diff --git a/CHANGELOG.md b/CHANGELOG.md
index 84ecf4e20a..b518cd47b3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,10 +1,15 @@
 # v130.0 (In progress)
 
+## ✨ What's New ✨
+
 ### Suggest
 - Added support for Fakespot suggestions.
 
 ## 🦊 What's Changed 🦊
 
+### Android
+- Upgraded NDK from r26c to r27. ([#6305](https://github.com/mozilla/application-services/pull/6305))
+
 ### Nimbus FML
 - The output order should be deterministic again ([#6283](https://github.com/mozilla/application-services/pull/6283))
 
diff --git a/build.gradle b/build.gradle
index 3610dccc1e..462e5bd06d 100644
--- a/build.gradle
+++ b/build.gradle
@@ -2,7 +2,7 @@
 
 buildscript {
     ext.build = [
-        ndkVersion: "26.2.11394342", // Keep it in sync in TC Dockerfile.
+        ndkVersion: "27.0.12077973", // Keep it in sync in TC Dockerfile.
 
         // In general, we should aim to keep these in sync with AC
         compileSdkVersion: 34,
diff --git a/components/support/rc_crypto/nss/nss_build_common/src/lib.rs b/components/support/rc_crypto/nss/nss_build_common/src/lib.rs
index 82956f9430..c5fbf7f5cf 100644
--- a/components/support/rc_crypto/nss/nss_build_common/src/lib.rs
+++ b/components/support/rc_crypto/nss/nss_build_common/src/lib.rs
@@ -92,13 +92,13 @@ fn link_nss_libs(kind: LinkingKind) {
     let target_arch = env::var("CARGO_CFG_TARGET_ARCH").unwrap();
     if target_arch == "x86_64" && target_os == "android" {
         let android_home = env::var("ANDROID_HOME").expect("ANDROID_HOME not set");
-        const ANDROID_NDK_VERSION: &str = "26.2.11394342";
+        const ANDROID_NDK_VERSION: &str = "27.0.12077973";
         // One of these will exist, depending on the host platform.
         const DARWIN_X86_64_LIB_DIR: &str =
-            "/toolchains/llvm/prebuilt/darwin-x86_64/lib/clang/17/lib/linux/";
+            "/toolchains/llvm/prebuilt/darwin-x86_64/lib/clang/18/lib/linux/";
         println!("cargo:rustc-link-search={android_home}/ndk/{ANDROID_NDK_VERSION}/{DARWIN_X86_64_LIB_DIR}");
         const LINUX_X86_64_LIB_DIR: &str =
-            "/toolchains/llvm/prebuilt/linux-x86_64/lib/clang/17/lib/linux/";
+            "/toolchains/llvm/prebuilt/linux-x86_64/lib/clang/18/lib/linux/";
         println!("cargo:rustc-link-search={android_home}/ndk/{ANDROID_NDK_VERSION}/{LINUX_X86_64_LIB_DIR}");
         println!("cargo:rustc-link-lib=static=clang_rt.builtins-x86_64-android");
     }
diff --git a/docs/building.md b/docs/building.md
index 2420c6bd68..fa4d1032c1 100644
--- a/docs/building.md
+++ b/docs/building.md
@@ -107,8 +107,8 @@ The following instructions assume that you are building `application-services` f
    1. Set `ANDROID_SDK_ROOT` and `ANDROID_HOME` to the Android Studio sdk location and add it to your rc file (either `.zshrc` or `.bashrc` depending on the shell you use for your terminal).
    1. Configure the required versions of NDK
   `Configure menu > System Settings > Android SDK > SDK Tools > NDK > Show Package Details > NDK (Side by side)`
-        - 25.1.8937393 (required by Fenix; note: a specific NDK version isn't configured, this maps to default [NDK version](https://developer.android.com/studio/projects/install-ndk#default-ndk-per-agp) for the [AGP version](https://github.com/mozilla-mobile/firefox-android/blob/main/android-components/plugins/dependencies/src/main/java/DependenciesPlugin.kt#L31))
-        - 26.2.11394342 (required by Application Services, [as configured](https://github.com/mozilla/application-services/blob/main/build.gradle#L33))
+        - 26.2.11394342 (required by Fenix; note: a specific NDK version isn't configured, this maps to default [NDK version](https://developer.android.com/studio/projects/install-ndk#default-ndk-per-agp) for the [AGP version](https://searchfox.org/mozilla-central/source/mobile/android/android-components/plugins/dependencies/src/main/java/DependenciesPlugin.kt#33))
+        - 27.0.12077973 (required by Application Services, [as configured](https://github.com/mozilla/application-services/blob/main/build.gradle#L33))
 1. If you are on Windows using WSL - drop to the section below, [Windows setup
 for Android (WSL)](building.md#windows-setup-for-android-via-wsl) before proceeding.
 1. Check dependencies, environment variables
diff --git a/docs/howtos/locally-building-jna.md b/docs/howtos/locally-building-jna.md
index 08bb94e94f..c7e9c54cc0 100644
--- a/docs/howtos/locally-building-jna.md
+++ b/docs/howtos/locally-building-jna.md
@@ -17,7 +17,7 @@ Here are the steps that worked for me:
   for each target platform are in your `$PATH`. On my Mac with Android Studio the
   config was as follows:
     ```
-    export NDK_ROOT="$HOME/Library/Android/sdk/ndk/26.2.11394342"
+    export NDK_ROOT="$HOME/Library/Android/sdk/ndk/27.0.12077973"
     export NDK_PLATFORM="$NDK_ROOT/platforms/android-25"
     export PATH="$PATH:$NDK_ROOT/toolchains/llvm/prebuilt/darwin-x86_64/bin"
     export PATH="$PATH:$NDK_ROOT/toolchains/aarch64-linux-android-4.9/prebuilt/darwin-x86_64/bin"
diff --git a/libs/build-nss-desktop.sh b/libs/build-nss-desktop.sh
index ebdd39d10f..3e8b5f6d0d 100755
--- a/libs/build-nss-desktop.sh
+++ b/libs/build-nss-desktop.sh
@@ -63,7 +63,7 @@ if [[ "${CROSS_COMPILE_TARGET}" =~ "darwin" ]]; then
   else
     # From https://firefox-ci-tc.services.mozilla.com/tasks/index/app-services.cache.level-3.content.v1.nss-artifact/latest
     curl -sfSL --retry 5 --retry-delay 10 -O "https://firefox-ci-tc.services.mozilla.com/api/index/v1/task/app-services.cache.level-3.content.v1.nss-artifact.latest/artifacts/public%2Fdist.tar.bz2"
-    SHA256="af861dbda0c03551f1cce90ca0ebc45c0a282b9b9e504189fb86d4dce4f1103f"
+    SHA256="675aed4045d48c0c25791a7ba8e6b3a0417eda7ce803c79ef2b044c6f4b2150c"
     echo "${SHA256}  dist.tar.bz2" | shasum -a 256 -c - || exit 2
     tar xvjf dist.tar.bz2 && rm -rf dist.tar.bz2
     NSS_DIST_DIR=$(abspath "dist")
diff --git a/taskcluster/docker/linux/Dockerfile b/taskcluster/docker/linux/Dockerfile
index 0d4aaa4165..e3c42ce636 100644
--- a/taskcluster/docker/linux/Dockerfile
+++ b/taskcluster/docker/linux/Dockerfile
@@ -19,7 +19,7 @@ WORKDIR /builds/worker/
 ENV ANDROID_BUILD_TOOLS "34.0.0"
 ENV ANDROID_TOOLS_VERSION "11076708"
 ENV ANDROID_PLATFORM_VERSION "34"
-ENV ANDROID_NDK_VERSION "26.2.11394342"
+ENV ANDROID_NDK_VERSION "27.0.12077973"
 
 # Set up the language variables to avoid problems (we run locale-gen later).
 ENV LANG en_US.UTF-8
diff --git a/taskcluster/kinds/fetch/kind.yml b/taskcluster/kinds/fetch/kind.yml
index e46bc7e85d..b27b0f9b9c 100644
--- a/taskcluster/kinds/fetch/kind.yml
+++ b/taskcluster/kinds/fetch/kind.yml
@@ -37,6 +37,6 @@ tasks:
         description: fetches the built NSS artifacts from NSS CI
         fetch:
             type: static-url
-            url: https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/Soqz2ocqTxmbzwZ1yUuZOw/runs/0/artifacts/public/dist.tar.bz2
-            sha256: af861dbda0c03551f1cce90ca0ebc45c0a282b9b9e504189fb86d4dce4f1103f
-            size: 23660664
+            url: https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/w-rkVgqxQJij9zQdlmVduQ/runs/0/artifacts/public/dist.tar.bz2
+            sha256: 675aed4045d48c0c25791a7ba8e6b3a0417eda7ce803c79ef2b044c6f4b2150c
+            size: 23720915