diff --git a/akka-projection-r2dbc/src/it/scala/akka/projection/r2dbc/StartFromSnapshotEndToEndSpec.scala b/akka-projection-r2dbc/src/it/scala/akka/projection/r2dbc/StartFromSnapshotEndToEndSpec.scala
index 53e676fa8..ae9c3ad1b 100644
--- a/akka-projection-r2dbc/src/it/scala/akka/projection/r2dbc/StartFromSnapshotEndToEndSpec.scala
+++ b/akka-projection-r2dbc/src/it/scala/akka/projection/r2dbc/StartFromSnapshotEndToEndSpec.scala
@@ -85,7 +85,7 @@ object StartFromSnapshotEndToEndSpec {
 
   sealed trait HandlerEvt
   final case class Processed(projectionId: ProjectionId, envelope: EventEnvelope[String]) extends HandlerEvt
-  final case object Stopped extends HandlerEvt
+  case object Stopped extends HandlerEvt
 
   class TestHandler(projectionId: ProjectionId, probe: ActorRef[HandlerEvt])
       extends R2dbcHandler[EventEnvelope[String]] {
diff --git a/samples/grpc/iot-service-scala/build.sbt b/samples/grpc/iot-service-scala/build.sbt
index 7c0d26999..bf8f26919 100644
--- a/samples/grpc/iot-service-scala/build.sbt
+++ b/samples/grpc/iot-service-scala/build.sbt
@@ -28,7 +28,7 @@ run / javaOptions ++= sys.props
   .fold(Seq.empty[String])(res => Seq(s"-Dconfig.resource=$res"))
 Global / cancelable := false // ctrl-c
 
-val AkkaVersion = "2.9.0"
+val AkkaVersion = "2.9.1-M1"
 val AkkaHttpVersion = "10.6.0"
 val AkkaManagementVersion = "1.5.0"
 val AkkaPersistenceR2dbcVersion = "1.2.0"
diff --git a/samples/grpc/local-drone-control-java/pom.xml b/samples/grpc/local-drone-control-java/pom.xml
index ba65b9951..0e79fa5e6 100644
--- a/samples/grpc/local-drone-control-java/pom.xml
+++ b/samples/grpc/local-drone-control-java/pom.xml
@@ -17,7 +17,7 @@
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <akka.version>2.9.0</akka.version>
+        <akka.version>2.9.1-M1</akka.version>
         <akka-projection.version>1.5.0</akka-projection.version>
         <akka-persistence-r2dbc.version>1.2.0</akka-persistence-r2dbc.version>
         <akka-management.version>1.5.0</akka-management.version>
diff --git a/samples/grpc/local-drone-control-scala/build.sbt b/samples/grpc/local-drone-control-scala/build.sbt
index 0e562f2da..a652708f1 100644
--- a/samples/grpc/local-drone-control-scala/build.sbt
+++ b/samples/grpc/local-drone-control-scala/build.sbt
@@ -31,7 +31,7 @@ run / javaOptions ++= sys.props
   .fold(Seq.empty[String])(res => Seq(s"-Dconfig.resource=$res"))
 Global / cancelable := false // ctrl-c
 
-val AkkaVersion = "2.9.0"
+val AkkaVersion = "2.9.1-M1"
 val AkkaHttpVersion = "10.6.0"
 val AkkaManagementVersion = "1.5.0"
 val AkkaPersistenceR2dbcVersion = "1.2.0"
diff --git a/samples/grpc/restaurant-drone-deliveries-service-java/pom.xml b/samples/grpc/restaurant-drone-deliveries-service-java/pom.xml
index 88bc41fed..8dd14d714 100644
--- a/samples/grpc/restaurant-drone-deliveries-service-java/pom.xml
+++ b/samples/grpc/restaurant-drone-deliveries-service-java/pom.xml
@@ -17,7 +17,7 @@
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <akka.version>2.9.0</akka.version>
+        <akka.version>2.9.1-M1</akka.version>
         <akka-projection.version>1.5.0</akka-projection.version>
         <akka-persistence-r2dbc.version>1.2.0</akka-persistence-r2dbc.version>
         <akka-management.version>1.5.0</akka-management.version>
diff --git a/samples/grpc/restaurant-drone-deliveries-service-scala/build.sbt b/samples/grpc/restaurant-drone-deliveries-service-scala/build.sbt
index 090e5f9c9..530769727 100644
--- a/samples/grpc/restaurant-drone-deliveries-service-scala/build.sbt
+++ b/samples/grpc/restaurant-drone-deliveries-service-scala/build.sbt
@@ -28,7 +28,7 @@ run / javaOptions ++= sys.props
   .fold(Seq.empty[String])(res => Seq(s"-Dconfig.resource=$res"))
 Global / cancelable := false // ctrl-c
 
-val AkkaVersion = "2.9.0"
+val AkkaVersion = "2.9.1-M1"
 val AkkaHttpVersion = "10.6.0"
 val AkkaManagementVersion = "1.5.0"
 val AkkaPersistenceR2dbcVersion = "1.2.0"
diff --git a/samples/grpc/shopping-analytics-service-java/pom.xml b/samples/grpc/shopping-analytics-service-java/pom.xml
index 43ce774fa..6742748be 100644
--- a/samples/grpc/shopping-analytics-service-java/pom.xml
+++ b/samples/grpc/shopping-analytics-service-java/pom.xml
@@ -17,7 +17,7 @@
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <akka.version>2.9.0</akka.version>
+        <akka.version>2.9.1-M1</akka.version>
         <akka-projection.version>1.5.0</akka-projection.version>
         <akka-persistence-r2dbc.version>1.2.0</akka-persistence-r2dbc.version>
         <akka-management.version>1.5.0</akka-management.version>
diff --git a/samples/grpc/shopping-analytics-service-scala/build.sbt b/samples/grpc/shopping-analytics-service-scala/build.sbt
index ca78a798c..f4f7f8abc 100644
--- a/samples/grpc/shopping-analytics-service-scala/build.sbt
+++ b/samples/grpc/shopping-analytics-service-scala/build.sbt
@@ -28,7 +28,7 @@ run / javaOptions ++= sys.props
   .fold(Seq.empty[String])(res => Seq(s"-Dconfig.resource=$res"))
 Global / cancelable := false // ctrl-c
 
-val AkkaVersion = "2.9.0"
+val AkkaVersion = "2.9.1-M1"
 val AkkaHttpVersion = "10.6.0"
 val AkkaManagementVersion = "1.5.0"
 val AkkaPersistenceR2dbcVersion = "1.2.0"
diff --git a/samples/grpc/shopping-cart-service-java/pom.xml b/samples/grpc/shopping-cart-service-java/pom.xml
index 22234aa4c..1d70e15a9 100644
--- a/samples/grpc/shopping-cart-service-java/pom.xml
+++ b/samples/grpc/shopping-cart-service-java/pom.xml
@@ -17,7 +17,7 @@
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <akka.version>2.9.0</akka.version>
+        <akka.version>2.9.1-M1</akka.version>
         <akka-projection.version>1.5.0</akka-projection.version>
         <akka-persistence-r2dbc.version>1.2.0</akka-persistence-r2dbc.version>
         <akka-management.version>1.5.0</akka-management.version>
diff --git a/samples/grpc/shopping-cart-service-scala/build.sbt b/samples/grpc/shopping-cart-service-scala/build.sbt
index fe33e4c81..eea63f297 100644
--- a/samples/grpc/shopping-cart-service-scala/build.sbt
+++ b/samples/grpc/shopping-cart-service-scala/build.sbt
@@ -28,7 +28,7 @@ run / javaOptions ++= sys.props
   .fold(Seq.empty[String])(res => Seq(s"-Dconfig.resource=$res"))
 Global / cancelable := false // ctrl-c
 
-val AkkaVersion = "2.9.0"
+val AkkaVersion = "2.9.1-M1"
 val AkkaHttpVersion = "10.6.0"
 val AkkaManagementVersion = "1.5.0"
 val AkkaPersistenceR2dbcVersion = "1.2.0"
diff --git a/samples/replicated/shopping-cart-service-java/pom.xml b/samples/replicated/shopping-cart-service-java/pom.xml
index 4f7ea1a17..97de48f1b 100644
--- a/samples/replicated/shopping-cart-service-java/pom.xml
+++ b/samples/replicated/shopping-cart-service-java/pom.xml
@@ -17,7 +17,7 @@
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <akka.version>2.9.0</akka.version>
+        <akka.version>2.9.1-M1</akka.version>
         <akka-projection.version>1.5.0</akka-projection.version>
         <akka-persistence-r2dbc.version>1.2.0</akka-persistence-r2dbc.version>
         <akka-management.version>1.5.0</akka-management.version>