diff --git a/app/build.gradle b/app/build.gradle
index 1bf48c9..d455068 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,13 +1,13 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 29
+    compileSdkVersion 30
     useLibrary 'org.apache.http.legacy'
 
     defaultConfig {
         applicationId "uk.org.openseizuredetector"
         minSdkVersion 24
-        targetSdkVersion 29
+        targetSdkVersion 30
         multiDexEnabled true
     }
 
@@ -28,7 +28,6 @@ android {
         sourceCompatibility JavaVersion.VERSION_1_8
         targetCompatibility JavaVersion.VERSION_1_8
     }
-    buildToolsVersion '29.0.2'
 }
 
 dependencies {
diff --git a/app/release/app-release-3.2.1.apk b/app/release/app-release-3.2.1.apk
deleted file mode 100644
index 2e19485..0000000
Binary files a/app/release/app-release-3.2.1.apk and /dev/null differ
diff --git a/app/release/app-release-3.6.0.apk b/app/release/app-release-3.6.0.apk
deleted file mode 100644
index 7a5f8d8..0000000
Binary files a/app/release/app-release-3.6.0.apk and /dev/null differ
diff --git a/app/release/app-release-3.6.1.apk b/app/release/app-release-3.6.1.apk
deleted file mode 100644
index 0004c6e..0000000
Binary files a/app/release/app-release-3.6.1.apk and /dev/null differ
diff --git a/app/release/app-release-3.6.3a.apk b/app/release/app-release-3.6.3a.apk
deleted file mode 100644
index ccb8645..0000000
Binary files a/app/release/app-release-3.6.3a.apk and /dev/null differ
diff --git a/app/release/app-release-3.7.0a.apk b/app/release/app-release-3.7.0a.apk
deleted file mode 100644
index e133013..0000000
Binary files a/app/release/app-release-3.7.0a.apk and /dev/null differ
diff --git a/app/release/app-release-4.0.0.apk b/app/release/app-release-4.0.0.apk
index 7ea8f4b..6132e23 100644
Binary files a/app/release/app-release-4.0.0.apk and b/app/release/app-release-4.0.0.apk differ
diff --git a/app/release/output.json b/app/release/output.json
deleted file mode 100644
index 6468f2d..0000000
--- a/app/release/output.json
+++ /dev/null
@@ -1 +0,0 @@
-[{"outputType":{"type":"APK"},"apkData":{"type":"MAIN","splits":[],"versionCode":72,"versionName":"3.5.0","enabled":true,"outputFile":"app-release.apk","fullName":"release","baseName":"release","dirName":""},"path":"app-release.apk","properties":{}}]
\ No newline at end of file
diff --git a/build.gradle b/build.gradle
index f3ef4da..e2f009c 100644
--- a/build.gradle
+++ b/build.gradle
@@ -9,7 +9,7 @@ buildscript {
         google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.1.3'
+        classpath 'com.android.tools.build:gradle:7.1.0'
     }
 }
 allprojects {
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index c1a9123..2ce1c44 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.2-all.zip