diff --git a/app/build.gradle.kts b/app/build.gradle.kts
index cafb21e22a93d4b0c23623d7a4443fed1dd71d4a..0e98fbf038f71c641a6abad4639b131233a120c0 100644
--- a/app/build.gradle.kts
+++ b/app/build.gradle.kts
@@ -103,7 +103,7 @@ android {
 }
 
 dependencies {
-  implementation(kotlin("stdlib", "1.5.0"))
+  implementation(kotlin("stdlib", "1.4.31"))
 
   // App Compat
   implementation("com.google.android.material", "material", "1.1.0-alpha10")
diff --git a/app/src/main/java/de/kuschku/quasseldroid/ui/clientsettings/about/AboutFragment.kt b/app/src/main/java/de/kuschku/quasseldroid/ui/clientsettings/about/AboutFragment.kt
index b8976f7459aea3d00f53e7eb08d883151a44c9e1..4468c35edec2508c686dd25a34a7c4d5b5339033 100644
--- a/app/src/main/java/de/kuschku/quasseldroid/ui/clientsettings/about/AboutFragment.kt
+++ b/app/src/main/java/de/kuschku/quasseldroid/ui/clientsettings/about/AboutFragment.kt
@@ -209,7 +209,7 @@ class AboutFragment : DaggerFragment() {
       ),
       Library(
         name = "Kotlin Standard Library",
-        version = "1.5.0",
+        version = "1.4.31",
         license = apache2,
         url = "https://kotlinlang.org/"
       ),
diff --git a/build.gradle.kts b/build.gradle.kts
index 74b20205ca7b27d7d50bb3f89c3742945323556c..5266e2575dba26ee4fba7e99cea7dedddc574a5d 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -26,7 +26,7 @@ buildscript {
   }
   dependencies {
     classpath("com.android.tools.build:gradle:4.1.2")
-    classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:1.5.0")
+    classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:1.4.31")
   }
 }
 
diff --git a/invokergenerator/build.gradle.kts b/invokergenerator/build.gradle.kts
index d4c228f8cf220799364985e0d341f6cb444868bc..5b2e44471da33c5ee9e37dbfa4cdca7bd8a6a8af 100644
--- a/invokergenerator/build.gradle.kts
+++ b/invokergenerator/build.gradle.kts
@@ -29,9 +29,9 @@ tasks.withType<KotlinCompile> {
 }
 
 dependencies {
-  implementation(kotlin("stdlib", "1.5.0"))
+  implementation(kotlin("stdlib", "1.4.31"))
   implementation(project(":invokerannotations"))
-  implementation("org.jetbrains.kotlin", "kotlin-compiler-embeddable", "1.5.0")
+  implementation("org.jetbrains.kotlin", "kotlin-compiler-embeddable", "1.4.31")
   implementation("com.squareup", "kotlinpoet", "1.8.0")
   compileOnly("com.google.auto.service:auto-service:1.0-rc7")
   kapt("com.google.auto.service:auto-service:1.0-rc7")
diff --git a/lib/build.gradle.kts b/lib/build.gradle.kts
index 91134539d2a427e1d04d67d25f4f2b017952dec4..14b450817a93b246fa2885c6cc12550e802b304a 100644
--- a/lib/build.gradle.kts
+++ b/lib/build.gradle.kts
@@ -23,7 +23,7 @@ plugins {
 }
 
 dependencies {
-  implementation(kotlin("stdlib", "1.5.0"))
+  implementation(kotlin("stdlib", "1.4.31"))
 
   implementation("androidx.annotation", "annotation", "1.1.0")
 
diff --git a/lifecycle-ktx/build.gradle.kts b/lifecycle-ktx/build.gradle.kts
index 295cd99f1c779060fa6cab572d68bb41cba5a9c9..f0ecdb5f3426a9a8d43381a00529b0fe27a44a38 100644
--- a/lifecycle-ktx/build.gradle.kts
+++ b/lifecycle-ktx/build.gradle.kts
@@ -22,7 +22,7 @@ plugins {
 }
 
 dependencies {
-  implementation(kotlin("stdlib", "1.5.0"))
+  implementation(kotlin("stdlib", "1.4.31"))
 
   implementation("androidx.annotation", "annotation", "1.1.0")
 
diff --git a/malheur/build.gradle.kts b/malheur/build.gradle.kts
index 43b2a188aad2f5d543520498b480ad88ef411cc3..04f305f3d6922faa4ffeb1ee4d2dd8dbc6d351ea 100644
--- a/malheur/build.gradle.kts
+++ b/malheur/build.gradle.kts
@@ -42,7 +42,7 @@ android {
 }
 
 dependencies {
-  implementation(kotlin("stdlib", "1.5.0"))
+  implementation(kotlin("stdlib", "1.4.31"))
 
   implementation("com.google.code.gson", "gson", "2.8.5")
   implementation("androidx.annotation", "annotation", "1.1.0")
diff --git a/persistence/build.gradle.kts b/persistence/build.gradle.kts
index 0e4f1a71042a2c605eefed389990d3c9fe443834..c315cadd7df7cdb85e1332a37723b7c4bb1ef3ee 100644
--- a/persistence/build.gradle.kts
+++ b/persistence/build.gradle.kts
@@ -49,7 +49,7 @@ android {
 }
 
 dependencies {
-  implementation(kotlin("stdlib", "1.5.0"))
+  implementation(kotlin("stdlib", "1.4.31"))
 
   implementation("androidx.appcompat", "appcompat", "1.1.0")
 
diff --git a/ui_spinner/build.gradle.kts b/ui_spinner/build.gradle.kts
index 77101b242ef5d3dd062e1181611f755337858382..cb655b16ab3acef638e916fb93adfbf93d56acb7 100644
--- a/ui_spinner/build.gradle.kts
+++ b/ui_spinner/build.gradle.kts
@@ -42,6 +42,6 @@ android {
 }
 
 dependencies {
-  implementation(kotlin("stdlib", "1.5.0"))
+  implementation(kotlin("stdlib", "1.4.31"))
   implementation("androidx.appcompat", "appcompat", "1.1.0")
 }
diff --git a/viewmodel/build.gradle.kts b/viewmodel/build.gradle.kts
index 5aa9f48c48a68d87c7bc1f086566d9add60bcd50..60544b7e5d215e92fe6bbcf054b8f39853cec5e0 100644
--- a/viewmodel/build.gradle.kts
+++ b/viewmodel/build.gradle.kts
@@ -42,7 +42,7 @@ android {
 }
 
 dependencies {
-  implementation(kotlin("stdlib", "1.5.0"))
+  implementation(kotlin("stdlib", "1.4.31"))
 
   implementation("androidx.appcompat", "appcompat", "1.1.0")
   withVersion("2.2.0") {