[maven-release-plugin] prepare for next development iteration
diff --git a/log4j-1.2-api/pom.xml b/log4j-1.2-api/pom.xml
index a816ae2..a9496ce 100644
--- a/log4j-1.2-api/pom.xml
+++ b/log4j-1.2-api/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>org.apache.logging.log4j</groupId>
     <artifactId>log4j</artifactId>
-    <version>2.1</version>
+    <version>2.2-SNAPSHOT</version>
     <relativePath>../</relativePath>
   </parent>
   <artifactId>log4j-1.2-api</artifactId>
diff --git a/log4j-api/pom.xml b/log4j-api/pom.xml
index a24e2a0..a81117d 100644
--- a/log4j-api/pom.xml
+++ b/log4j-api/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>org.apache.logging.log4j</groupId>
     <artifactId>log4j</artifactId>
-    <version>2.1</version>
+    <version>2.2-SNAPSHOT</version>
     <relativePath>../</relativePath>
   </parent>
   <artifactId>log4j-api</artifactId>
diff --git a/log4j-bom/pom.xml b/log4j-bom/pom.xml
index dff4f74..b0f6347 100644
--- a/log4j-bom/pom.xml
+++ b/log4j-bom/pom.xml
@@ -26,7 +26,7 @@
   <description>Apache Log4j Bill of Materials</description>
   <groupId>org.apache.logging.log4j</groupId>
   <artifactId>log4j-bom</artifactId>
-  <version>2.1</version>
+  <version>2.2-SNAPSHOT</version>
   <packaging>pom</packaging>
   <dependencyManagement>
     <dependencies>
@@ -34,61 +34,61 @@
       <dependency>
         <groupId>org.apache.logging.log4j</groupId>
         <artifactId>log4j-api</artifactId>
-        <version>2.1</version>
+        <version>2.2-SNAPSHOT</version>
       </dependency>
       <!-- Core Log4j -->
       <dependency>
         <groupId>org.apache.logging.log4j</groupId>
         <artifactId>log4j-core</artifactId>
-        <version>2.1</version>
+        <version>2.2-SNAPSHOT</version>
       </dependency>
       <!-- Legacy Log4j 1.2 API -->
       <dependency>
         <groupId>org.apache.logging.log4j</groupId>
         <artifactId>log4j-1.2-api</artifactId>
-        <version>2.1</version>
+        <version>2.2-SNAPSHOT</version>
       </dependency>
       <!-- Commons Logging Compatibility API -->
       <dependency>
         <groupId>org.apache.logging.log4j</groupId>
         <artifactId>log4j-jcl</artifactId>
-        <version>2.1</version>
+        <version>2.2-SNAPSHOT</version>
       </dependency>
       <!-- Apache Flume Bridge -->
       <dependency>
         <groupId>org.apache.logging.log4j</groupId>
         <artifactId>log4j-flume-ng</artifactId>
-        <version>2.1</version>
+        <version>2.2-SNAPSHOT</version>
       </dependency>
       <!-- JSP Tag Library -->
       <dependency>
         <groupId>org.apache.logging.log4j</groupId>
         <artifactId>log4j-taglib</artifactId>
-        <version>2.1</version>
+        <version>2.2-SNAPSHOT</version>
       </dependency>
       <!-- JMX GUI -->
       <dependency>
         <groupId>org.apache.logging.log4j</groupId>
         <artifactId>log4j-jmx-gui</artifactId>
-        <version>2.1</version>
+        <version>2.2-SNAPSHOT</version>
       </dependency>
       <!-- SLF4J Compatibility API -->
       <dependency>
         <groupId>org.apache.logging.log4j</groupId>
         <artifactId>log4j-slf4j-impl</artifactId>
-        <version>2.1</version>
+        <version>2.2-SNAPSHOT</version>
       </dependency>
       <!-- Web Application Support -->
       <dependency>
         <groupId>org.apache.logging.log4j</groupId>
         <artifactId>log4j-web</artifactId>
-        <version>2.1</version>
+        <version>2.2-SNAPSHOT</version>
       </dependency>
       <!-- NoSQL Appender Plugins -->
       <dependency>
         <groupId>org.apache.logging.log4j</groupId>
         <artifactId>log4j-nosql</artifactId>
-        <version>2.1</version>
+        <version>2.2-SNAPSHOT</version>
       </dependency>
       <!-- Streaming API -->
       <dependency>
@@ -111,8 +111,4 @@
       </plugin>
     </plugins>
   </build>
-
-  <scm>
-    <tag>log4j-2.1</tag>
-  </scm>
 </project>
diff --git a/log4j-core/pom.xml b/log4j-core/pom.xml
index a7e699e..bce06bf 100644
--- a/log4j-core/pom.xml
+++ b/log4j-core/pom.xml
@@ -21,7 +21,7 @@
   <parent>
     <groupId>org.apache.logging.log4j</groupId>
     <artifactId>log4j</artifactId>
-    <version>2.1</version>
+    <version>2.2-SNAPSHOT</version>
     <relativePath>../</relativePath>
   </parent>
   <artifactId>log4j-core</artifactId>
diff --git a/log4j-distribution/pom.xml b/log4j-distribution/pom.xml
index 06b7ff1..5c0cbd7 100644
--- a/log4j-distribution/pom.xml
+++ b/log4j-distribution/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>org.apache.logging.log4j</groupId>
     <artifactId>log4j</artifactId>
-    <version>2.1</version>
+    <version>2.2-SNAPSHOT</version>
     <relativePath>../</relativePath>
   </parent>
   <artifactId>log4j-distribution</artifactId>
diff --git a/log4j-flume-ng/pom.xml b/log4j-flume-ng/pom.xml
index 250a614..4fe0fe8 100644
--- a/log4j-flume-ng/pom.xml
+++ b/log4j-flume-ng/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>org.apache.logging.log4j</groupId>
     <artifactId>log4j</artifactId>
-    <version>2.1</version>
+    <version>2.2-SNAPSHOT</version>
     <relativePath>../</relativePath>
   </parent>
   <artifactId>log4j-flume-ng</artifactId>
diff --git a/log4j-iostreams/pom.xml b/log4j-iostreams/pom.xml
index 1c1db4b..367783d 100644
--- a/log4j-iostreams/pom.xml
+++ b/log4j-iostreams/pom.xml
@@ -20,11 +20,11 @@
   <parent>
     <groupId>org.apache.logging.log4j</groupId>
     <artifactId>log4j</artifactId>
-    <version>2.1</version>
+    <version>2.2-SNAPSHOT</version>
     <relativePath>../</relativePath>
   </parent>
   <artifactId>log4j-iostreams</artifactId>
-  <version>2.1</version>
+  <version>2.2-SNAPSHOT</version>
   <packaging>jar</packaging>
   <name>Apache Log4j Streaming Interface</name>
   <description>The Apache Log4j streams to log event converters</description>
diff --git a/log4j-jcl/pom.xml b/log4j-jcl/pom.xml
index 33724c2..6aae66a 100644
--- a/log4j-jcl/pom.xml
+++ b/log4j-jcl/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>org.apache.logging.log4j</groupId>
     <artifactId>log4j</artifactId>
-    <version>2.1</version>
+    <version>2.2-SNAPSHOT</version>
     <relativePath>../</relativePath>
   </parent>
   <artifactId>log4j-jcl</artifactId>
diff --git a/log4j-jmx-gui/pom.xml b/log4j-jmx-gui/pom.xml
index 1264785..b0cf26d 100644
--- a/log4j-jmx-gui/pom.xml
+++ b/log4j-jmx-gui/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>org.apache.logging.log4j</groupId>
     <artifactId>log4j</artifactId>
-    <version>2.1</version>
+    <version>2.2-SNAPSHOT</version>
     <relativePath>../</relativePath>
   </parent>
   <artifactId>log4j-jmx-gui</artifactId>
diff --git a/log4j-jul/pom.xml b/log4j-jul/pom.xml
index 8e5a704..7ac483b 100644
--- a/log4j-jul/pom.xml
+++ b/log4j-jul/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <artifactId>log4j</artifactId>
     <groupId>org.apache.logging.log4j</groupId>
-    <version>2.1</version>
+    <version>2.2-SNAPSHOT</version>
     <relativePath>../</relativePath>
   </parent>
   <modelVersion>4.0.0</modelVersion>
diff --git a/log4j-nosql/pom.xml b/log4j-nosql/pom.xml
index 0678f04..91263c4 100644
--- a/log4j-nosql/pom.xml
+++ b/log4j-nosql/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <artifactId>log4j</artifactId>
     <groupId>org.apache.logging.log4j</groupId>
-    <version>2.1</version>
+    <version>2.2-SNAPSHOT</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
 
diff --git a/log4j-perf/pom.xml b/log4j-perf/pom.xml
index 2c636ce..65455e7 100644
--- a/log4j-perf/pom.xml
+++ b/log4j-perf/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <artifactId>log4j</artifactId>
     <groupId>org.apache.logging.log4j</groupId>
-    <version>2.1</version>
+    <version>2.2-SNAPSHOT</version>
     <relativePath>../</relativePath>
   </parent>
 
diff --git a/log4j-samples/flume-common/pom.xml b/log4j-samples/flume-common/pom.xml
index acbd51e..cda06f7 100644
--- a/log4j-samples/flume-common/pom.xml
+++ b/log4j-samples/flume-common/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <artifactId>log4j-samples</artifactId>
     <groupId>org.apache.logging.log4j.samples</groupId>
-    <version>2.1</version>
+    <version>2.2-SNAPSHOT</version>
   </parent>
   <artifactId>log4j-samples-flume-common</artifactId>
   <packaging>jar</packaging>
diff --git a/log4j-samples/flume-embedded/pom.xml b/log4j-samples/flume-embedded/pom.xml
index e0dba95..dcfd5c2 100644
--- a/log4j-samples/flume-embedded/pom.xml
+++ b/log4j-samples/flume-embedded/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <artifactId>log4j-samples</artifactId>
     <groupId>org.apache.logging.log4j.samples</groupId>
-    <version>2.1</version>
+    <version>2.2-SNAPSHOT</version>
   </parent>
   <artifactId>log4j-samples-flume-embedded</artifactId>
   <packaging>war</packaging>
diff --git a/log4j-samples/flume-remote/pom.xml b/log4j-samples/flume-remote/pom.xml
index 7eb62a1..6a19202 100644
--- a/log4j-samples/flume-remote/pom.xml
+++ b/log4j-samples/flume-remote/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <artifactId>log4j-samples</artifactId>
     <groupId>org.apache.logging.log4j.samples</groupId>
-    <version>2.1</version>
+    <version>2.2-SNAPSHOT</version>
   </parent>
   <artifactId>log4j-samples-flume-remote</artifactId>
   <packaging>war</packaging>
diff --git a/log4j-samples/pom.xml b/log4j-samples/pom.xml
index 43ebbbb..1d3fa66 100644
--- a/log4j-samples/pom.xml
+++ b/log4j-samples/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>org.apache.logging.log4j</groupId>
     <artifactId>log4j</artifactId>
-    <version>2.1</version>
+    <version>2.2-SNAPSHOT</version>
     <relativePath>../</relativePath>
   </parent>
   <groupId>org.apache.logging.log4j.samples</groupId>
diff --git a/log4j-slf4j-impl/pom.xml b/log4j-slf4j-impl/pom.xml
index 1c8d501..b3ae99d 100644
--- a/log4j-slf4j-impl/pom.xml
+++ b/log4j-slf4j-impl/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>org.apache.logging.log4j</groupId>
     <artifactId>log4j</artifactId>
-    <version>2.1</version>
+    <version>2.2-SNAPSHOT</version>
     <relativePath>../</relativePath>
   </parent>
   <artifactId>log4j-slf4j-impl</artifactId>
diff --git a/log4j-taglib/pom.xml b/log4j-taglib/pom.xml
index 950aeea..40470b9 100644
--- a/log4j-taglib/pom.xml
+++ b/log4j-taglib/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>org.apache.logging.log4j</groupId>
     <artifactId>log4j</artifactId>
-    <version>2.1</version>
+    <version>2.2-SNAPSHOT</version>
     <relativePath>../</relativePath>
   </parent>
   <artifactId>log4j-taglib</artifactId>
diff --git a/log4j-to-slf4j/pom.xml b/log4j-to-slf4j/pom.xml
index 33f3e50..0516f13 100644
--- a/log4j-to-slf4j/pom.xml
+++ b/log4j-to-slf4j/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>org.apache.logging.log4j</groupId>
     <artifactId>log4j</artifactId>
-    <version>2.1</version>
+    <version>2.2-SNAPSHOT</version>
     <relativePath>../</relativePath>
   </parent>
   <artifactId>log4j-to-slf4j</artifactId>
diff --git a/log4j-web/pom.xml b/log4j-web/pom.xml
index 26eca66..d15206a 100644
--- a/log4j-web/pom.xml
+++ b/log4j-web/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <artifactId>log4j</artifactId>
     <groupId>org.apache.logging.log4j</groupId>
-    <version>2.1</version>
+    <version>2.2-SNAPSHOT</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
 
diff --git a/pom.xml b/pom.xml
index e778882..0bf7539 100644
--- a/pom.xml
+++ b/pom.xml
@@ -22,7 +22,7 @@
   <artifactId>log4j</artifactId>
   <packaging>pom</packaging>
   <name>Apache Log4j 2</name>
-  <version>2.1</version>
+  <version>2.2-SNAPSHOT</version>
   <parent>
     <groupId>org.apache</groupId>
     <artifactId>apache</artifactId>
@@ -145,7 +145,7 @@
     <connection>scm:git:http://git-wip-us.apache.org/repos/asf/logging-log4j2.git</connection>
     <developerConnection>scm:git:https://git-wip-us.apache.org/repos/asf/logging-log4j2.git</developerConnection>
     <url>https://git-wip-us.apache.org/repos/asf?p=logging-log4j2.git;a=summary</url>
-    <tag>log4j-2.1</tag>
+    <tag>HEAD</tag>
   </scm>
   <organization>
     <name>Apache Software Foundation</name>