diff --git a/build.gradle b/build.gradle
index 8e79b39..77147a5 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,7 +1,7 @@
 plugins {
     id 'org.jetbrains.kotlin.jvm' version '1.3.72'
     id 'org.jetbrains.kotlin.plugin.spring' version '1.3.72'
-    id 'org.springframework.boot' version '2.2.7.RELEASE'
+    id 'org.springframework.boot' version '2.3.0.RELEASE'
     id 'io.spring.dependency-management' version '1.0.9.RELEASE'
 }
 
diff --git a/src/main/kotlin/org/mosad/thecitadelofricks/hsoparser/CourseListParser.kt b/src/main/kotlin/org/mosad/thecitadelofricks/hsoparser/CourseListParser.kt
index 6aacf33..fb940f0 100644
--- a/src/main/kotlin/org/mosad/thecitadelofricks/hsoparser/CourseListParser.kt
+++ b/src/main/kotlin/org/mosad/thecitadelofricks/hsoparser/CourseListParser.kt
@@ -29,7 +29,7 @@ import java.net.SocketTimeoutException
 
 class CourseListParser {
 
-    var logger: org.slf4j.Logger = LoggerFactory.getLogger(MensaParser::class.java)
+    private var logger: org.slf4j.Logger = LoggerFactory.getLogger(MensaParser::class.java)
 
     /**
      * return a list of all courses at courseListURL