diff --git a/app/build.gradle b/app/build.gradle
index b25b73d..b44ac70 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -6,8 +6,8 @@ android {
     defaultConfig {
         minSdkVersion 15
         targetSdkVersion 27
-        versionCode 5
-        versionName "1.4"
+        versionCode 6
+        versionName "1.5"
         applicationId "org.schabi.nxbookmarks"
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
     }
@@ -32,14 +32,14 @@ android {
 }
 
 dependencies {
-    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
+    androidTestImplementation('com.android.support.test.espresso:espresso-core:2.2.2', {
         exclude group: 'com.android.support', module: 'support-annotations'
     })
-    compile 'com.android.support:appcompat-v7:27.1.1'
-    compile 'com.android.support:design:27.1.1'
-    compile 'com.android.support:cardview-v7:27.1.1'
-    testCompile 'junit:junit:4.12'
-    compile 'org.eclipse.birt.runtime.3_7_1:org.apache.commons.codec:1.3.0'
-    compile 'org.jsoup:jsoup:1.11.2'
-    compile 'com.android.support.constraint:constraint-layout:1.0.2'
+    implementation 'com.android.support:appcompat-v7:27.1.1'
+    implementation 'com.android.support:design:27.1.1'
+    implementation 'com.android.support:cardview-v7:27.1.1'
+    testImplementation 'junit:junit:4.12'
+    implementation 'org.eclipse.birt.runtime.3_7_1:org.apache.commons.codec:1.3.0'
+    implementation 'org.jsoup:jsoup:1.11.2'
+    implementation 'com.android.support.constraint:constraint-layout:1.1.0'
 }
diff --git a/app/src/main/java/org/schabi/ocbookmarks/AddBookmarkActivity.java b/app/src/main/java/org/schabi/ocbookmarks/AddBookmarkActivity.java
index abd7058..2b89695 100644
--- a/app/src/main/java/org/schabi/ocbookmarks/AddBookmarkActivity.java
+++ b/app/src/main/java/org/schabi/ocbookmarks/AddBookmarkActivity.java
@@ -54,7 +54,7 @@ protected String doInBackground(Void... params) {
                         try {
                             connector.addBookmark(bookmark);
                         } catch (Exception e) {
-                            //e.printStackTrace();
+                            if(BuildConfig.DEBUG) e.printStackTrace();
                             return getString(R.string.could_not_add_bookmark);
                         }
                         return null;
diff --git a/app/src/main/java/org/schabi/ocbookmarks/IconHandler.java b/app/src/main/java/org/schabi/ocbookmarks/IconHandler.java
index e5d580d..dae0f5d 100644
--- a/app/src/main/java/org/schabi/ocbookmarks/IconHandler.java
+++ b/app/src/main/java/org/schabi/ocbookmarks/IconHandler.java
@@ -94,7 +94,7 @@ protected Bitmap doInBackground(Void... params) {
 
                     return null;
                 } catch (Exception e) {
-                    //e.printStackTrace();
+                    if(BuildConfig.DEBUG) e.printStackTrace();
                     return null;
                 } finally {
                     try {
@@ -102,7 +102,7 @@ protected Bitmap doInBackground(Void... params) {
                             in.close();
                         }
                     } catch (Exception e) {
-                        //e.printStackTrace();
+                        if(BuildConfig.DEBUG) e.printStackTrace();
                     }
                 }
             }
@@ -145,7 +145,7 @@ private void setSiteHasNoIcon(Bookmark bookmark) {
         try {
             iconFile.createNewFile();
         } catch (Exception e) {
-            //e.printStackTrace();
+            if(BuildConfig.DEBUG) e.printStackTrace();
         }
     }
 
@@ -158,7 +158,7 @@ private void storeIcon(Bookmark bookmark, Bitmap icon) {
             out = new FileOutputStream(iconFile.toString());
             icon.compress(Bitmap.CompressFormat.PNG, 100, out);
         } catch (Exception e) {
-            //e.printStackTrace();
+            if(BuildConfig.DEBUG) e.printStackTrace();
         }
     }
 
diff --git a/app/src/main/java/org/schabi/ocbookmarks/MainActivity.java b/app/src/main/java/org/schabi/ocbookmarks/MainActivity.java
index 00b0951..117cb2a 100644
--- a/app/src/main/java/org/schabi/ocbookmarks/MainActivity.java
+++ b/app/src/main/java/org/schabi/ocbookmarks/MainActivity.java
@@ -207,14 +207,14 @@ protected String doInBackground(Void... params) {
                     try {
                         connector.addBookmark(bookmark);
                     } catch (Exception e) {
-                        //e.printStackTrace();
+                        if(BuildConfig.DEBUG) e.printStackTrace();
                         return getString(R.string.could_not_add_bookmark);
                     }
                 } else {
                     try {
                         connector.editBookmark(bookmark);
                     } catch (Exception e) {
-                        //e.printStackTrace();
+                        if(BuildConfig.DEBUG) e.printStackTrace();
                         return getString(R.string.could_not_change_bookmark);
                     }
                 }
@@ -430,7 +430,7 @@ protected Bookmark[] doInBackground(Void... bla) {
                 storeToFile(data);
                 return connector.getFromRawJson(data);
             } catch (Exception e) {
-                //e.printStackTrace();
+                if(BuildConfig.DEBUG) e.printStackTrace();
                 return null;
             }
         }
@@ -469,9 +469,9 @@ private void loadFromFile() {
                 mTagsFragment.updateData(Bookmark.getTagsFromBookmarks(bookmarks));
                 mBookmarkFragment.updateData(bookmarks);
             } catch (JSONException je) {
-                //e.printStackTrace();
+                if(BuildConfig.DEBUG) je.printStackTrace();
             } catch (Exception e) {
-                //e.printStackTrace();
+                if(BuildConfig.DEBUG) e.printStackTrace();
             }
         }
     }
@@ -483,7 +483,7 @@ private void storeToFile(JSONArray data) {
             jsonFile.flush();
             jsonFile.close();
         } catch (Exception e) {
-            //e.printStackTrace();
+            if(BuildConfig.DEBUG) e.printStackTrace();
         }
     }
 }
diff --git a/app/src/main/java/org/schabi/ocbookmarks/REST/OCBookmarksRestConnector.java b/app/src/main/java/org/schabi/ocbookmarks/REST/OCBookmarksRestConnector.java
index 6cb1b00..5236dea 100644
--- a/app/src/main/java/org/schabi/ocbookmarks/REST/OCBookmarksRestConnector.java
+++ b/app/src/main/java/org/schabi/ocbookmarks/REST/OCBookmarksRestConnector.java
@@ -77,7 +77,7 @@ public JSONObject send(String methode, String relativeUrl) throws RequestExcepti
     private JSONObject parseJson(String methode, String url, String response) throws RequestException {
 
         JSONObject data = null;
-        if(methode == "GET" && url.endsWith("/tag")) {
+        if(methode.equals("GET") && url.endsWith("/tag")) {
             // we have to handle GET /tag different:
             // https://github.com/nextcloud/bookmarks#list-all-tags
             JSONArray array = null;
diff --git a/build.gradle b/build.gradle
index f93d608..44bac8f 100644
--- a/build.gradle
+++ b/build.gradle
@@ -6,7 +6,7 @@ buildscript {
         google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.0.0'
+        classpath 'com.android.tools.build:gradle:3.1.2'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index a654982..aeadd84 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Tue Nov 14 11:46:45 CET 2017
+#Mon May 07 21:07:40 CEST 2018
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.4-all.zip