diff --git a/core/src/main/java/org/springframework/security/core/SpringSecurityCoreVersion.java b/core/src/main/java/org/springframework/security/core/SpringSecurityCoreVersion.java
index 06fc114050..2521326368 100644
--- a/core/src/main/java/org/springframework/security/core/SpringSecurityCoreVersion.java
+++ b/core/src/main/java/org/springframework/security/core/SpringSecurityCoreVersion.java
@@ -38,7 +38,7 @@ public class SpringSecurityCoreVersion {
 	 * N.B. Classes are not intended to be serializable between different versions. See
 	 * SEC-1709 for why we still need a serial version.
 	 */
-	public static final long SERIAL_VERSION_UID = 500L;
+	public static final long SERIAL_VERSION_UID = 510L;
 
 	static final String MIN_SPRING_VERSION = "5.0.4.RELEASE";
 
diff --git a/taglibs/src/main/resources/META-INF/security.tld b/taglibs/src/main/resources/META-INF/security.tld
index 82dc2ba0ce..1a4cf3450f 100644
--- a/taglibs/src/main/resources/META-INF/security.tld
+++ b/taglibs/src/main/resources/META-INF/security.tld
@@ -20,7 +20,7 @@
         version="2.0">
     <description>Spring Security Authorization Tag Library</description>
 
-    <tlib-version>5.0</tlib-version>
+    <tlib-version>5.1</tlib-version>
     <short-name>security</short-name>
     <uri>http://www.springframework.org/security/tags</uri>