diff --git a/app/build.gradle b/app/build.gradle
index 2bd242a9..f0d0f2a1 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -50,8 +50,8 @@ dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
 
     // https://developer.android.com/topic/libraries/support-library/revisions.html
-    implementation 'com.android.support:appcompat-v7:27.+'
-    implementation 'com.android.support:recyclerview-v7:27.+'
+    implementation 'com.android.support:appcompat-v7:27.1.1'
+    implementation 'com.android.support:recyclerview-v7:27.1.1'
 
     // https://developers.google.com/android/guides/setup
     implementation 'com.google.android.gms:play-services-base:12.0.1'
diff --git a/build.gradle b/build.gradle
index 50f7527e..26fcf4ea 100644
--- a/build.gradle
+++ b/build.gradle
@@ -19,6 +19,7 @@ buildscript {
 
 allprojects {
     repositories {
+        jcenter()
         mavenCentral()
         maven {
             url 'https://maven.google.com'
@@ -31,7 +32,7 @@ subprojects {
         resolutionStrategy.eachDependency { details ->
             if (details.requested.group == 'com.android.support'
                     && !details.requested.name.contains('multidex')) {
-                details.useVersion "27.1.0"
+                details.useVersion "27.1.1"
             }
         }
     }