diff --git a/biojava-aa-prop/pom.xml b/biojava-aa-prop/pom.xml
index 56992a067a..2abf1a64ce 100644
--- a/biojava-aa-prop/pom.xml
+++ b/biojava-aa-prop/pom.xml
@@ -2,7 +2,7 @@
 	<parent>
 		<artifactId>biojava</artifactId>
 		<groupId>org.biojava</groupId>
-		<version>4.2.1</version>
+		<version>4.2.1-SNAPSHOT</version>
 	</parent>
 	<modelVersion>4.0.0</modelVersion>
 	<artifactId>biojava-aa-prop</artifactId>
@@ -70,12 +70,12 @@
 		<dependency>
 			<groupId>org.biojava</groupId>
 			<artifactId>biojava-core</artifactId>
-			<version>4.2.1</version>
+			<version>4.2.1-SNAPSHOT</version>
 		</dependency>
 		<dependency>
 			<groupId>org.biojava</groupId>
 			<artifactId>biojava-structure</artifactId>
-			<version>4.2.1</version>
+			<version>4.2.1-SNAPSHOT</version>
 		</dependency>
 
 		<!-- logging dependencies (managed by parent pom, don't set versions or scopes here) -->
diff --git a/biojava-alignment/pom.xml b/biojava-alignment/pom.xml
index 99133e7a97..128baf980a 100644
--- a/biojava-alignment/pom.xml
+++ b/biojava-alignment/pom.xml
@@ -4,7 +4,7 @@
 	<parent>
 		<artifactId>biojava</artifactId>
 		<groupId>org.biojava</groupId>
-		<version>4.2.1</version>
+		<version>4.2.1-SNAPSHOT</version>
 	</parent>
 	<artifactId>biojava-alignment</artifactId>
 	<name>biojava-alignment</name>
@@ -46,7 +46,7 @@
 		<dependency>
 			<groupId>org.biojava</groupId>
 			<artifactId>biojava-core</artifactId>
-			<version>4.2.1</version>
+			<version>4.2.1-SNAPSHOT</version>
 			<scope>compile</scope>
 		</dependency>
 		<dependency>
@@ -74,7 +74,7 @@
   		<dependency>
   			<groupId>org.biojava</groupId>
   			<artifactId>biojava-phylo</artifactId>
-  			<version>4.2.1</version>
+  			<version>4.2.1-SNAPSHOT</version>
   		</dependency>
 	</dependencies>
 </project>
diff --git a/biojava-core/pom.xml b/biojava-core/pom.xml
index d5f45ef45b..e251cb1bac 100644
--- a/biojava-core/pom.xml
+++ b/biojava-core/pom.xml
@@ -3,7 +3,7 @@
 	<parent>
 		<artifactId>biojava</artifactId>
 		<groupId>org.biojava</groupId>
-		<version>4.2.1</version>
+		<version>4.2.1-SNAPSHOT</version>
 	</parent>
 	<modelVersion>4.0.0</modelVersion>
 	<artifactId>biojava-core</artifactId>
diff --git a/biojava-genome/pom.xml b/biojava-genome/pom.xml
index 5ca7be55b6..df5e7d5e98 100644
--- a/biojava-genome/pom.xml
+++ b/biojava-genome/pom.xml
@@ -3,7 +3,7 @@
 	<parent>
 		<artifactId>biojava</artifactId>
 		<groupId>org.biojava</groupId>
-		<version>4.2.1</version>
+		<version>4.2.1-SNAPSHOT</version>
 	</parent>
 	<modelVersion>4.0.0</modelVersion>
 	<artifactId>biojava-genome</artifactId>
@@ -79,13 +79,13 @@
 		<dependency>
 			<groupId>org.biojava</groupId>
 			<artifactId>biojava-core</artifactId>
-			<version>4.2.1</version>
+			<version>4.2.1-SNAPSHOT</version>
 			<scope>compile</scope>
 		</dependency>
 		<dependency>
 			<groupId>org.biojava</groupId>
 			<artifactId>biojava-alignment</artifactId>
-			<version>4.2.1</version>
+			<version>4.2.1-SNAPSHOT</version>
 			<scope>compile</scope>
 		</dependency>
 		<dependency>
diff --git a/biojava-integrationtest/pom.xml b/biojava-integrationtest/pom.xml
index c269db8521..afb90af6cc 100644
--- a/biojava-integrationtest/pom.xml
+++ b/biojava-integrationtest/pom.xml
@@ -4,7 +4,7 @@
   <parent>
     <artifactId>biojava</artifactId>
     <groupId>org.biojava</groupId>
-    <version>4.2.1</version>
+    <version>4.2.1-SNAPSHOT</version>
   </parent>
   <artifactId>biojava-integrationtest</artifactId>
   <packaging>jar</packaging>
@@ -32,7 +32,7 @@
     <dependency>
     	<groupId>org.biojava</groupId>
     	<artifactId>biojava-structure</artifactId>
-    	<version>4.2.1</version>
+    	<version>4.2.1-SNAPSHOT</version>
     </dependency>
 		<!-- logging dependencies (managed by parent pom, don't set versions or scopes here) -->
 		<dependency>
diff --git a/biojava-modfinder/pom.xml b/biojava-modfinder/pom.xml
index eda4cc2aae..9e5c3c47fc 100644
--- a/biojava-modfinder/pom.xml
+++ b/biojava-modfinder/pom.xml
@@ -4,7 +4,7 @@
   <parent>
     <artifactId>biojava</artifactId>
     <groupId>org.biojava</groupId>
-    <version>4.2.1</version>
+    <version>4.2.1-SNAPSHOT</version>
   </parent>
   <artifactId>biojava-modfinder</artifactId>
   <name>biojava-modfinder</name>
@@ -31,7 +31,7 @@
     <dependency>
     	<groupId>org.biojava</groupId>
     	<artifactId>biojava-structure</artifactId>
-    	<version>4.2.1</version>
+    	<version>4.2.1-SNAPSHOT</version>
     	<type>jar</type>
     	<scope>compile</scope>
     </dependency>
diff --git a/biojava-ontology/pom.xml b/biojava-ontology/pom.xml
index d6558f3875..e14307a9a0 100644
--- a/biojava-ontology/pom.xml
+++ b/biojava-ontology/pom.xml
@@ -4,7 +4,7 @@
   <parent>
     <groupId>org.biojava</groupId>
     <artifactId>biojava</artifactId>
-    <version>4.2.1</version>
+    <version>4.2.1-SNAPSHOT</version>
   </parent>
 
   <artifactId>biojava-ontology</artifactId>
diff --git a/biojava-phylo/pom.xml b/biojava-phylo/pom.xml
index 650a14d4f6..cc85f2809f 100644
--- a/biojava-phylo/pom.xml
+++ b/biojava-phylo/pom.xml
@@ -3,7 +3,7 @@
   <parent>
     <artifactId>biojava</artifactId>
     <groupId>org.biojava</groupId>
-    <version>4.2.1</version>
+    <version>4.2.1-SNAPSHOT</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
   <artifactId>biojava-phylo</artifactId>
@@ -44,7 +44,7 @@
     <dependency>
       <groupId>org.biojava</groupId>
       <artifactId>biojava-core</artifactId>
-      <version>4.2.1</version>
+      <version>4.2.1-SNAPSHOT</version>
       <scope>compile</scope>
     </dependency>
     <dependency>
diff --git a/biojava-protein-disorder/pom.xml b/biojava-protein-disorder/pom.xml
index 5a1283acba..5c32781aa9 100644
--- a/biojava-protein-disorder/pom.xml
+++ b/biojava-protein-disorder/pom.xml
@@ -3,7 +3,7 @@
 	<parent>
 		<artifactId>biojava</artifactId>
 		<groupId>org.biojava</groupId>
-		<version>4.2.1</version>
+		<version>4.2.1-SNAPSHOT</version>
 	</parent>
 	<artifactId>biojava-protein-disorder</artifactId>
 	<packaging>jar</packaging>
@@ -63,7 +63,7 @@
 		<dependency>
 			<groupId>org.biojava</groupId>
 			<artifactId>biojava-core</artifactId>
-			<version>4.2.1</version>
+			<version>4.2.1-SNAPSHOT</version>
 		</dependency>
 		<!-- logging dependencies (managed by parent pom, don't set versions or 
 			scopes here) -->
diff --git a/biojava-sequencing/pom.xml b/biojava-sequencing/pom.xml
index 16f7b04040..eb332ae145 100644
--- a/biojava-sequencing/pom.xml
+++ b/biojava-sequencing/pom.xml
@@ -3,7 +3,7 @@
 	<parent>
 		<artifactId>biojava</artifactId>
 		<groupId>org.biojava</groupId>
-		<version>4.2.1</version>
+		<version>4.2.1-SNAPSHOT</version>
 	</parent>
 	<modelVersion>4.0.0</modelVersion>
 	<artifactId>biojava-sequencing</artifactId>
@@ -47,7 +47,7 @@
 		<dependency>
 			<groupId>org.biojava</groupId>
 			<artifactId>biojava-core</artifactId>
-			<version>4.2.1</version>
+			<version>4.2.1-SNAPSHOT</version>
 			<scope>compile</scope>
 		</dependency>
 		<!-- logging dependencies (managed by parent pom, don't set versions or scopes here) -->
diff --git a/biojava-structure-gui/pom.xml b/biojava-structure-gui/pom.xml
index cb01913352..4342858fed 100644
--- a/biojava-structure-gui/pom.xml
+++ b/biojava-structure-gui/pom.xml
@@ -3,7 +3,7 @@
     <parent>
         <artifactId>biojava</artifactId>
         <groupId>org.biojava</groupId>
-        <version>4.2.1</version>
+        <version>4.2.1-SNAPSHOT</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <artifactId>biojava-structure-gui</artifactId>
@@ -25,13 +25,13 @@
         <dependency>
             <groupId>org.biojava</groupId>
             <artifactId>biojava-structure</artifactId>
-            <version>4.2.1</version>
+            <version>4.2.1-SNAPSHOT</version>
             <scope>compile</scope>
         </dependency>
         <dependency>
             <groupId>org.biojava</groupId>
             <artifactId>biojava-core</artifactId>
-            <version>4.2.1</version>
+            <version>4.2.1-SNAPSHOT</version>
             <scope>compile</scope>
         </dependency>
 
diff --git a/biojava-structure/pom.xml b/biojava-structure/pom.xml
index 31c3cddc03..ecbf5df677 100644
--- a/biojava-structure/pom.xml
+++ b/biojava-structure/pom.xml
@@ -4,7 +4,7 @@
 	<parent>
 		<artifactId>biojava</artifactId>
 		<groupId>org.biojava</groupId>
-		<version>4.2.1</version>
+		<version>4.2.1-SNAPSHOT</version>
 	</parent>
 	<artifactId>biojava-structure</artifactId>
 	<name>biojava-structure</name>
@@ -22,13 +22,13 @@
 		<dependency>
 			<groupId>org.biojava</groupId>
 			<artifactId>biojava-alignment</artifactId>
-			<version>4.2.1</version>
+			<version>4.2.1-SNAPSHOT</version>
 			<scope>compile</scope>
 		</dependency>
 		<dependency>
 			<groupId>org.biojava</groupId>
 			<artifactId>biojava-core</artifactId>
-			<version>4.2.1</version>
+			<version>4.2.1-SNAPSHOT</version>
 			<scope>compile</scope>
 		</dependency>
 
diff --git a/biojava-survival/pom.xml b/biojava-survival/pom.xml
index 5bffa2139e..6a686e0e3d 100644
--- a/biojava-survival/pom.xml
+++ b/biojava-survival/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.biojava</groupId>
         <artifactId>biojava</artifactId>
-        <version>4.2.1</version>
+        <version>4.2.1-SNAPSHOT</version>
     </parent>
 
     <artifactId>biojava-survival</artifactId>
diff --git a/biojava-ws/pom.xml b/biojava-ws/pom.xml
index 9d643a2368..d124d0ce5a 100644
--- a/biojava-ws/pom.xml
+++ b/biojava-ws/pom.xml
@@ -3,7 +3,7 @@
 	<parent>
 		<artifactId>biojava</artifactId>
 		<groupId>org.biojava</groupId>
-		<version>4.2.1</version>
+		<version>4.2.1-SNAPSHOT</version>
 	</parent>	
 	<artifactId>biojava-ws</artifactId>
 	<name>biojava-ws</name>
@@ -19,7 +19,7 @@
 		<dependency>
 			<groupId>org.biojava</groupId>
 			<artifactId>biojava-core</artifactId>
-			<version>4.2.1</version>
+			<version>4.2.1-SNAPSHOT</version>
 			<scope>compile</scope>
 		</dependency>
 		<dependency>
diff --git a/pom.xml b/pom.xml
index 330c0798a3..dd5a3de4b6 100644
--- a/pom.xml
+++ b/pom.xml
@@ -12,7 +12,7 @@
 	<groupId>org.biojava</groupId>
 	<artifactId>biojava</artifactId>
 	<packaging>pom</packaging>
-	<version>4.2.1</version>
+	<version>4.2.1-SNAPSHOT</version>
 	<name>biojava</name>
 	<description>BioJava is an open-source project dedicated to providing a Java framework for processing biological
         data. It provides analytical and statistical routines, parsers for common file formats and allows the