diff --git a/RELEASE-NOTES.md b/RELEASE-NOTES.md
index af4b0f67..e7dc817b 100644
--- a/RELEASE-NOTES.md
+++ b/RELEASE-NOTES.md
@@ -1,20 +1,20 @@
 #              OpenAS2 Server
-#              Version 4.5.0
+#              Version 4.5.1
 #              RELEASE NOTES
 -----
-The OpenAS2 project is pleased to announce the release of OpenAS2 4.5.0
+The OpenAS2 project is pleased to announce the release of OpenAS2 4.5.1
 
-The release download file is: OpenAS2Server-4.5.0.zip
+The release download file is: OpenAS2Server-4.5.1.zip
 
 The zip file contains a PDF document (OpenAS2HowTo.pdf) providing information on installing and using the application.
 ## NOTE: Testing covers Java 11 to 21.
 ##       Java 8 is NO LONGER SUPPORTED.
 
-Version 4.5.0 - 2025-05-10
+Version 4.5.1 - 2025-06-04
 
-This is an enhancement release.
+This is a bugfix release.
 
-1. Add configuration paramerter "resend_on_ssl_exception" to enter into a resend loop when an SSL exception occurs connecting to a partner.
+1. Fix dynamic content-type functionality.
 
 ##Upgrade Notes
  See the openAS2HowTo appendix for the general process on upgrading OpenAS2.
diff --git a/Server/pom.xml b/Server/pom.xml
index 734aa85a..aae4b6f2 100644
--- a/Server/pom.xml
+++ b/Server/pom.xml
@@ -7,7 +7,7 @@
         <!-- DO NOT CHANGE THIS "groupId" WITHOUT CHANGING XMLSession.getManifestAttributes.MANIFEST_VENDOR_ID_ATTRIB -->
         <groupId>net.sf.openas2</groupId>
         <artifactId>OpenAS2</artifactId>
-        <version>4.5.0</version>
+        <version>4.5.1</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
diff --git a/changes.txt b/changes.txt
index 1182de41..0d3a0773 100644
--- a/changes.txt
+++ b/changes.txt
@@ -1,5 +1,12 @@
 **IMPORTANT NOTE**: Please review upgrade notes in the RELEASE-NOTES.md if you are upgrading
 
+Version 4.5.1 - 2025-06-04
+
+This is a bugfix release.
+
+1. Fix dynamic content-type functionality.
+
+
 Version 4.5.0 - 2025-05-18
 
 This is an enhancement release.
diff --git a/pom.xml b/pom.xml
index a0de552a..3506bfd2 100644
--- a/pom.xml
+++ b/pom.xml
@@ -5,7 +5,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>net.sf.openas2</groupId>
     <artifactId>OpenAS2</artifactId>
-    <version>4.5.0</version>
+    <version>4.5.1</version>
     <name>OpenAS2</name>
     <packaging>pom</packaging>
 
@@ -51,17 +51,17 @@
             <dependency>
                 <groupId>org.bouncycastle</groupId>
                 <artifactId>bcjmail-jdk18on</artifactId>
-                <version>1.80</version>
+                <version>1.81</version>
             </dependency>
             <dependency>
                 <groupId>org.bouncycastle</groupId>
                 <artifactId>bcpkix-jdk18on</artifactId>
-                <version>1.80</version>
+                <version>1.81</version>
             </dependency>
             <dependency>
                 <groupId>org.bouncycastle</groupId>
                 <artifactId>bcprov-jdk18on</artifactId>
-                <version>1.80</version>
+                <version>1.81</version>
             </dependency>
             <dependency>
                 <groupId>org.bouncycastle</groupId>
@@ -71,7 +71,7 @@
             <dependency>
                 <groupId>org.bouncycastle</groupId>
                 <artifactId>bcpg-jdk18on</artifactId>
-                <version>1.80</version>
+                <version>1.81</version>
             </dependency>
             <dependency>
                 <groupId>org.apache.commons</groupId>
@@ -108,7 +108,7 @@
             <dependency>
                 <groupId>org.junit.jupiter</groupId>
 		        <artifactId>junit-jupiter</artifactId>
-		        <version>5.12.2</version>
+		        <version>5.13.0</version>
                 <scope>test</scope>
             </dependency>
             <!-- https://mvnrepository.com/artifact/org.mockito/mockito-core -->
@@ -116,14 +116,14 @@
                 <groupId>org.mockito</groupId>
                 <artifactId>mockito-core</artifactId>
 			    <!-- Hold at version 4.x for Java 8 compatibility -->
-			    <version>5.17.0</version>
+			    <version>5.18.0</version>
                 <scope>test</scope>
             </dependency>
 			<dependency>
 			    <groupId>org.mockito</groupId>
 			    <artifactId>mockito-junit-jupiter</artifactId>
 			    <!-- Hold at version 4.x for Java 8 compatibility -->
-			    <version>5.17.0</version>
+			    <version>5.18.0</version>
 			    <scope>test</scope>
 			</dependency>
 			<!-- https://mvnrepository.com/artifact/org.hamcrest/hamcrest -->