diff --git a/.circleci/config.yml b/.circleci/config.yml
index 2a7aa1d2d8a5bfe5f5409da555eba10729bbec8c..7d0ae9878ca1ee536fb639e7d081a61edfb8d011 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -11,8 +11,8 @@ jobs:
     steps:
       - checkout
       - install-ndk:
-          ndk-sha: "c81a5bcb4672a18d3647bf6898cd4dbcb978d0e8"
-          ndk-version: "android-ndk-r21c"
+          ndk-sha: "50250fcba479de477b45801e2699cca47f7e1267"
+          ndk-version: "android-ndk-r21b"
       - restore-build-cache
       - restore_cache:
           key: jars-{{ checksum "build.gradle" }}-{{ checksum  "Corona-Warn-App/build.gradle" }}-{{ checksum  "Server-Protocol-Buffer/build.gradle" }}
diff --git a/Corona-Warn-App/build.gradle b/Corona-Warn-App/build.gradle
index ab1083da7e60a6ebafc44d09e8d8251982ec2adb..42d442549310ad69e220027d210ea5411aade42c 100644
--- a/Corona-Warn-App/build.gradle
+++ b/Corona-Warn-App/build.gradle
@@ -25,7 +25,7 @@ apply plugin: "androidx.navigation.safeargs.kotlin"
 apply plugin: 'jacoco'
 
 android {
-    ndkVersion "21.2.6472646"
+    ndkVersion "21.1.6352462"
     compileSdkVersion 29
     buildToolsVersion "29.0.3"