diff --git a/build.gradle b/build.gradle
index 63a5f5eaaa..9c83e045db 100644
--- a/build.gradle
+++ b/build.gradle
@@ -37,10 +37,14 @@ allprojects {
         // components provided by the library may be of use on older devices.
         // However, please note that the core media playback functionality
         // provided by the library requires API level 16 or greater.
-        minSdkVersion=9
-        compileSdkVersion=25
-        targetSdkVersion=25
-        buildToolsVersion='25'
+        minSdkVersion = 9
+        compileSdkVersion = 25
+        targetSdkVersion = 25
+        buildToolsVersion = '25'
+        testSupportLibraryVersion = '0.5'
+        supportLibraryVersion = '25.3.1'
+        dexmakerVersion = '1.2'
+        mockitoVersion = '1.9.5'
         releaseRepoName = getBintrayRepo()
         releaseUserOrg = 'google'
         releaseGroupId = 'com.google.android.exoplayer'
diff --git a/extensions/cronet/build.gradle b/extensions/cronet/build.gradle
index 5e3c2ab482..5611817b2e 100644
--- a/extensions/cronet/build.gradle
+++ b/extensions/cronet/build.gradle
@@ -33,11 +33,11 @@ dependencies {
     compile files('libs/cronet_api.jar')
     compile files('libs/cronet_impl_common_java.jar')
     compile files('libs/cronet_impl_native_java.jar')
-    androidTestCompile 'com.google.dexmaker:dexmaker:1.2'
-    androidTestCompile 'com.google.dexmaker:dexmaker-mockito:1.2'
-    androidTestCompile 'org.mockito:mockito-core:1.9.5'
     androidTestCompile project(':library')
-    androidTestCompile 'com.android.support.test:runner:0.5'
+    androidTestCompile 'com.google.dexmaker:dexmaker:' + dexmakerVersion
+    androidTestCompile 'com.google.dexmaker:dexmaker-mockito:' + dexmakerVersion
+    androidTestCompile 'org.mockito:mockito-core:' + mockitoVersion
+    androidTestCompile 'com.android.support.test:runner:' + testSupportLibraryVersion
 }
 
 ext {
diff --git a/library/all/build.gradle b/library/all/build.gradle
index e88ee2721d..63943ada77 100644
--- a/library/all/build.gradle
+++ b/library/all/build.gradle
@@ -11,8 +11,6 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
-import com.android.builder.core.BuilderConstants
-
 apply plugin: 'com.android.library'
 
 android {
diff --git a/library/core/build.gradle b/library/core/build.gradle
index 8ab63af26f..bb0adaa4c7 100644
--- a/library/core/build.gradle
+++ b/library/core/build.gradle
@@ -36,10 +36,10 @@ android {
 }
 
 dependencies {
-    compile 'com.android.support:support-annotations:25.2.0'
-    androidTestCompile 'com.google.dexmaker:dexmaker:1.2'
-    androidTestCompile 'com.google.dexmaker:dexmaker-mockito:1.2'
-    androidTestCompile 'org.mockito:mockito-core:1.9.5'
+    compile 'com.android.support:support-annotations:' + supportLibraryVersion
+    androidTestCompile 'com.google.dexmaker:dexmaker:' + dexmakerVersion
+    androidTestCompile 'com.google.dexmaker:dexmaker-mockito:' + dexmakerVersion
+    androidTestCompile 'org.mockito:mockito-core:' + mockitoVersion
 }
 
 ext {
diff --git a/library/dash/build.gradle b/library/dash/build.gradle
index e608181fab..ebad5a8603 100644
--- a/library/dash/build.gradle
+++ b/library/dash/build.gradle
@@ -37,11 +37,11 @@ android {
 
 dependencies {
     compile project(':library-core')
-    compile 'com.android.support:support-annotations:25.2.0'
-    compile 'com.android.support:support-core-utils:25.2.0'
-    androidTestCompile 'com.google.dexmaker:dexmaker:1.2'
-    androidTestCompile 'com.google.dexmaker:dexmaker-mockito:1.2'
-    androidTestCompile 'org.mockito:mockito-core:1.9.5'
+    compile 'com.android.support:support-annotations:' + supportLibraryVersion
+    compile 'com.android.support:support-core-utils:' + supportLibraryVersion
+    androidTestCompile 'com.google.dexmaker:dexmaker:' + dexmakerVersion
+    androidTestCompile 'com.google.dexmaker:dexmaker-mockito:' + dexmakerVersion
+    androidTestCompile 'org.mockito:mockito-core:' + mockitoVersion
 }
 
 ext {
diff --git a/library/hls/build.gradle b/library/hls/build.gradle
index e7375fbc8e..47b5758b1d 100644
--- a/library/hls/build.gradle
+++ b/library/hls/build.gradle
@@ -31,10 +31,10 @@ android {
 
 dependencies {
     compile project(':library-core')
-    compile 'com.android.support:support-annotations:25.2.0'
-    androidTestCompile 'com.google.dexmaker:dexmaker:1.2'
-    androidTestCompile 'com.google.dexmaker:dexmaker-mockito:1.2'
-    androidTestCompile 'org.mockito:mockito-core:1.9.5'
+    compile 'com.android.support:support-annotations:' + supportLibraryVersion
+    androidTestCompile 'com.google.dexmaker:dexmaker:' + dexmakerVersion
+    androidTestCompile 'com.google.dexmaker:dexmaker-mockito:' + dexmakerVersion
+    androidTestCompile 'org.mockito:mockito-core:' + mockitoVersion
 }
 
 ext {
diff --git a/library/smoothstreaming/build.gradle b/library/smoothstreaming/build.gradle
index 1f76f1043d..81f8234672 100644
--- a/library/smoothstreaming/build.gradle
+++ b/library/smoothstreaming/build.gradle
@@ -37,10 +37,10 @@ android {
 
 dependencies {
     compile project(':library-core')
-    compile 'com.android.support:support-annotations:25.2.0'
-    androidTestCompile 'com.google.dexmaker:dexmaker:1.2'
-    androidTestCompile 'com.google.dexmaker:dexmaker-mockito:1.2'
-    androidTestCompile 'org.mockito:mockito-core:1.9.5'
+    compile 'com.android.support:support-annotations:' + supportLibraryVersion
+    androidTestCompile 'com.google.dexmaker:dexmaker:' + dexmakerVersion
+    androidTestCompile 'com.google.dexmaker:dexmaker-mockito:' + dexmakerVersion
+    androidTestCompile 'org.mockito:mockito-core:' + mockitoVersion
 }
 
 ext {
diff --git a/library/ui/build.gradle b/library/ui/build.gradle
index 9e1e0ba85a..96dcd52655 100644
--- a/library/ui/build.gradle
+++ b/library/ui/build.gradle
@@ -31,7 +31,7 @@ android {
 
 dependencies {
     compile project(':library-core')
-    compile 'com.android.support:support-annotations:25.2.0'
+    compile 'com.android.support:support-annotations:' + supportLibraryVersion
 }
 
 ext {
diff --git a/testutils/build.gradle b/testutils/build.gradle
index a97c743384..f1d557bbf5 100644
--- a/testutils/build.gradle
+++ b/testutils/build.gradle
@@ -25,5 +25,5 @@ android {
 
 dependencies {
     compile project(':library')
-    compile 'org.mockito:mockito-core:1.9.5'
+    compile 'org.mockito:mockito-core:' + mockitoVersion
 }