diff --git a/logback-classic-blackbox/pom.xml b/logback-classic-blackbox/pom.xml
index 6dd512a3eb..13f477bdfa 100644
--- a/logback-classic-blackbox/pom.xml
+++ b/logback-classic-blackbox/pom.xml
@@ -8,7 +8,7 @@
     <parent>
         <groupId>ch.qos.logback</groupId>
         <artifactId>logback-parent</artifactId>
-        <version>1.5.6</version>
+        <version>1.5.7-SNAPSHPOT</version>
     </parent>
 
     <artifactId>logback-classic-blackbox</artifactId>
diff --git a/logback-classic/pom.xml b/logback-classic/pom.xml
index 20099c87b0..46ff38031f 100755
--- a/logback-classic/pom.xml
+++ b/logback-classic/pom.xml
@@ -8,7 +8,7 @@
   <parent>
     <groupId>ch.qos.logback</groupId>
     <artifactId>logback-parent</artifactId>
-    <version>1.5.6</version>
+    <version>1.5.7-SNAPSHPOT</version>
   </parent>
 
   <artifactId>logback-classic</artifactId>
diff --git a/logback-core-blackbox/pom.xml b/logback-core-blackbox/pom.xml
index 12c66daccc..308ece2888 100644
--- a/logback-core-blackbox/pom.xml
+++ b/logback-core-blackbox/pom.xml
@@ -8,7 +8,7 @@
     <parent>
         <groupId>ch.qos.logback</groupId>
         <artifactId>logback-parent</artifactId>
-        <version>1.5.6</version>
+        <version>1.5.7-SNAPSHPOT</version>
     </parent>
 
     <artifactId>logback-core-blackbox</artifactId>
diff --git a/logback-core/pom.xml b/logback-core/pom.xml
index 9c31ec29b6..cbc2f1128e 100755
--- a/logback-core/pom.xml
+++ b/logback-core/pom.xml
@@ -8,7 +8,7 @@
     <parent>
         <groupId>ch.qos.logback</groupId>
         <artifactId>logback-parent</artifactId>
-        <version>1.5.6</version>
+        <version>1.5.7-SNAPSHPOT</version>
     </parent>
 
     <artifactId>logback-core</artifactId>
diff --git a/logback-examples/pom.xml b/logback-examples/pom.xml
index 9366cd5573..63e27a3d62 100755
--- a/logback-examples/pom.xml
+++ b/logback-examples/pom.xml
@@ -8,7 +8,7 @@
   <parent>
     <groupId>ch.qos.logback</groupId>
     <artifactId>logback-parent</artifactId>
-    <version>1.5.6</version>
+    <version>1.5.7-SNAPSHPOT</version>
   </parent>
 
   <artifactId>logback-examples</artifactId>
diff --git a/pom.xml b/pom.xml
index ea0afe4fd1..64dc132710 100755
--- a/pom.xml
+++ b/pom.xml
@@ -7,7 +7,7 @@
 
   <groupId>ch.qos.logback</groupId>
   <artifactId>logback-parent</artifactId>
-  <version>1.5.6</version>
+  <version>1.5.7-SNAPSHPOT</version>
   <packaging>pom</packaging>
 
   <name>Logback-Parent</name>
@@ -48,7 +48,7 @@
 
   <properties>
     <!-- yyyy-MM-dd'T'HH:mm:ss'Z' -->
-    <project.build.outputTimestamp>2024-04-17T17:38:00Z</project.build.outputTimestamp>
+    <project.build.outputTimestamp>2024-04-17T18:35:37Z</project.build.outputTimestamp>
 
     <!-- minimal JDK version at runtime -->
     <jdk.version>11</jdk.version>
@@ -72,7 +72,7 @@
     <!-- slf4j.version property is used below, in
          logback-classic/pom.xml, /logback-examples/src/main/resources/setClasspath.cmd, download.html
     -->    
-    <slf4j.version>2.0.13</slf4j.version>
+    <slf4j.version>2.1.0-alpha2-SNAPSHOT</slf4j.version>
     <cal10n.version>0.8.1</cal10n.version>
     <consolePlugin.version>1.1.0</consolePlugin.version>
     <tomcat.version>10.0.10</tomcat.version>