diff --git a/build.gradle b/build.gradle
index 9f289bb151..d7b42257bd 100644
--- a/build.gradle
+++ b/build.gradle
@@ -62,8 +62,6 @@ subprojects { project ->
                 lintOptions {
                     warningsAsErrors true
                     quiet true
-                    // TODO(#2730): Remove this after updating to the latest support library.
-                    disable "GradleDependency"
                 }
             }
         }
diff --git a/gradle.properties b/gradle.properties
index f85a3f09f7..1545f61aa5 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -15,7 +15,7 @@ POM_SCM_DEV_CONNECTION=scm:git@github.com:bumptech/glide.git
 POM_DEVELOPER_ID=sjudd
 POM_DEVELOPER_NAME=Sam Judd
 POM_DEVELOPER_EMAIL=judds@google.com
-ANDROID_SUPPORT_VERSION=26.1.0
+ANDROID_SUPPORT_VERSION=27.0.2
 VOLLEY_VERSION=1.0.0
 OK_HTTP_VERSION=3.9.0
 ANDROID_GRADLE_VERSION=3.0.1
@@ -36,8 +36,8 @@ PMD_VERSION=5.4.0
 FINDBUGS_VERSION=3.0.0
 ERROR_PRONE_VERSION=0.0.13
 
-COMPILE_SDK_VERSION=26
-TARGET_SDK_VERSION=26
+COMPILE_SDK_VERSION=27
+TARGET_SDK_VERSION=27
 MIN_SDK_VERSION=14
 
 org.gradle.jvmargs=-Xmx2048M
diff --git a/integration/okhttp/build.gradle b/integration/okhttp/build.gradle
index f86e60534c..627e957bb0 100644
--- a/integration/okhttp/build.gradle
+++ b/integration/okhttp/build.gradle
@@ -4,7 +4,7 @@ dependencies {
     implementation project(':library')
     annotationProcessor project(':annotation:compiler')
 
-    api "com.squareup.okhttp:okhttp:2.7.1"
+    api "com.squareup.okhttp:okhttp:2.7.2"
     api "com.android.support:support-annotations:${ANDROID_SUPPORT_VERSION}"
 }
 
diff --git a/samples/imgur/build.gradle b/samples/imgur/build.gradle
index 16e7cfde51..27dcd1923e 100644
--- a/samples/imgur/build.gradle
+++ b/samples/imgur/build.gradle
@@ -38,12 +38,12 @@ dependencies {
     annotationProcessor "com.google.dagger:dagger-android-processor:${DAGGER_VERSION}"
 
     implementation "com.squareup.okhttp3:okhttp:${OK_HTTP_VERSION}"
-    implementation 'com.squareup.retrofit2:retrofit:2.2.0'
-    implementation 'com.squareup.retrofit2:converter-gson:2.2.0'
-    implementation 'com.squareup.retrofit2:adapter-rxjava:2.2.0'
+    implementation 'com.squareup.retrofit2:retrofit:2.3.0'
+    implementation 'com.squareup.retrofit2:converter-gson:2.3.0'
+    implementation 'com.squareup.retrofit2:adapter-rxjava:2.3.0'
 
     implementation 'io.reactivex:rxandroid:1.2.1'
-    implementation 'io.reactivex:rxjava:1.2.9'
+    implementation 'io.reactivex:rxjava:1.3.4'
 
     implementation "com.android.support:appcompat-v7:${ANDROID_SUPPORT_VERSION}"
     implementation "com.android.support:cardview-v7:${ANDROID_SUPPORT_VERSION}"
@@ -51,7 +51,7 @@ dependencies {
 
     // Fixes a compilation warning related to dagger, see
     // https://github.com/google/guava/issues/2721.
-    compileOnly "com.google.errorprone:error_prone_annotations:2.0.19"
+    compileOnly "com.google.errorprone:error_prone_annotations:2.1.3"
 }
 
 task run(type: Exec, dependsOn: 'installDebug') {