diff --git a/anko-asynchronous-tasks/build.gradle b/anko-asynchronous-tasks/build.gradle
index 211a5e8..df817f6 100644
--- a/anko-asynchronous-tasks/build.gradle
+++ b/anko-asynchronous-tasks/build.gradle
@@ -2,7 +2,7 @@
 
 buildscript {
 
-    ext.kotlin_version = '1.2.31'
+    ext.kotlin_version = '1.2.61'
     ext.anko_version = '0.10.4'
 
     repositories {
@@ -11,7 +11,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.1.1'
+        classpath 'com.android.tools.build:gradle:3.1.4'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
diff --git a/anko-simple-ui/build.gradle b/anko-simple-ui/build.gradle
index b6bf0da..f076dea 100644
--- a/anko-simple-ui/build.gradle
+++ b/anko-simple-ui/build.gradle
@@ -2,7 +2,7 @@
 
 buildscript {
 
-    ext.kotlin_version = '1.2.31'
+    ext.kotlin_version = '1.2.61'
     ext.anko_version = '0.10.4'
 
     repositories {
@@ -10,7 +10,7 @@ buildscript {
         google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.1.1'
+        classpath 'com.android.tools.build:gradle:3.1.4'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
 
         // NOTE: Do not place your application dependencies here; they belong
diff --git a/gson-deserializers-okhttp-asynctask/build.gradle b/gson-deserializers-okhttp-asynctask/build.gradle
index c38c228..4d5c3d8 100644
--- a/gson-deserializers-okhttp-asynctask/build.gradle
+++ b/gson-deserializers-okhttp-asynctask/build.gradle
@@ -2,7 +2,7 @@
 
 buildscript {
 
-    ext.kotlin_version = '1.2.31'
+    ext.kotlin_version = '1.2.61'
 
     repositories {
         jcenter()
@@ -10,7 +10,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.1.1'
+        classpath 'com.android.tools.build:gradle:3.1.4'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
diff --git a/httpurlconnection-asynctask/build.gradle b/httpurlconnection-asynctask/build.gradle
index c38c228..4d5c3d8 100644
--- a/httpurlconnection-asynctask/build.gradle
+++ b/httpurlconnection-asynctask/build.gradle
@@ -2,7 +2,7 @@
 
 buildscript {
 
-    ext.kotlin_version = '1.2.31'
+    ext.kotlin_version = '1.2.61'
 
     repositories {
         jcenter()
@@ -10,7 +10,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.1.1'
+        classpath 'com.android.tools.build:gradle:3.1.4'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
diff --git a/listview-baseadapter-data-object/build.gradle b/listview-baseadapter-data-object/build.gradle
index c38c228..4d5c3d8 100644
--- a/listview-baseadapter-data-object/build.gradle
+++ b/listview-baseadapter-data-object/build.gradle
@@ -2,7 +2,7 @@
 
 buildscript {
 
-    ext.kotlin_version = '1.2.31'
+    ext.kotlin_version = '1.2.61'
 
     repositories {
         jcenter()
@@ -10,7 +10,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.1.1'
+        classpath 'com.android.tools.build:gradle:3.1.4'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
diff --git a/okhttp-asynctask/app/build.gradle b/okhttp-asynctask/app/build.gradle
index 852fb90..66a92aa 100644
--- a/okhttp-asynctask/app/build.gradle
+++ b/okhttp-asynctask/app/build.gradle
@@ -27,7 +27,7 @@ android {
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
     implementation 'com.android.support:appcompat-v7:27.1.1'
-    implementation 'com.squareup.okhttp3:okhttp:3.9.1'
+    implementation 'com.squareup.okhttp3:okhttp:3.10.0'
     implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
 }
 
diff --git a/okhttp-asynctask/build.gradle b/okhttp-asynctask/build.gradle
index c38c228..4d5c3d8 100644
--- a/okhttp-asynctask/build.gradle
+++ b/okhttp-asynctask/build.gradle
@@ -2,7 +2,7 @@
 
 buildscript {
 
-    ext.kotlin_version = '1.2.31'
+    ext.kotlin_version = '1.2.61'
 
     repositories {
         jcenter()
@@ -10,7 +10,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.1.1'
+        classpath 'com.android.tools.build:gradle:3.1.4'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files