diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index e1b1633..30b611a 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -11,12 +11,18 @@ androidx-lifecycle = "2.10.0"
 androidx-testExt = "1.3.0"
 composeHotReload = "1.0.0"
 composeMultiplatform = "1.10.3"
+flyway = "12.4.0"
 junit = "4.13.2"
+kermit = "2.1.0"
+koin = "4.2.1"
 kotlin = "2.3.20"
 kotlinx-coroutines = "1.10.2"
+kotlinx-serialization = "1.7.3"
 ktor = "3.4.1"
 logback = "1.5.32"
 material3 = "1.10.0-alpha05"
+postgresql = "42.7.10"
+spotless = "8.4.0"
 
 [libraries]
 kotlin-test = { module = "org.jetbrains.kotlin:kotlin-test", version.ref = "kotlin" }
@@ -42,6 +48,23 @@ ktor-serverCore = { module = "io.ktor:ktor-server-core-jvm", version.ref = "ktor
 ktor-serverNetty = { module = "io.ktor:ktor-server-netty-jvm", version.ref = "ktor" }
 ktor-serverTestHost = { module = "io.ktor:ktor-server-test-host-jvm", version.ref = "ktor" }
 
+# Koin (client DI — D-14)
+koin-bom = { module = "io.insert-koin:koin-bom", version.ref = "koin" }
+koin-core = { module = "io.insert-koin:koin-core" }
+koin-compose = { module = "io.insert-koin:koin-compose" }
+koin-composeViewmodel = { module = "io.insert-koin:koin-compose-viewmodel" }
+koin-android = { module = "io.insert-koin:koin-android" }
+
+# Kermit (client logger — D-15)
+kermit = { module = "co.touchlab:kermit", version.ref = "kermit" }
+
+# Server: Ktor content-negotiation + JSON serializer + Flyway + Postgres (D-16)
+ktor-serverContentNegotiation = { module = "io.ktor:ktor-server-content-negotiation-jvm", version.ref = "ktor" }
+ktor-serializationKotlinxJson = { module = "io.ktor:ktor-serialization-kotlinx-json-jvm", version.ref = "ktor" }
+flyway-core = { module = "org.flywaydb:flyway-core", version.ref = "flyway" }
+flyway-database-postgresql = { module = "org.flywaydb:flyway-database-postgresql", version.ref = "flyway" }
+postgresql = { module = "org.postgresql:postgresql", version.ref = "postgresql" }
+
 [plugins]
 androidApplication = { id = "com.android.application", version.ref = "agp" }
 androidLibrary = { id = "com.android.library", version.ref = "agp" }
@@ -50,4 +73,6 @@ composeMultiplatform = { id = "org.jetbrains.compose", version.ref = "composeMul
 composeCompiler = { id = "org.jetbrains.kotlin.plugin.compose", version.ref = "kotlin" }
 kotlinJvm = { id = "org.jetbrains.kotlin.jvm", version.ref = "kotlin" }
 ktor = { id = "io.ktor.plugin", version.ref = "ktor" }
-kotlinMultiplatform = { id = "org.jetbrains.kotlin.multiplatform", version.ref = "kotlin" }
\ No newline at end of file
+kotlinMultiplatform = { id = "org.jetbrains.kotlin.multiplatform", version.ref = "kotlin" }
+spotless = { id = "com.diffplug.spotless", version.ref = "spotless" }
+flywayPlugin = { id = "org.flywaydb.flyway", version.ref = "flyway" }