diff --git a/core-lib/es5/pom.xml b/core-lib/es5/pom.xml
index 49724831..ec2fcb30 100644
--- a/core-lib/es5/pom.xml
+++ b/core-lib/es5/pom.xml
@@ -99,26 +99,6 @@
 					</execution>
 				</executions>
 			</plugin>
-
-			<plugin>
-				<groupId>org.apache.maven.plugins</groupId>
-				<artifactId>maven-gpg-plugin</artifactId>
-				<version>1.6</version>
-				<configuration>
-					<skip>${skipSigning}</skip>
-
-				</configuration>
-				<executions>
-					<execution>
-						<id>sign-artifacts</id>
-						<phase>verify</phase>
-						<goals>
-							<goal>sign</goal>
-						</goals>
-					</execution>
-				</executions>
-			</plugin>
-
 		</plugins>
 		<pluginManagement>
 			<plugins>
@@ -152,6 +132,68 @@
 		</pluginManagement>
 	</build>
 
+    <profiles>
+        <profile>
+            <id>signed</id>
+            <activation>
+                <property>
+                    <name>signed</name>
+                </property>
+            </activation>
+            <build>
+                <plugins>
+                    <plugin>
+                        <groupId>org.apache.maven.plugins</groupId>
+                        <artifactId>maven-gpg-plugin</artifactId>
+                        <version>1.6</version>
+                        <configuration>
+                            <skip>${skipSigning}</skip>
+                        </configuration>
+                        <executions>
+                            <execution>
+                                <id>sign-artifacts</id>
+                                <phase>verify</phase>
+                                <goals>
+                                    <goal>sign</goal>
+                                </goals>
+                            </execution>
+                        </executions>
+                    </plugin>
+                </plugins>
+            </build>
+        </profile>
+        <profile>
+            <id>use-snapshots</id>
+            <activation>
+                <property>
+                    <name>use-snapshots</name>
+                </property>
+            </activation>
+            <repositories>
+                <repository>
+                    <id>snapshots-repo</id>
+                    <url>https://oss.sonatype.org/content/repositories/snapshots</url>
+                    <releases>
+                        <enabled>false</enabled>
+                    </releases>
+                    <snapshots>
+                        <enabled>true</enabled>
+                    </snapshots>
+                </repository>
+            </repositories>
+            <pluginRepositories>
+                <pluginRepository>
+                    <id>apache.snapshots</id>
+                    <url>https://repository.apache.org/snapshots/</url>
+                </pluginRepository>
+                <pluginRepository>
+                    <id>sonatype.snapshots</id>
+                    <url>https://oss.sonatype.org/content/repositories/snapshots</url>
+                </pluginRepository>
+            </pluginRepositories>
+        </profile>
+    </profiles>
+
 	<distributionManagement>
 		<repository>
 			<id>jsweet-release</id>
diff --git a/core-lib/es6/pom.xml b/core-lib/es6/pom.xml
index 752dbb33..3548007c 100644
--- a/core-lib/es6/pom.xml
+++ b/core-lib/es6/pom.xml
@@ -166,24 +166,6 @@
 					</execution>
 				</executions>
 			</plugin>
-
-			<plugin>
-				<groupId>org.apache.maven.plugins</groupId>
-				<artifactId>maven-gpg-plugin</artifactId>
-				<version>1.6</version>
-				<configuration>
-					<skip>${skipSigning}</skip>
-				</configuration>
-				<executions>
-					<execution>
-						<id>sign-artifacts</id>
-						<phase>verify</phase>
-						<goals>
-							<goal>sign</goal>
-						</goals>
-					</execution>
-				</executions>
-			</plugin>
 		</plugins>
 
 		<pluginManagement>
@@ -223,6 +205,69 @@
 			</plugins>
 		</pluginManagement>
 	</build>
+
+    <profiles>
+        <profile>
+            <id>signed</id>
+            <activation>
+                <property>
+                    <name>signed</name>
+                </property>
+            </activation>
+            <build>
+                <plugins>
+                    <plugin>
+                        <groupId>org.apache.maven.plugins</groupId>
+                        <artifactId>maven-gpg-plugin</artifactId>
+                        <version>1.6</version>
+                        <configuration>
+                            <skip>${skipSigning}</skip>
+                        </configuration>
+                        <executions>
+                            <execution>
+                                <id>sign-artifacts</id>
+                                <phase>verify</phase>
+                                <goals>
+                                    <goal>sign</goal>
+                                </goals>
+                            </execution>
+                        </executions>
+                    </plugin>
+                </plugins>
+            </build>
+        </profile>
+        <profile>
+            <id>use-snapshots</id>
+            <activation>
+                <property>
+                    <name>use-snapshots</name>
+                </property>
+            </activation>
+            <repositories>
+                <repository>
+                    <id>snapshots-repo</id>
+                    <url>https://oss.sonatype.org/content/repositories/snapshots</url>
+                    <releases>
+                        <enabled>false</enabled>
+                    </releases>
+                    <snapshots>
+                        <enabled>true</enabled>
+                    </snapshots>
+                </repository>
+            </repositories>
+            <pluginRepositories>
+                <pluginRepository>
+                    <id>apache.snapshots</id>
+                    <url>https://repository.apache.org/snapshots/</url>
+                </pluginRepository>
+                <pluginRepository>
+                    <id>sonatype.snapshots</id>
+                    <url>https://oss.sonatype.org/content/repositories/snapshots</url>
+                </pluginRepository>
+            </pluginRepositories>
+        </profile>
+    </profiles>
+
 	<distributionManagement>
 		<repository>
 			<id>jsweet-release</id>