diff --git a/app-k9mail/dependencies/releaseRuntimeClasspath.txt b/app-k9mail/dependencies/releaseRuntimeClasspath.txt
index d128d0228f..7a84713460 100644
--- a/app-k9mail/dependencies/releaseRuntimeClasspath.txt
+++ b/app-k9mail/dependencies/releaseRuntimeClasspath.txt
@@ -167,6 +167,7 @@ org.apache.james:apache-mime4j-core:0.8.9
 org.apache.james:apache-mime4j-dom:0.8.9
 org.jetbrains.compose.runtime:runtime:1.5.11
 org.jetbrains.kotlin:kotlin-android-extensions-runtime:1.9.22
+org.jetbrains.kotlin:kotlin-bom:1.9.22
 org.jetbrains.kotlin:kotlin-parcelize-runtime:1.9.22
 org.jetbrains.kotlin:kotlin-stdlib-common:1.9.22
 org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.9.22
diff --git a/build-plugin/build.gradle.kts b/build-plugin/build.gradle.kts
index 10e0b08181..e558aad65b 100644
--- a/build-plugin/build.gradle.kts
+++ b/build-plugin/build.gradle.kts
@@ -18,6 +18,10 @@ dependencies {
 
     implementation(libs.diff.utils)
     compileOnly(libs.android.tools.common)
+
+    // This defines the used Kotlin version for all Plugin dependencies
+    // and ensures that transitive dependencies are aligned on one version.
+    implementation(platform(libs.kotlin.gradle.bom))
 }
 
 fun plugin(provider: Provider<PluginDependency>) = with(provider.get()) {
diff --git a/build-plugin/src/main/kotlin/thunderbird.app.android.gradle.kts b/build-plugin/src/main/kotlin/thunderbird.app.android.gradle.kts
index c4719de496..7ef73bb00d 100644
--- a/build-plugin/src/main/kotlin/thunderbird.app.android.gradle.kts
+++ b/build-plugin/src/main/kotlin/thunderbird.app.android.gradle.kts
@@ -37,6 +37,8 @@ android {
 dependencies {
     coreLibraryDesugaring(libs.android.desugar)
 
+    implementation(platform(libs.kotlin.bom))
+
     implementation(libs.bundles.shared.jvm.android.app)
 
     testImplementation(libs.bundles.shared.jvm.test)
diff --git a/build-plugin/src/main/kotlin/thunderbird.app.jvm.gradle.kts b/build-plugin/src/main/kotlin/thunderbird.app.jvm.gradle.kts
index b95f2d83c2..9c7b99d55f 100644
--- a/build-plugin/src/main/kotlin/thunderbird.app.jvm.gradle.kts
+++ b/build-plugin/src/main/kotlin/thunderbird.app.jvm.gradle.kts
@@ -12,6 +12,8 @@ java {
 configureKotlinJavaCompatibility()
 
 dependencies {
+    implementation(platform(libs.kotlin.bom))
+
     implementation(libs.bundles.shared.jvm.main)
     testImplementation(libs.bundles.shared.jvm.test)
 }
diff --git a/build-plugin/src/main/kotlin/thunderbird.library.android.gradle.kts b/build-plugin/src/main/kotlin/thunderbird.library.android.gradle.kts
index fedfca3e23..bc47ab6902 100644
--- a/build-plugin/src/main/kotlin/thunderbird.library.android.gradle.kts
+++ b/build-plugin/src/main/kotlin/thunderbird.library.android.gradle.kts
@@ -27,6 +27,8 @@ android {
 }
 
 dependencies {
+    implementation(platform(libs.kotlin.bom))
+
     implementation(libs.bundles.shared.jvm.main)
     implementation(libs.bundles.shared.jvm.android)
 
diff --git a/build-plugin/src/main/kotlin/thunderbird.library.jvm.gradle.kts b/build-plugin/src/main/kotlin/thunderbird.library.jvm.gradle.kts
index 7a6af3f328..af7835c2f5 100644
--- a/build-plugin/src/main/kotlin/thunderbird.library.jvm.gradle.kts
+++ b/build-plugin/src/main/kotlin/thunderbird.library.jvm.gradle.kts
@@ -21,6 +21,8 @@ tasks.withType<Jar> {
 configureKotlinJavaCompatibility()
 
 dependencies {
+    implementation(platform(libs.kotlin.bom))
+
     implementation(libs.bundles.shared.jvm.main)
     testImplementation(libs.bundles.shared.jvm.test)
 }
diff --git a/build.gradle.kts b/build.gradle.kts
index 1f81442306..d3595f6db5 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -45,12 +45,6 @@ allprojects {
                 .using(module("androidx.transition:transition:${libs.versions.androidxTransition.get()}"))
             substitute(module("org.jetbrains:annotations"))
                 .using(module("org.jetbrains:annotations:${libs.versions.jetbrainsAnnotations.get()}"))
-            substitute(module("org.jetbrains.kotlin:kotlin-stdlib"))
-                .using(module("org.jetbrains.kotlin:kotlin-stdlib:${libs.versions.kotlin.get()}"))
-            substitute(module("org.jetbrains.kotlin:kotlin-stdlib-jdk7"))
-                .using(module("org.jetbrains.kotlin:kotlin-stdlib-jdk7:${libs.versions.kotlin.get()}"))
-            substitute(module("org.jetbrains.kotlin:kotlin-stdlib-jdk8"))
-                .using(module("org.jetbrains.kotlin:kotlin-stdlib-jdk8:${libs.versions.kotlin.get()}"))
             substitute(module("org.jetbrains.kotlinx:kotlinx-coroutines-android"))
                 .using(
                     module(
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index a91f626403..84792c2bc6 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -72,7 +72,9 @@ koinCore = "3.5.3"
 koinAndroid = "3.5.3"
 koinAndroidCompose = "3.5.3"
 koinTest = "3.5.3"
-kotlin = "1.9.22"
+kotlinBom = "1.9.22"
+# Needs to match the version used by Gradle, just check with `./gradlew --version`
+kotlinGradleBom = "1.9.20"
 kotlinKsp = "1.9.22-1.0.17"
 kotlinxCoroutines = "1.8.0"
 kotlinxDateTime = "0.5.0"
@@ -105,9 +107,9 @@ android-test = { id = "com.android.test", version.ref = "androidGradlePlugin" }
 dependency-check = { id = "com.github.ben-manes.versions", version.ref = "dependencyCheckPlugin" }
 dependency-guard = { id = "com.dropbox.dependency-guard", version.ref = "dependencyGuardPlugin" }
 detekt = { id = "io.gitlab.arturbosch.detekt", version.ref = "detektPlugin" }
-kotlin-android = { id = "org.jetbrains.kotlin.android", version.ref = "kotlin" }
-kotlin-jvm = { id = "org.jetbrains.kotlin.jvm", version.ref = "kotlin" }
-kotlin-parcelize = { id = "org.jetbrains.kotlin.plugin.parcelize", version.ref = "kotlin" }
+kotlin-android = { id = "org.jetbrains.kotlin.android", version.ref = "kotlinBom" }
+kotlin-jvm = { id = "org.jetbrains.kotlin.jvm", version.ref = "kotlinBom" }
+kotlin-parcelize = { id = "org.jetbrains.kotlin.plugin.parcelize", version.ref = "kotlinBom" }
 ksp = { id = "com.google.devtools.ksp", version.ref = "kotlinKsp" }
 spotless = { id = "com.diffplug.spotless", version.ref = "spotlessPlugin" }
 
@@ -194,9 +196,11 @@ koin-android = { module = "io.insert-koin:koin-android", version.ref = "koinAndr
 koin-androidx-compose = { module = "io.insert-koin:koin-androidx-compose", version.ref = "koinAndroidCompose" }
 koin-test = { module = "io.insert-koin:koin-test", version.ref = "koinTest" }
 koin-test-junit4 = { module = "io.insert-koin:koin-test-junit4", version.ref = "koinTest" }
-kotlin-reflect = { module = "org.jetbrains.kotlin:kotlin-reflect", version.ref = "kotlin" }
-kotlin-stdlib = { module = "org.jetbrains.kotlin:kotlin-stdlib", version.ref = "kotlin" }
-kotlin-test = { module = "org.jetbrains.kotlin:kotlin-test", version.ref = "kotlin" }
+kotlin-bom = { module = "org.jetbrains.kotlin:kotlin-bom", version.ref = "kotlinBom" }
+kotlin-gradle-bom = { module = "org.jetbrains.kotlin:kotlin-bom", version.ref = "kotlinGradleBom" }
+kotlin-reflect = { module = "org.jetbrains.kotlin:kotlin-reflect" }
+kotlin-stdlib = { module = "org.jetbrains.kotlin:kotlin-stdlib" }
+kotlin-test = { module = "org.jetbrains.kotlin:kotlin-test" }
 kotlinx-collections-immutable = "org.jetbrains.kotlinx:kotlinx-collections-immutable:0.3.7"
 kotlinx-coroutines-android = { module = "org.jetbrains.kotlinx:kotlinx-coroutines-android", version.ref = "kotlinxCoroutines" }
 kotlinx-coroutines-core = { module = "org.jetbrains.kotlinx:kotlinx-coroutines-core", version.ref = "kotlinxCoroutines" }