-SNAPSHOT
 
+## 13.0
+* **These migrations are incompatible with older versions**:
+  * `javax.servlet-api` migrated to `jakarta.servlet-api`.
+  * `spring-web` moved to 6.0.
 
-## 12.0-SNAPSHOT
+## 12.0
 * Migration to Java 17. **No backward compatibility guaranteed**.
 
 ## 11.1.1
diff --git a/src/main/java/uk/ac/ebi/utils/opt/net/ConfigBootstrapWebListener.java b/src/main/java/uk/ac/ebi/utils/opt/net/ConfigBootstrapWebListener.java
index 02f0fa7c9..e8a338420 100644
--- a/src/main/java/uk/ac/ebi/utils/opt/net/ConfigBootstrapWebListener.java
+++ b/src/main/java/uk/ac/ebi/utils/opt/net/ConfigBootstrapWebListener.java
@@ -3,8 +3,8 @@
 import java.util.HashMap;
 import java.util.Map;
 
-import javax.servlet.ServletContextEvent;
-import javax.servlet.ServletContextListener;
+import jakarta.servlet.ServletContextEvent;
+import jakarta.servlet.ServletContextListener;
 
 import uk.ac.ebi.utils.collections.OptionsMap;
 
@@ -54,7 +54,7 @@ public void contextInitialized ( ServletContextEvent sce )
 	@Override
 	public void contextDestroyed ( ServletContextEvent sce )
 	{
-		// Does nothing, added just for compatibility with older servlet APIs.
+		// Does nothing, added just for compatibility with servlet APIs.
 	}
 
 	
diff --git a/src/main/java/uk/ac/ebi/utils/opt/springweb/exceptions/ResponseStatusException2.java b/src/main/java/uk/ac/ebi/utils/opt/springweb/exceptions/ResponseStatusException2.java
index 09c62c933..514904604 100644
--- a/src/main/java/uk/ac/ebi/utils/opt/springweb/exceptions/ResponseStatusException2.java
+++ b/src/main/java/uk/ac/ebi/utils/opt/springweb/exceptions/ResponseStatusException2.java
@@ -3,6 +3,7 @@
 import java.util.Optional;
 
 import org.springframework.http.HttpStatus;
+import org.springframework.http.HttpStatusCode;
 import org.springframework.web.server.ResponseStatusException;
 
 /**
@@ -54,7 +55,12 @@ public ResponseStatusException2 ( int rawStatusCode, String reason, Throwable ca
 	 */
 	public String getMessage ()
 	{
-		int code = this.getRawStatusCode ();
+		HttpStatusCode statusCode = Optional.ofNullable ( this.getStatusCode () )
+				.orElse ( HttpStatus.INTERNAL_SERVER_ERROR );
+		
+		int code = statusCode.value ();
+		
+		// Finding a reason with Spring >= 6
 		HttpStatus status = HttpStatus.resolve ( code );
 		
 		String codeStr = "HTTP " +