diff --git a/app/build.gradle b/app/build.gradle
index 286bfb2..243c110 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -24,16 +24,12 @@ android {
         }
     }
     compileOptions {
-        sourceCompatibility = JavaVersion.VERSION_11
-        targetCompatibility = JavaVersion.VERSION_11
-    }
-    java {
-        toolchain {
-            languageVersion = JavaLanguageVersion.of(11)
-        }
+        sourceCompatibility = JavaVersion.VERSION_1_8
+        targetCompatibility = JavaVersion.VERSION_1_8
     }
+
     kotlinOptions {
-        jvmTarget = '11'
+        jvmTarget = '1.8'
         useIR = true
     }
     buildFeatures {
diff --git a/banner/build.gradle b/banner/build.gradle
index 7fa3783..c5ed4d3 100644
--- a/banner/build.gradle
+++ b/banner/build.gradle
@@ -24,16 +24,11 @@ android {
         }
     }
     compileOptions {
-        sourceCompatibility = JavaVersion.VERSION_11
-        targetCompatibility = JavaVersion.VERSION_11
-    }
-    java {
-        toolchain {
-            languageVersion = JavaLanguageVersion.of(11)
-        }
+        sourceCompatibility = JavaVersion.VERSION_1_8
+        targetCompatibility = JavaVersion.VERSION_1_8
     }
     kotlinOptions {
-        jvmTarget = '11'
+        jvmTarget = '1.8'
         useIR = true
     }
     buildFeatures {
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 892a8bd..65e67b7 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Mon Mar 29 15:50:30 CST 2021
+#Mon Mar 29 15:54:41 CST 2021
 distributionBase=GRADLE_USER_HOME
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.8.3-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.0-rc-1-bin.zip
 distributionPath=wrapper/dists
 zipStorePath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME