diff --git a/.github/workflows/mobile-build-validation.yml b/.github/workflows/mobile-build-validation.yml
index 322f129c9..204576d28 100644
--- a/.github/workflows/mobile-build-validation.yml
+++ b/.github/workflows/mobile-build-validation.yml
@@ -43,8 +43,19 @@ jobs:
         run: /usr/local/lib/android/sdk/cmdline-tools/7.0/bin/sdkmanager --install "ndk;23.1.7779620"
       - name: install gomobile
         run: go install golang.org/x/mobile/cmd/gomobile@v0.0.0-20251113184115-a159579294ab
+      # `gomobile init` re-installs gobind from golang.org/x/mobile@latest
+      # regardless of the pin above (cmd/gomobile/init.go: "Make sure gobind is
+      # up to date"), so this step resolves a version nobody chose, on every run.
+      #
+      # setup-go sets GOTOOLCHAIN=local, so that install fails outright once
+      # x/mobile@latest declares a newer Go than go.mod does — which it did on
+      # 2026-08-21, breaking both jobs on every branch at once. GOTOOLCHAIN=auto
+      # lets this one install fetch the toolchain it asks for. Scoped to the
+      # step: the repo's own Go version, and every build below, is unaffected.
       - name: gomobile init
         run: gomobile init
+        env:
+          GOTOOLCHAIN: auto
       - name: build android netbird lib
         run: PATH=$PATH:$(go env GOPATH) gomobile bind -o $GITHUB_WORKSPACE/netbird.aar -javapkg=io.netbird.gomobile -ldflags="-checklinkname=0 -X golang.zx2c4.com/wireguard/ipc.socketDirectory=/data/data/io.netbird.client/cache/wireguard -X github.com/netbirdio/netbird/version.version=buildtest"  $GITHUB_WORKSPACE/client/android
         env:
@@ -64,8 +75,13 @@ jobs:
           go-version-file: "go.mod"
       - name: install gomobile
         run: go install golang.org/x/mobile/cmd/gomobile@v0.0.0-20251113184115-a159579294ab
+      # See the Android job: `gomobile init` re-installs gobind from
+      # golang.org/x/mobile@latest regardless of the pin above, and needs a
+      # toolchain it may pick newer than go.mod's.
       - name: gomobile init
         run: gomobile init
+        env:
+          GOTOOLCHAIN: auto
       - name: build iOS netbird lib
         run: PATH=$PATH:$(go env GOPATH) gomobile bind -target=ios -bundleid=io.netbird.framework -ldflags="-X github.com/netbirdio/netbird/version.version=buildtest" -o ./NetBirdSDK.xcframework ./client/ios/NetBirdSDK
         env: