diff --git a/.travis.yml b/.travis.yml
index c99aaf80c..8217793a7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,8 +6,8 @@ android:
   - tools
   - tools
   - platform-tools
-  - build-tools-26.0.2
-  - android-26
+  - build-tools-27.0.3
+  - android-27
   - extra-android-m2repository
   - extra-android-support
   - extra-google-m2repository
@@ -16,3 +16,4 @@ script:
 - "./gradlew build connectedCheck"
 before_install:
 - chmod +x gradlew
+- yes | sdkmanager "platforms;android-27"
diff --git a/SWADroid/build.gradle b/SWADroid/build.gradle
index e83821fe9..4e616a092 100644
--- a/SWADroid/build.gradle
+++ b/SWADroid/build.gradle
@@ -9,8 +9,8 @@ ext {
 }
 
 android {
-    compileSdkVersion 26
-    buildToolsVersion "26.0.2"
+    compileSdkVersion 27
+    buildToolsVersion "27.0.3"
 
     dexOptions {
         maxProcessCount=2
@@ -27,7 +27,7 @@ android {
         versionName gitVersionName
 
         minSdkVersion 14
-        targetSdkVersion 26
+        targetSdkVersion 27
 
         android.applicationVariants.all { variant ->
             def appName
@@ -38,10 +38,8 @@ android {
                 appName = parent.name
             }
 
-            variant.outputs.each { output ->
-                def newApkName
-                newApkName = "${appName}-${output.baseName}-${variant.versionName}.apk"
-                output.outputFile = new File(output.outputFile.parent, newApkName)
+            variant.outputs.all { output ->
+                outputFileName = "${appName}-${output.baseName}-${variant.versionName}.apk"
             }
         }
 
@@ -77,13 +75,13 @@ def getBuildConfigField(String property){
 }
 
 dependencies {
-    compile 'com.android.support:support-v4:26.0.0'
-    compile 'com.android.support:appcompat-v7:26.0.0'
-    compile 'com.google.android.gms:play-services-analytics:11.0.4'
+    compile 'com.android.support:support-v4:27.0.2'
+    compile 'com.android.support:appcompat-v7:27.0.2'
+    compile 'com.google.android.gms:play-services-analytics:11.8.0'
     compile 'com.google.code.ksoap2-android:ksoap2-android:3.6.2'
-    compile 'commons-io:commons-io:2.5'
+    compile 'commons-io:commons-io:2.6'
     compile 'com.nostra13.universalimageloader:universal-image-loader:1.9.5'
     compile 'com.journeyapps:zxing-android-embedded:3.5.0@aar'
-    compile 'com.google.zxing:core:3.3.0'
-    compile 'com.google.code.gson:gson:2.8.1'
+    compile 'com.google.zxing:core:3.3.1'
+    compile 'com.google.code.gson:gson:2.8.2'
 }
\ No newline at end of file
diff --git a/SWADroid/src/main/java/es/ugr/swad/swadroid/modules/groups/EnrollmentExpandableListAdapter.java b/SWADroid/src/main/java/es/ugr/swad/swadroid/modules/groups/EnrollmentExpandableListAdapter.java
index f628cd24e..51d476231 100644
--- a/SWADroid/src/main/java/es/ugr/swad/swadroid/modules/groups/EnrollmentExpandableListAdapter.java
+++ b/SWADroid/src/main/java/es/ugr/swad/swadroid/modules/groups/EnrollmentExpandableListAdapter.java
@@ -198,16 +198,16 @@ public View getChildView(int groupPosition, int childPosition,
         if (multiple == 0 && role != Constants.TEACHER_TYPE_CODE) { //single inscriptions:
             holder.checkBox.setVisibility(View.GONE);
             holder.radioButton.setVisibility(View.VISIBLE);
+            holder.radioButton.setText(groupName);
 
         } else { //multiple inscriptions :
 
             holder.checkBox.setVisibility(View.VISIBLE);
             holder.radioButton.setVisibility(View.GONE);
+            holder.checkBox.setText(groupName);
+            holder.checkBox.setChecked(member != 0);
         }
 
-        holder.checkBox.setText(groupName);
-        holder.checkBox.setChecked(member != 0);
-
         holder.nStudentText.setText(context.getString(R.string.numStudent) + ": " + String.valueOf(students));
 
         if (maxStudents != -1) {
diff --git a/SWADroid/src/main/res/raw-es/changes.html b/SWADroid/src/main/res/raw-es/changes.html
index a304c8f26..1b693af55 100644
--- a/SWADroid/src/main/res/raw-es/changes.html
+++ b/SWADroid/src/main/res/raw-es/changes.html
@@ -14,6 +14,13 @@
     </style>
 </head>
 
+<body bgcolor="white">
+<h4>1.5.4 (2018-02-25)</h4>
+<ul>
+    <lh class="fix">[CORRECCIONES]</lh>
+    <li type="disc"><strong>Grupos&#58;</strong> Corregida visualización del nombre de los grupos de selección única</li>
+</ul>
+
 <body bgcolor="white">
 <h4>1.5.3 (2017-10-25)</h4>
 <ul>
diff --git a/SWADroid/src/main/res/raw/changes.html b/SWADroid/src/main/res/raw/changes.html
index 2fba3186c..0b3b60c4d 100644
--- a/SWADroid/src/main/res/raw/changes.html
+++ b/SWADroid/src/main/res/raw/changes.html
@@ -14,6 +14,13 @@
     </style>
 </head>
 
+<body bgcolor="white">
+<h4>1.5.4 (2018-02-25)</h4>
+<ul>
+    <lh class="fix">[FIXES]</lh>
+    <li type="disc"><strong>Groups&#58;</strong> Fixed display of the name of single choice groups</li>
+</ul>
+
 <body bgcolor="white">
 <h4>1.5.3 (2017-10-25)</h4>
 <ul>
diff --git a/build.gradle b/build.gradle
index 9652155ad..c466735cd 100644
--- a/build.gradle
+++ b/build.gradle
@@ -2,9 +2,10 @@
 buildscript {
     repositories {
         jcenter()
+        google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.3.3'
+        classpath 'com.android.tools.build:gradle:3.0.1'
         classpath 'org.ajoberstar:grgit:1.8.0'
     }
 }
@@ -12,7 +13,7 @@ buildscript {
 allprojects {
     repositories {
         jcenter()
+        google()
         maven { url 'https://oss.sonatype.org/content/repositories/ksoap2-android-releases' }
-        maven { url 'https://maven.google.com' }
     }
 }
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index d50e32c7e..33dd2e14a 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Fri Mar 03 17:05:52 CET 2017
+#Wed Oct 25 20:37:21 CEST 2017
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-3.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.1-all.zip