diff --git a/build.gradle.kts b/build.gradle.kts
index 0e67478..20490c9 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -1,7 +1,7 @@
 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 
 plugins {
-    kotlin("jvm") version "1.3.41"
+    kotlin("jvm") version "1.3.50"
     id("com.github.johnrengelman.shadow") version "5.1.0" apply true
     application
 }
@@ -38,13 +38,13 @@ dependencies {
     implementation(kotlin("stdlib-jdk8"))
     implementation("org.javacord:javacord:3.0.4")
     implementation("org.mapdb:mapdb:3.0.7")
-    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.0-RC")
+    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.1")
 
-    testImplementation("io.kotlintest:kotlintest-runner-junit5:3.3.2")
+    testImplementation("io.kotlintest:kotlintest-runner-junit5:3.4.1")
     testImplementation("io.mockk:mockk:1.9.3")
     // these two are needed to access javacord internals (such as reading from sent embeds during tests)
     testImplementation("org.javacord:javacord-core:3.0.4")
-    testImplementation("com.fasterxml.jackson.core:jackson-databind:2.9.9")
+    testImplementation("com.fasterxml.jackson.core:jackson-databind:2.9.9.3")
 }
 
 tasks.withType<KotlinCompile> {
diff --git a/src/main/kotlin/moe/kageru/kagebot/Util.kt b/src/main/kotlin/moe/kageru/kagebot/Util.kt
index 626cdca..7d53cf3 100644
--- a/src/main/kotlin/moe/kageru/kagebot/Util.kt
+++ b/src/main/kotlin/moe/kageru/kagebot/Util.kt
@@ -54,7 +54,7 @@ object Util {
     }
 
     private fun <T> Optional<T>.toNullable(): T? {
-        return ifNotEmpty { it }
+        return orElse(null)
     }
 
     fun findUser(idOrName: String): User? {
@@ -73,11 +73,13 @@ object Util {
         try {
             join()
         } catch (e: CompletionException) {
-            Log.warn("""Error during CompletableFuture:
+            Log.warn(
+                """Error during CompletableFuture:
                 |$e
                 |${e.localizedMessage}
                 |${e.stackTrace.joinToString("\n\t")}
-            """.trimMargin())
+            """.trimMargin()
+            )
             // we don’t care about this error, but I don’t want to spam stdout
         }
         return isCompletedExceptionally