diff --git a/core/spring-boot/src/test/java/org/springframework/boot/logging/logback/SpringBootJoranConfiguratorTests.java b/core/spring-boot/src/test/java/org/springframework/boot/logging/logback/SpringBootJoranConfiguratorTests.java
index d3a2b4141df..0b08bbe8ac2 100644
--- a/core/spring-boot/src/test/java/org/springframework/boot/logging/logback/SpringBootJoranConfiguratorTests.java
+++ b/core/spring-boot/src/test/java/org/springframework/boot/logging/logback/SpringBootJoranConfiguratorTests.java
@@ -339,7 +339,8 @@ class SpringBootJoranConfiguratorTests {
 			<configuration>
 				<include resource="org/springframework/boot/logging/logback/base.xml"/>
 				<springProperty scope="context" name="MINE" source="my.example-property"/>
-				<if condition='property("MINE").contains("true")'>
+				<condition class="org.springframework.boot.logging.logback.TestPropertyCondition"/>
+				<if>
 					<then>
 						<variable scope="context" name="MYCHECK" value="i-was-included"/>
 					</then>
diff --git a/core/spring-boot/src/test/java/org/springframework/boot/logging/logback/TestPropertyCondition.java b/core/spring-boot/src/test/java/org/springframework/boot/logging/logback/TestPropertyCondition.java
new file mode 100644
index 00000000000..e9adc7bdc4c
--- /dev/null
+++ b/core/spring-boot/src/test/java/org/springframework/boot/logging/logback/TestPropertyCondition.java
@@ -0,0 +1,34 @@
+/*
+ * Copyright 2012-present 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.boot.logging.logback;
+
+import ch.qos.logback.core.boolex.PropertyConditionBase;
+
+/**
+ * Test condition used by {@link SpringBootJoranConfiguratorTests}.
+ *
+ * @author Stephane Nicoll
+ */
+@SuppressWarnings("unused")
+public class TestPropertyCondition extends PropertyConditionBase {
+
+	@Override
+	public boolean evaluate() {
+		return property("MINE").contains("true");
+	}
+
+}
diff --git a/platform/spring-boot-dependencies/build.gradle b/platform/spring-boot-dependencies/build.gradle
index b01d7270d1b..513f09e0005 100644
--- a/platform/spring-boot-dependencies/build.gradle
+++ b/platform/spring-boot-dependencies/build.gradle
@@ -1386,7 +1386,7 @@ bom {
 			releaseNotes("https://github.com/apache/logging-log4j2/releases/tag/rel%2F{version}")
 		}
 	}
-	library("Logback", "1.5.34") {
+	library("Logback", "1.5.38") {
 		group("ch.qos.logback") {
 			modules = [
 				"logback-classic",