diff --git a/.github/workflows/build-ios-sim.yml b/.github/workflows/build-ios-sim.yml
index 959ddee6..ea60e50b 100644
--- a/.github/workflows/build-ios-sim.yml
+++ b/.github/workflows/build-ios-sim.yml
@@ -75,6 +75,24 @@ jobs:
           fi
           pod --version
 
+      - name: Install Rust + iOS targets (if missing)
+        run: |
+          if ! command -v rustup >/dev/null; then
+            curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain stable --no-modify-path
+            echo "$HOME/.cargo/bin" >> "$GITHUB_PATH"
+            export PATH="$HOME/.cargo/bin:$PATH"
+          fi
+          # Clean any partial downloads from a previously crashed install — those
+          # are the source of the 'could not rename .partial → final: No such
+          # file or directory' race that breaks parallel pod builds.
+          rm -rf "$HOME/.rustup/downloads"/*.partial 2>/dev/null || true
+          # Pre-install iOS targets serially so the pod build doesn't try to
+          # do it under concurrency.
+          rustup target add aarch64-apple-ios
+          rustup target add aarch64-apple-ios-sim
+          rustup target add x86_64-apple-ios
+          rustup show
+
       - name: Install Go + gomobile (if missing)
         run: |
           if ! command -v go >/dev/null; then
diff --git a/.github/workflows/build-ios-testflight.yml b/.github/workflows/build-ios-testflight.yml
index 81431621..f7be36a5 100644
--- a/.github/workflows/build-ios-testflight.yml
+++ b/.github/workflows/build-ios-testflight.yml
@@ -79,6 +79,19 @@ jobs:
           fi
           pod --version
 
+      - name: Install Rust + iOS targets (if missing)
+        run: |
+          if ! command -v rustup >/dev/null; then
+            curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain stable --no-modify-path
+            echo "$HOME/.cargo/bin" >> "$GITHUB_PATH"
+            export PATH="$HOME/.cargo/bin:$PATH"
+          fi
+          rm -rf "$HOME/.rustup/downloads"/*.partial 2>/dev/null || true
+          rustup target add aarch64-apple-ios
+          rustup target add aarch64-apple-ios-sim
+          rustup target add x86_64-apple-ios
+          rustup show
+
       - name: Install Go + gomobile (if missing)
         run: |
           if ! command -v go >/dev/null; then