diff --git a/pmml-rexp-evaluator/pom.xml b/pmml-rexp-evaluator/pom.xml
index 901ed35..ea4701a 100644
--- a/pmml-rexp-evaluator/pom.xml
+++ b/pmml-rexp-evaluator/pom.xml
@@ -5,7 +5,7 @@
 	<parent>
 		<groupId>org.jpmml</groupId>
 		<artifactId>jpmml-r</artifactId>
-		<version>1.6.4</version>
+		<version>1.6-SNAPSHOT</version>
 	</parent>
 
 	<groupId>org.jpmml</groupId>
diff --git a/pmml-rexp-example/pom.xml b/pmml-rexp-example/pom.xml
index 530787d..e60e3c1 100644
--- a/pmml-rexp-example/pom.xml
+++ b/pmml-rexp-example/pom.xml
@@ -5,7 +5,7 @@
 	<parent>
 		<groupId>org.jpmml</groupId>
 		<artifactId>jpmml-r</artifactId>
-		<version>1.6.4</version>
+		<version>1.6-SNAPSHOT</version>
 	</parent>
 
 	<groupId>org.jpmml</groupId>
diff --git a/pmml-rexp-lightgbm/pom.xml b/pmml-rexp-lightgbm/pom.xml
index 9bfc5d5..8a0b3d8 100644
--- a/pmml-rexp-lightgbm/pom.xml
+++ b/pmml-rexp-lightgbm/pom.xml
@@ -5,7 +5,7 @@
 	<parent>
 		<groupId>org.jpmml</groupId>
 		<artifactId>jpmml-r</artifactId>
-		<version>1.6.4</version>
+		<version>1.6-SNAPSHOT</version>
 	</parent>
 
 	<groupId>org.jpmml</groupId>
diff --git a/pmml-rexp-xgboost/pom.xml b/pmml-rexp-xgboost/pom.xml
index b54538f..68d05cb 100644
--- a/pmml-rexp-xgboost/pom.xml
+++ b/pmml-rexp-xgboost/pom.xml
@@ -5,7 +5,7 @@
 	<parent>
 		<groupId>org.jpmml</groupId>
 		<artifactId>jpmml-r</artifactId>
-		<version>1.6.4</version>
+		<version>1.6-SNAPSHOT</version>
 	</parent>
 
 	<groupId>org.jpmml</groupId>
diff --git a/pmml-rexp/pom.xml b/pmml-rexp/pom.xml
index 4d956d7..0fa9007 100644
--- a/pmml-rexp/pom.xml
+++ b/pmml-rexp/pom.xml
@@ -5,7 +5,7 @@
 	<parent>
 		<groupId>org.jpmml</groupId>
 		<artifactId>jpmml-r</artifactId>
-		<version>1.6.4</version>
+		<version>1.6-SNAPSHOT</version>
 	</parent>
 
 	<groupId>org.jpmml</groupId>
diff --git a/pom.xml b/pom.xml
index d8d1c53..4fa2ca0 100644
--- a/pom.xml
+++ b/pom.xml
@@ -10,7 +10,7 @@
 
 	<groupId>org.jpmml</groupId>
 	<artifactId>jpmml-r</artifactId>
-	<version>1.6.4</version>
+	<version>1.6-SNAPSHOT</version>
 	<packaging>pom</packaging>
 
 	<name>JPMML-R</name>
@@ -44,7 +44,7 @@
 		<connection>scm:git:git@github.com:jpmml/jpmml-r.git</connection>
 		<developerConnection>scm:git:git@github.com:jpmml/jpmml-r.git</developerConnection>
 		<url>git://github.com/jpmml/jpmml-r.git</url>
-		<tag>1.6.4</tag>
+		<tag>HEAD</tag>
 	</scm>
 	<issueManagement>
 		<system>GitHub</system>
@@ -52,7 +52,7 @@
 	</issueManagement>
 
 	<properties>
-		<project.build.outputTimestamp>2024-12-19T19:25:58Z</project.build.outputTimestamp>
+		<project.build.outputTimestamp>2024-12-19T19:27:32Z</project.build.outputTimestamp>
 	</properties>
 
 	<dependencyManagement>
@@ -60,27 +60,27 @@
 			<dependency>
 				<groupId>org.jpmml</groupId>
 				<artifactId>pmml-rexp</artifactId>
-				<version>1.6.4</version>
+				<version>1.6-SNAPSHOT</version>
 			</dependency>
 			<dependency>
 				<groupId>org.jpmml</groupId>
 				<artifactId>pmml-rexp-evaluator</artifactId>
-				<version>1.6.4</version>
+				<version>1.6-SNAPSHOT</version>
 			</dependency>
 			<dependency>
 				<groupId>org.jpmml</groupId>
 				<artifactId>pmml-rexp-example</artifactId>
-				<version>1.6.4</version>
+				<version>1.6-SNAPSHOT</version>
 			</dependency>
 			<dependency>
 				<groupId>org.jpmml</groupId>
 				<artifactId>pmml-rexp-lightgbm</artifactId>
-				<version>1.6.4</version>
+				<version>1.6-SNAPSHOT</version>
 			</dependency>
 			<dependency>
 				<groupId>org.jpmml</groupId>
 				<artifactId>pmml-rexp-xgboost</artifactId>
-				<version>1.6.4</version>
+				<version>1.6-SNAPSHOT</version>
 			</dependency>
 
 			<dependency>