diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index c0eb90c..3948594 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,5 +1,5 @@
 # Based on https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/gitlab/ci/templates/Gradle.gitlab-ci.yml
-image: gradle:jdk11
+image: gradle:jdk19
 
 variables:
   GRADLE_OPTS: "-Dorg.gradle.daemon=false"
diff --git a/gradle.properties b/gradle.properties
index c16f870..6ab1061 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,4 +1,4 @@
 kotlin.code.style=official
 
-coroutinesVersion=1.6.1
-kotlinVersion=1.6.20
+coroutinesVersion=1.6.4
+kotlinVersion=1.8.20