diff --git a/course-info.yaml b/course-info.yaml
index 9347e79..ff8591f 100644
--- a/course-info.yaml
+++ b/course-info.yaml
@@ -7,4 +7,4 @@ content:
   - introductionSection
   - psiSection
 environment_settings:
-  jvm_language_level: JDK_20
+  jvm_language_level: JDK_17