diff --git a/pmml-sklearn-example/pom.xml b/pmml-sklearn-example/pom.xml
index 42ea48ad1..ca1eface4 100644
--- a/pmml-sklearn-example/pom.xml
+++ b/pmml-sklearn-example/pom.xml
@@ -5,7 +5,7 @@
 	<parent>
 		<groupId>org.jpmml</groupId>
 		<artifactId>jpmml-sklearn</artifactId>
-		<version>1.8-SNAPSHOT</version>
+		<version>1.8.1</version>
 	</parent>
 
 	<groupId>org.jpmml</groupId>
@@ -24,7 +24,7 @@
 	</licenses>
 
 	<properties>
-		<project.build.outputTimestamp>2024-04-20T10:35:24Z</project.build.outputTimestamp>
+		<project.build.outputTimestamp>2024-04-25T03:33:46Z</project.build.outputTimestamp>
 	</properties>
 
 	<dependencies>
diff --git a/pmml-sklearn-extension/pom.xml b/pmml-sklearn-extension/pom.xml
index 2bd4b8dcb..fca130440 100644
--- a/pmml-sklearn-extension/pom.xml
+++ b/pmml-sklearn-extension/pom.xml
@@ -5,7 +5,7 @@
 	<parent>
 		<groupId>org.jpmml</groupId>
 		<artifactId>jpmml-sklearn</artifactId>
-		<version>1.8-SNAPSHOT</version>
+		<version>1.8.1</version>
 	</parent>
 
 	<groupId>org.jpmml</groupId>
@@ -24,7 +24,7 @@
 	</licenses>
 
 	<properties>
-		<project.build.outputTimestamp>2024-04-20T10:35:24Z</project.build.outputTimestamp>
+		<project.build.outputTimestamp>2024-04-25T03:33:46Z</project.build.outputTimestamp>
 	</properties>
 
 	<dependencies>
diff --git a/pmml-sklearn-h2o/pom.xml b/pmml-sklearn-h2o/pom.xml
index 2c1ebdeee..b79c476fa 100644
--- a/pmml-sklearn-h2o/pom.xml
+++ b/pmml-sklearn-h2o/pom.xml
@@ -5,7 +5,7 @@
 	<parent>
 		<groupId>org.jpmml</groupId>
 		<artifactId>jpmml-sklearn</artifactId>
-		<version>1.8-SNAPSHOT</version>
+		<version>1.8.1</version>
 	</parent>
 
 	<groupId>org.jpmml</groupId>
@@ -24,7 +24,7 @@
 	</licenses>
 
 	<properties>
-		<project.build.outputTimestamp>2024-04-20T10:35:24Z</project.build.outputTimestamp>
+		<project.build.outputTimestamp>2024-04-25T03:33:46Z</project.build.outputTimestamp>
 	</properties>
 
 	<dependencies>
diff --git a/pmml-sklearn-lightgbm/pom.xml b/pmml-sklearn-lightgbm/pom.xml
index 081706ccf..91fae278f 100644
--- a/pmml-sklearn-lightgbm/pom.xml
+++ b/pmml-sklearn-lightgbm/pom.xml
@@ -5,7 +5,7 @@
 	<parent>
 		<groupId>org.jpmml</groupId>
 		<artifactId>jpmml-sklearn</artifactId>
-		<version>1.8-SNAPSHOT</version>
+		<version>1.8.1</version>
 	</parent>
 
 	<groupId>org.jpmml</groupId>
@@ -24,7 +24,7 @@
 	</licenses>
 
 	<properties>
-		<project.build.outputTimestamp>2024-04-20T10:35:24Z</project.build.outputTimestamp>
+		<project.build.outputTimestamp>2024-04-25T03:33:46Z</project.build.outputTimestamp>
 	</properties>
 
 	<dependencies>
diff --git a/pmml-sklearn-statsmodels/pom.xml b/pmml-sklearn-statsmodels/pom.xml
index 71fe99dac..d5734bf98 100644
--- a/pmml-sklearn-statsmodels/pom.xml
+++ b/pmml-sklearn-statsmodels/pom.xml
@@ -5,7 +5,7 @@
 	<parent>
 		<groupId>org.jpmml</groupId>
 		<artifactId>jpmml-sklearn</artifactId>
-		<version>1.8-SNAPSHOT</version>
+		<version>1.8.1</version>
 	</parent>
 
 	<groupId>org.jpmml</groupId>
@@ -24,7 +24,7 @@
 	</licenses>
 
 	<properties>
-		<project.build.outputTimestamp>2024-04-20T10:35:24Z</project.build.outputTimestamp>
+		<project.build.outputTimestamp>2024-04-25T03:33:46Z</project.build.outputTimestamp>
 	</properties>
 
 	<dependencies>
diff --git a/pmml-sklearn-xgboost/pom.xml b/pmml-sklearn-xgboost/pom.xml
index c90746314..5f7a68baa 100644
--- a/pmml-sklearn-xgboost/pom.xml
+++ b/pmml-sklearn-xgboost/pom.xml
@@ -5,7 +5,7 @@
 	<parent>
 		<groupId>org.jpmml</groupId>
 		<artifactId>jpmml-sklearn</artifactId>
-		<version>1.8-SNAPSHOT</version>
+		<version>1.8.1</version>
 	</parent>
 
 	<groupId>org.jpmml</groupId>
@@ -24,7 +24,7 @@
 	</licenses>
 
 	<properties>
-		<project.build.outputTimestamp>2024-04-20T10:35:24Z</project.build.outputTimestamp>
+		<project.build.outputTimestamp>2024-04-25T03:33:46Z</project.build.outputTimestamp>
 	</properties>
 
 	<dependencies>
diff --git a/pmml-sklearn/pom.xml b/pmml-sklearn/pom.xml
index 0bc13b8e0..0070f0b15 100644
--- a/pmml-sklearn/pom.xml
+++ b/pmml-sklearn/pom.xml
@@ -5,7 +5,7 @@
 	<parent>
 		<groupId>org.jpmml</groupId>
 		<artifactId>jpmml-sklearn</artifactId>
-		<version>1.8-SNAPSHOT</version>
+		<version>1.8.1</version>
 	</parent>
 
 	<groupId>org.jpmml</groupId>
@@ -24,7 +24,7 @@
 	</licenses>
 
 	<properties>
-		<project.build.outputTimestamp>2024-04-20T10:35:24Z</project.build.outputTimestamp>
+		<project.build.outputTimestamp>2024-04-25T03:33:46Z</project.build.outputTimestamp>
 	</properties>
 
 	<dependencies>
diff --git a/pom.xml b/pom.xml
index 1c050d551..e0c1b31a8 100644
--- a/pom.xml
+++ b/pom.xml
@@ -10,7 +10,7 @@
 
 	<groupId>org.jpmml</groupId>
 	<artifactId>jpmml-sklearn</artifactId>
-	<version>1.8-SNAPSHOT</version>
+	<version>1.8.1</version>
 	<packaging>pom</packaging>
 
 	<name>JPMML-SkLearn</name>
@@ -46,7 +46,7 @@
 		<connection>scm:git:git@github.com:jpmml/jpmml-sklearn.git</connection>
 		<developerConnection>scm:git:git@github.com:jpmml/jpmml-sklearn.git</developerConnection>
 		<url>git://github.com/jpmml/jpmml-sklearn.git</url>
-		<tag>HEAD</tag>
+		<tag>1.8.1</tag>
 	</scm>
 	<issueManagement>
 		<system>GitHub</system>
@@ -54,7 +54,7 @@
 	</issueManagement>
 
 	<properties>
-		<project.build.outputTimestamp>2024-04-20T10:35:24Z</project.build.outputTimestamp>
+		<project.build.outputTimestamp>2024-04-25T03:33:46Z</project.build.outputTimestamp>
 	</properties>
 
 	<dependencyManagement>
@@ -62,37 +62,37 @@
 			<dependency>
 				<groupId>org.jpmml</groupId>
 				<artifactId>pmml-sklearn</artifactId>
-				<version>1.8-SNAPSHOT</version>
+				<version>1.8.1</version>
 			</dependency>
 			<dependency>
 				<groupId>org.jpmml</groupId>
 				<artifactId>pmml-sklearn-example</artifactId>
-				<version>1.8-SNAPSHOT</version>
+				<version>1.8.1</version>
 			</dependency>
 			<dependency>
 				<groupId>org.jpmml</groupId>
 				<artifactId>pmml-sklearn-extension</artifactId>
-				<version>1.8-SNAPSHOT</version>
+				<version>1.8.1</version>
 			</dependency>
 			<dependency>
 				<groupId>org.jpmml</groupId>
 				<artifactId>pmml-sklearn-h2o</artifactId>
-				<version>1.8-SNAPSHOT</version>
+				<version>1.8.1</version>
 			</dependency>
 			<dependency>
 				<groupId>org.jpmml</groupId>
 				<artifactId>pmml-sklearn-lightgbm</artifactId>
-				<version>1.8-SNAPSHOT</version>
+				<version>1.8.1</version>
 			</dependency>
 			<dependency>
 				<groupId>org.jpmml</groupId>
 				<artifactId>pmml-sklearn-statsmodels</artifactId>
-				<version>1.8-SNAPSHOT</version>
+				<version>1.8.1</version>
 			</dependency>
 			<dependency>
 				<groupId>org.jpmml</groupId>
 				<artifactId>pmml-sklearn-xgboost</artifactId>
-				<version>1.8-SNAPSHOT</version>
+				<version>1.8.1</version>
 			</dependency>
 
 			<dependency>