diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1c4033c826..9610b211df 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,11 @@
 BioJava Changelog
 -----------------
 
+BioJava 7.2.4
+==============================
+### Fixed
+* Edge case in quaternary symmetry calculation #1120
+
 BioJava 7.2.3
 ==============================
 ### Fixed
diff --git a/README.md b/README.md
index da352ee3f2..eddeb65379 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 # Welcome to <img src="logo-full.png" height="35"/>
 
 ![Build](https://github.com/biojava/biojava/actions/workflows/master.yml/badge.svg)
-[![Version](http://img.shields.io/badge/version-7.2.3-blue.svg?style=flat)](https://github.com/biojava/biojava/releases/tag/biojava-7.2.3) [![License](http://img.shields.io/badge/license-LGPL_2.1-blue.svg?style=flat)](https://github.com/biojava/biojava/blob/master/LICENSE) [![Join the chat at https://gitter.im/biojava/biojava](https://badges.gitter.im/biojava/biojava.svg)](https://gitter.im/biojava/biojava?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+[![Version](http://img.shields.io/badge/version-7.2.4-blue.svg?style=flat)](https://github.com/biojava/biojava/releases/tag/biojava-7.2.4) [![License](http://img.shields.io/badge/license-LGPL_2.1-blue.svg?style=flat)](https://github.com/biojava/biojava/blob/master/LICENSE) [![Join the chat at https://gitter.im/biojava/biojava](https://badges.gitter.im/biojava/biojava.svg)](https://gitter.im/biojava/biojava?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 
 
 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, reference implementations of popular algorithms, and allows the manipulation of sequences and 3D structures. The goal of the biojava project is to facilitate rapid application development for bioinformatics.
@@ -29,7 +29,7 @@ If you are using Maven you can add the BioJava repository by adding the followin
       <dependency>
         <groupId>org.biojava</groupId>
         <artifactId>biojava-core</artifactId>
-        <version>7.2.3</version>
+        <version>7.2.4</version>
       </dependency>
       <!-- other biojava modules as needed -->
     </dependencies>
diff --git a/biojava-aa-prop/pom.xml b/biojava-aa-prop/pom.xml
index b1efc6c661..cbc82fff7b 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>7.2.4</version>
+		<version>7.2.5-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>7.2.4</version>
+			<version>7.2.5-SNAPSHOT</version>
 		</dependency>
 		<dependency>
 			<groupId>org.biojava</groupId>
 			<artifactId>biojava-structure</artifactId>
-			<version>7.2.4</version>
+			<version>7.2.5-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 a03519aeca..b1d0bd9097 100644
--- a/biojava-alignment/pom.xml
+++ b/biojava-alignment/pom.xml
@@ -4,7 +4,7 @@
 	<parent>
 		<artifactId>biojava</artifactId>
 		<groupId>org.biojava</groupId>
-		<version>7.2.4</version>
+		<version>7.2.5-SNAPSHOT</version>
 	</parent>
 	<artifactId>biojava-alignment</artifactId>
 	<name>biojava-alignment</name>
@@ -47,7 +47,7 @@
 		<dependency>
 			<groupId>org.biojava</groupId>
 			<artifactId>biojava-core</artifactId>
-			<version>7.2.4</version>
+			<version>7.2.5-SNAPSHOT</version>
 			<scope>compile</scope>
 		</dependency>
 		<dependency>
diff --git a/biojava-core/pom.xml b/biojava-core/pom.xml
index e7f36a646d..909f46f088 100644
--- a/biojava-core/pom.xml
+++ b/biojava-core/pom.xml
@@ -3,7 +3,7 @@
 	<parent>
 		<artifactId>biojava</artifactId>
 		<groupId>org.biojava</groupId>
-		<version>7.2.4</version>
+		<version>7.2.5-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 b4e2a0e791..68575bbb9b 100644
--- a/biojava-genome/pom.xml
+++ b/biojava-genome/pom.xml
@@ -3,7 +3,7 @@
 	<parent>
 		<artifactId>biojava</artifactId>
 		<groupId>org.biojava</groupId>
-		<version>7.2.4</version>
+		<version>7.2.5-SNAPSHOT</version>
 	</parent>
 	<modelVersion>4.0.0</modelVersion>
 	<artifactId>biojava-genome</artifactId>
@@ -70,13 +70,13 @@
 		<dependency>
 			<groupId>org.biojava</groupId>
 			<artifactId>biojava-core</artifactId>
-			<version>7.2.4</version>
+			<version>7.2.5-SNAPSHOT</version>
 			<scope>compile</scope>
 		</dependency>
 		<dependency>
 			<groupId>org.biojava</groupId>
 			<artifactId>biojava-alignment</artifactId>
-			<version>7.2.4</version>
+			<version>7.2.5-SNAPSHOT</version>
 			<scope>compile</scope>
 		</dependency>
 		<dependency>
diff --git a/biojava-integrationtest/pom.xml b/biojava-integrationtest/pom.xml
index a5b307c637..1c21373bd1 100644
--- a/biojava-integrationtest/pom.xml
+++ b/biojava-integrationtest/pom.xml
@@ -4,7 +4,7 @@
   <parent>
     <artifactId>biojava</artifactId>
     <groupId>org.biojava</groupId>
-    <version>7.2.4</version>
+    <version>7.2.5-SNAPSHOT</version>
   </parent>
   <artifactId>biojava-integrationtest</artifactId>
   <packaging>jar</packaging>
@@ -40,7 +40,7 @@
     <dependency>
     	<groupId>org.biojava</groupId>
     	<artifactId>biojava-structure</artifactId>
-    	<version>7.2.4</version>
+    	<version>7.2.5-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 4545d15f2f..e8de9e38d9 100644
--- a/biojava-modfinder/pom.xml
+++ b/biojava-modfinder/pom.xml
@@ -4,7 +4,7 @@
 	<parent>
 		<artifactId>biojava</artifactId>
 		<groupId>org.biojava</groupId>
-		<version>7.2.4</version>
+		<version>7.2.5-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>7.2.4</version>
+			<version>7.2.5-SNAPSHOT</version>
 			<type>jar</type>
 			<scope>compile</scope>
 		</dependency>
diff --git a/biojava-ontology/pom.xml b/biojava-ontology/pom.xml
index 82ccc0ed59..6a3fd5cbc4 100644
--- a/biojava-ontology/pom.xml
+++ b/biojava-ontology/pom.xml
@@ -4,7 +4,7 @@
   <parent>
     <groupId>org.biojava</groupId>
     <artifactId>biojava</artifactId>
-    <version>7.2.4</version>
+    <version>7.2.5-SNAPSHOT</version>
   </parent>
 
   <artifactId>biojava-ontology</artifactId>
diff --git a/biojava-protein-comparison-tool/pom.xml b/biojava-protein-comparison-tool/pom.xml
index 3425644447..cf8cd570a7 100644
--- a/biojava-protein-comparison-tool/pom.xml
+++ b/biojava-protein-comparison-tool/pom.xml
@@ -4,7 +4,7 @@
 	<parent>
 		<artifactId>biojava</artifactId>
 		<groupId>org.biojava</groupId>
-		<version>7.2.4</version>
+		<version>7.2.5-SNAPSHOT</version>
 	</parent>
 
 	<artifactId>biojava-protein-comparison-tool</artifactId>
@@ -36,23 +36,23 @@
 		<dependency>
 			<groupId>org.biojava</groupId>
 			<artifactId>biojava-alignment</artifactId>
-			<version>7.2.4</version>
+			<version>7.2.5-SNAPSHOT</version>
 
 		</dependency>
 		<dependency>
 			<groupId>org.biojava</groupId>
 			<artifactId>biojava-core</artifactId>
-			<version>7.2.4</version>
+			<version>7.2.5-SNAPSHOT</version>
 		</dependency>
 		<dependency>
 			<groupId>org.biojava</groupId>
 			<artifactId>biojava-structure</artifactId>
-			<version>7.2.4</version>
+			<version>7.2.5-SNAPSHOT</version>
 		</dependency>
 		<dependency>
 			<groupId>org.biojava</groupId>
 			<artifactId>biojava-structure-gui</artifactId>
-			<version>7.2.4</version>
+			<version>7.2.5-SNAPSHOT</version>
 		</dependency>
 		<dependency>
 			<groupId>net.sourceforge.jmol</groupId>
diff --git a/biojava-protein-disorder/pom.xml b/biojava-protein-disorder/pom.xml
index 30c263b398..7273bbff8f 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>7.2.4</version>
+		<version>7.2.5-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>7.2.4</version>
+			<version>7.2.5-SNAPSHOT</version>
 		</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 133f64781c..581b8a53cc 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>7.2.4</version>
+		<version>7.2.5-SNAPSHOT</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <artifactId>biojava-structure-gui</artifactId>
@@ -27,13 +27,13 @@
         <dependency>
             <groupId>org.biojava</groupId>
             <artifactId>biojava-structure</artifactId>
-			<version>7.2.4</version>
+			<version>7.2.5-SNAPSHOT</version>
             <scope>compile</scope>
         </dependency>
         <dependency>
             <groupId>org.biojava</groupId>
             <artifactId>biojava-core</artifactId>
-			<version>7.2.4</version>
+			<version>7.2.5-SNAPSHOT</version>
             <scope>compile</scope>
         </dependency>
 
diff --git a/biojava-structure/pom.xml b/biojava-structure/pom.xml
index b58fda9a96..7fbc64a3c1 100644
--- a/biojava-structure/pom.xml
+++ b/biojava-structure/pom.xml
@@ -4,7 +4,7 @@
 	<parent>
 		<artifactId>biojava</artifactId>
 		<groupId>org.biojava</groupId>
-		<version>7.2.4</version>
+		<version>7.2.5-SNAPSHOT</version>
 	</parent>
 	<artifactId>biojava-structure</artifactId>
 	<name>biojava-structure</name>
@@ -51,13 +51,13 @@
 		<dependency>
 			<groupId>org.biojava</groupId>
 			<artifactId>biojava-alignment</artifactId>
-			<version>7.2.4</version>
+			<version>7.2.5-SNAPSHOT</version>
 			<scope>compile</scope>
 		</dependency>
 		<dependency>
 			<groupId>org.biojava</groupId>
 			<artifactId>biojava-core</artifactId>
-			<version>7.2.4</version>
+			<version>7.2.5-SNAPSHOT</version>
 			<scope>compile</scope>
 		</dependency>
 
diff --git a/biojava-survival/pom.xml b/biojava-survival/pom.xml
index 993b9aa1fe..88f901cdea 100644
--- a/biojava-survival/pom.xml
+++ b/biojava-survival/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.biojava</groupId>
         <artifactId>biojava</artifactId>
-        <version>7.2.4</version>
+        <version>7.2.5-SNAPSHOT</version>
     </parent>
 
     <artifactId>biojava-survival</artifactId>
diff --git a/biojava-ws/pom.xml b/biojava-ws/pom.xml
index 32a8af0fb4..7e960b4445 100644
--- a/biojava-ws/pom.xml
+++ b/biojava-ws/pom.xml
@@ -3,7 +3,7 @@
 	<parent>
 		<artifactId>biojava</artifactId>
 		<groupId>org.biojava</groupId>
-		<version>7.2.4</version>
+		<version>7.2.5-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>7.2.4</version>
+			<version>7.2.5-SNAPSHOT</version>
 			<scope>compile</scope>
 		</dependency>
 		<dependency>
diff --git a/pom.xml b/pom.xml
index 0cd4634a92..e9f246202b 100644
--- a/pom.xml
+++ b/pom.xml
@@ -12,7 +12,7 @@
 	<groupId>org.biojava</groupId>
 	<artifactId>biojava</artifactId>
 	<packaging>pom</packaging>
-	<version>7.2.4</version>
+	<version>7.2.5-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
@@ -51,7 +51,7 @@
 		<developerConnection>scm:git:git@github.com:biojava/biojava.git</developerConnection>
 		<url>https://github.com/biojava/biojava</url>
 
-		<tag>biojava-7.2.4</tag>
+		<tag>HEAD</tag>
 	</scm>
 
 	<!-- This section required for release at Maven Central. For a full list