diff --git a/config/src/test/java/org/springframework/security/config/SecurityNamespaceHandlerTests.java b/config/src/test/java/org/springframework/security/config/SecurityNamespaceHandlerTests.java
index 2f5079640e..31d31c7a93 100644
--- a/config/src/test/java/org/springframework/security/config/SecurityNamespaceHandlerTests.java
+++ b/config/src/test/java/org/springframework/security/config/SecurityNamespaceHandlerTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2021 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -26,6 +26,7 @@ import org.mockito.junit.jupiter.MockitoExtension;
 
 import org.springframework.beans.factory.parsing.BeanDefinitionParsingException;
 import org.springframework.security.config.util.InMemoryXmlApplicationContext;
+import org.springframework.security.config.util.SpringSecurityVersions;
 import org.springframework.test.util.ReflectionTestUtils;
 import org.springframework.util.ClassUtils;
 
@@ -133,6 +134,13 @@ public class SecurityNamespaceHandlerTests {
 		// should load just fine since no websocket block
 	}
 
+	@Test
+	public void configureWhenOldVersionThenErrorMessageContainsCorrectVersion() {
+		assertThatExceptionOfType(BeanDefinitionParsingException.class)
+				.isThrownBy(() -> new InMemoryXmlApplicationContext(XML_AUTHENTICATION_MANAGER, "3.0", null))
+				.withMessageContaining(SpringSecurityVersions.getCurrentXsdVersionFromSpringSchemas());
+	}
+
 	private void expectClassUtilsForNameThrowsNoClassDefFoundError(String className) {
 		this.classUtils.when(() -> ClassUtils.forName(eq(FILTER_CHAIN_PROXY_CLASSNAME), any()))
 				.thenThrow(new NoClassDefFoundError(className));
diff --git a/config/src/test/java/org/springframework/security/config/util/InMemoryXmlApplicationContext.java b/config/src/test/java/org/springframework/security/config/util/InMemoryXmlApplicationContext.java
index 306ae257be..f9660de009 100644
--- a/config/src/test/java/org/springframework/security/config/util/InMemoryXmlApplicationContext.java
+++ b/config/src/test/java/org/springframework/security/config/util/InMemoryXmlApplicationContext.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2009-2020 the original author or authors.
+ * Copyright 2009-2021 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,15 +16,10 @@
 
 package org.springframework.security.config.util;
 
-import java.io.IOException;
-import java.io.InputStream;
-import java.util.Properties;
-
 import org.springframework.beans.factory.support.DefaultListableBeanFactory;
 import org.springframework.context.ApplicationContext;
 import org.springframework.context.support.AbstractXmlApplicationContext;
 import org.springframework.core.io.Resource;
-import org.springframework.security.core.SpringSecurityCoreVersion;
 import org.springframework.security.util.InMemoryResource;
 
 /**
@@ -34,24 +29,6 @@ import org.springframework.security.util.InMemoryResource;
  */
 public class InMemoryXmlApplicationContext extends AbstractXmlApplicationContext {
 
-	private static String getCurrentXSDVersionFromSpringSchemas() {
-		Properties properties = new Properties();
-		try (InputStream is = SpringSecurityCoreVersion.class.getClassLoader()
-				.getResourceAsStream("META-INF/spring.schemas")) {
-			properties.load(is);
-		}
-		catch (IOException ex) {
-			throw new RuntimeException("Could not read 'META-INF/spring.schemas'", ex);
-		}
-
-		String inPackageLocation = properties
-				.getProperty("https://www.springframework.org/schema/security/spring-security.xsd");
-		String[] parts = inPackageLocation.split("-");
-		String currentXSD = parts[parts.length - 1];
-		String currentVersion = currentXSD.replace(".xsd", "");
-		return currentVersion;
-	}
-
 	static final String BEANS_OPENING = "<b:beans xmlns='http://www.springframework.org/schema/security'\n"
 			+ "    xmlns:context='http://www.springframework.org/schema/context'\n"
 			+ "    xmlns:b='http://www.springframework.org/schema/beans'\n"
@@ -66,7 +43,7 @@ public class InMemoryXmlApplicationContext extends AbstractXmlApplicationContext
 			+ "http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context-2.5.xsd\n"
 			+ "http://www.springframework.org/schema/security https://www.springframework.org/schema/security/spring-security-";
 	static final String BEANS_CLOSE = "</b:beans>\n";
-	static final String SPRING_SECURITY_VERSION = getCurrentXSDVersionFromSpringSchemas();
+	static final String SPRING_SECURITY_VERSION = SpringSecurityVersions.getCurrentXsdVersionFromSpringSchemas();
 
 	Resource inMemoryXml;
 
diff --git a/config/src/test/java/org/springframework/security/config/util/SpringSecurityVersions.java b/config/src/test/java/org/springframework/security/config/util/SpringSecurityVersions.java
new file mode 100644
index 0000000000..672f7de4aa
--- /dev/null
+++ b/config/src/test/java/org/springframework/security/config/util/SpringSecurityVersions.java
@@ -0,0 +1,57 @@
+/*
+ * Copyright 2002-2021 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.security.config.util;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Properties;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import org.springframework.security.core.SpringSecurityCoreVersion;
+
+/**
+ * For computing different Spring Security versions
+ */
+public final class SpringSecurityVersions {
+
+	static final Pattern SCHEMA_VERSION_PATTERN = Pattern.compile("\\d+\\.\\d+(\\.\\d+)?");
+
+	public static String getCurrentXsdVersionFromSpringSchemas() {
+		Properties properties = new Properties();
+		try (InputStream is = SpringSecurityCoreVersion.class.getClassLoader()
+				.getResourceAsStream("META-INF/spring.schemas")) {
+			properties.load(is);
+		}
+		catch (IOException ex) {
+			throw new RuntimeException("Could not read 'META-INF/spring.schemas'", ex);
+		}
+
+		String inPackageLocation = properties
+				.getProperty("https://www.springframework.org/schema/security/spring-security.xsd");
+		Matcher matcher = SCHEMA_VERSION_PATTERN.matcher(inPackageLocation);
+		if (matcher.find()) {
+			return matcher.group(0);
+		}
+		throw new IllegalStateException("Failed to find version");
+	}
+
+	private SpringSecurityVersions() {
+
+	}
+
+}