diff --git a/instrumentation/internal/internal-application-logger/javaagent/build.gradle.kts b/instrumentation/internal/internal-application-logger/javaagent/build.gradle.kts
index 2bc0de0be5..59a30e0c07 100644
--- a/instrumentation/internal/internal-application-logger/javaagent/build.gradle.kts
+++ b/instrumentation/internal/internal-application-logger/javaagent/build.gradle.kts
@@ -31,7 +31,8 @@ dependencies {
   }
 
   if (findProperty("testLatestDeps") as Boolean) {
-    testImplementation("ch.qos.logback:logback-classic:+")
+    // 1.4.9 breaks the Configurer interface, and Spring Boot hasn't caught up with that yet
+    testImplementation("ch.qos.logback:logback-classic:1.4.8")
   } else {
     testImplementation("ch.qos.logback:logback-classic") {
       version {