diff --git a/build.gradle b/build.gradle
index aae056fc8..d31fa4246 100644
--- a/build.gradle
+++ b/build.gradle
@@ -24,7 +24,7 @@ allprojects {
     plugins.withType(JavaBasePlugin) {
         java {
             toolchain {
-                languageVersion = JavaLanguageVersion.of(11)
+                languageVersion = JavaLanguageVersion.of(8)
             }
         }
     }
diff --git a/gradle.properties b/gradle.properties
index 234abd190..5b0a5a9f5 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -8,7 +8,7 @@ version=$quartzVersion
 slf4jVersion = 1.7.36
 log4jVersion = 2.19.0
 c3p0Version = 0.9.5.5
-hikaricpVersion = 5.0.1
+hikaricpVersion = 4.0.3
 
 jbossVersion = 4.0.2
 commonjVersion = 1.0