diff --git a/.github/workflows/ci-cd.yml b/.github/workflows/ci-cd.yml
index 77145c69..8d5c7f26 100644
--- a/.github/workflows/ci-cd.yml
+++ b/.github/workflows/ci-cd.yml
@@ -19,7 +19,7 @@ jobs:
       - uses: actions/checkout@v1
       - uses: actions/setup-java@v1
         with:
-          java-version: 11
+          java-version: 17
       - name: Cache Grade dependencies
         uses: actions/cache@v1
         with:
diff --git a/app/build.gradle b/app/build.gradle
index 26c8fe00..bfd089ed 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -27,13 +27,13 @@ repositories {
 }
 
 android {
-    compileSdkVersion 33
+    compileSdk 33
     ndkVersion '21.3.6528147'
 
     defaultConfig {
         applicationId "tech.relaycorp.courier"
-        minSdkVersion 23
-        targetSdkVersion 33
+        minSdk 23
+        targetSdk 33
         versionCode 1
         versionName project.findProperty("versionName") ?: "0.1"
 
@@ -78,11 +78,11 @@ android {
     }
     compileOptions {
         coreLibraryDesugaringEnabled true
-        sourceCompatibility = JavaVersion.VERSION_1_8
-        targetCompatibility = JavaVersion.VERSION_1_8
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
     }
     kotlinOptions {
-        jvmTarget = JavaVersion.VERSION_1_8
+        jvmTarget = JavaVersion.VERSION_17
     }
     packagingOptions {
         jniLibs {
diff --git a/app/jacoco.gradle b/app/jacoco.gradle
index 55e5315c..9d576a76 100644
--- a/app/jacoco.gradle
+++ b/app/jacoco.gradle
@@ -46,11 +46,11 @@ task jacocoAndroidTestReport(type: JacocoReport) {
     }
 
     reports {
-        html.enabled true
+        html.required = true
         html.destination file("${buildDir}/reports/coverage")
-        xml.enabled true
+        xml.required = true
         xml.destination file("${buildDir}/reports/coverage.xml")
-        csv.enabled false
+        csv.required = false
     }
 
     doLast {
diff --git a/app/src/test/java/tech/relaycorp/cogrpc/server/CogRPCServerCollectCargoTest.kt b/app/src/test/java/tech/relaycorp/cogrpc/server/CogRPCServerCollectCargoTest.kt
index 0676677a..005f4d3a 100644
--- a/app/src/test/java/tech/relaycorp/cogrpc/server/CogRPCServerCollectCargoTest.kt
+++ b/app/src/test/java/tech/relaycorp/cogrpc/server/CogRPCServerCollectCargoTest.kt
@@ -133,19 +133,19 @@ internal class CogRPCServerCollectCargoTest {
     private fun buildClient() = CargoRelayGrpc.newStub(testServer.channel)
 
     private fun buildClientWithCCA(cca: ByteArray = "CCA".toByteArray()) =
-        MetadataUtils.attachHeaders(
-            buildClient(),
-            AuthorizationMetadata.makeMetadata(cca)
+        buildClient().withInterceptors(
+            MetadataUtils.newAttachHeadersInterceptor(AuthorizationMetadata.makeMetadata(cca))
         )
 
     private fun buildClientWithInvalidAuthorization() =
-        MetadataUtils.attachHeaders(
-            buildClient(),
-            Metadata().also {
-                it.put(
-                    Metadata.Key.of("Authorization", Metadata.ASCII_STRING_MARSHALLER),
-                    "INVALID"
-                )
-            }
+        buildClient().withInterceptors(
+            MetadataUtils.newAttachHeadersInterceptor(
+                Metadata().also {
+                    it.put(
+                        Metadata.Key.of("Authorization", Metadata.ASCII_STRING_MARSHALLER),
+                        "INVALID"
+                    )
+                }
+            )
         )
 }
diff --git a/build.gradle b/build.gradle
index 7aa3f454..f23e4651 100644
--- a/build.gradle
+++ b/build.gradle
@@ -4,7 +4,7 @@ buildscript {
     ext {
         kotlinVersion = '1.8.10'
         kotlinCoroutinesVersion = '1.6.4'
-        grpcVersion = '1.54.0'
+        grpcVersion = '1.59.0'
         nettyVersion = '4.1.78.Final'
         aboutLibsVersion = '8.6.3'
         junitVersion = '5.9.0'
@@ -16,7 +16,7 @@ buildscript {
         mavenCentral()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:7.4.2'
+        classpath 'com.android.tools.build:gradle:8.1.4'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlinVersion"
         classpath 'com.diffplug.spotless:spotless-plugin-gradle:6.7.2'
         classpath "com.mikepenz.aboutlibraries.plugin:aboutlibraries-plugin:$aboutLibsVersion"
diff --git a/gradle.properties b/gradle.properties
index 64265023..b4e2362d 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -20,3 +20,6 @@ android.enableJetifier=true
 android.jetifier.ignorelist=bouncycastle
 # Kotlin code style for this project: "official" or "obsolete":
 kotlin.code.style=official
+android.defaults.buildfeatures.buildconfig=true
+android.nonTransitiveRClass=false
+android.nonFinalResIds=false
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
index 943f0cbf..c1962a79 100644
Binary files a/gradle/wrapper/gradle-wrapper.jar and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index f398c33c..0c85a1f7 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.6-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.1-bin.zip
 networkTimeout=10000
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/gradlew b/gradlew
index 65dcd68d..aeb74cbb 100755
--- a/gradlew
+++ b/gradlew
@@ -85,9 +85,6 @@ done
 APP_BASE_NAME=${0##*/}
 APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
 
-# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
-
 # Use the maximum available, or set MAX_FD != -1 to use that value.
 MAX_FD=maximum
 
@@ -144,7 +141,7 @@ if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
     case $MAX_FD in #(
       max*)
         # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
-        # shellcheck disable=SC3045 
+        # shellcheck disable=SC3045
         MAX_FD=$( ulimit -H -n ) ||
             warn "Could not query maximum file descriptor limit"
     esac
@@ -152,7 +149,7 @@ if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
       '' | soft) :;; #(
       *)
         # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
-        # shellcheck disable=SC3045 
+        # shellcheck disable=SC3045
         ulimit -n "$MAX_FD" ||
             warn "Could not set maximum file descriptor limit to $MAX_FD"
     esac
@@ -197,6 +194,10 @@ if "$cygwin" || "$msys" ; then
     done
 fi
 
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
 # Collect all arguments for the java command;
 #   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
 #     shell script including quotes and variable substitutions, so put them in