diff --git a/.gitea/workflows/deploy.yml b/.gitea/workflows/deploy.yml
index db28674..23f9f13 100644
--- a/.gitea/workflows/deploy.yml
+++ b/.gitea/workflows/deploy.yml
@@ -13,21 +13,44 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
+      - name: Cache Go SDK + modules
+        uses: actions/cache@v3
+        with:
+          path: |
+            /usr/local/go
+            ~/go/pkg/mod
+            ~/.cache/go-build
+          key: go-${{ hashFiles('backend/go.mod') }}
+          restore-keys: go-
+
       - name: Install Go
         run: |
-          GO_VERSION=$(grep '^go ' backend/go.mod | awk '{print $2}')
-          curl -fsSL https://golang.google.cn/dl/go${GO_VERSION}.linux-amd64.tar.gz -o /tmp/go.tar.gz
-          sudo tar -C /usr/local -xzf /tmp/go.tar.gz
+          if [ ! -f /usr/local/go/bin/go ]; then
+            GO_VERSION=$(grep '^go ' backend/go.mod | awk '{print $2}')
+            curl -fsSL https://golang.google.cn/dl/go${GO_VERSION}.linux-amd64.tar.gz -o /tmp/go.tar.gz
+            sudo tar -C /usr/local -xzf /tmp/go.tar.gz
+          fi
           echo "/usr/local/go/bin" >> $GITHUB_PATH
 
       - name: Go tests
         working-directory: backend
         run: go test ./...
 
+      - name: Cache Flutter SDK + pub
+        uses: actions/cache@v3
+        with:
+          path: |
+            /opt/flutter
+            ~/.pub-cache
+          key: flutter-3.41.6-${{ hashFiles('client/pubspec.lock') }}
+          restore-keys: flutter-3.41.6-
+
       - name: Install Flutter
         run: |
-          curl -fsSL https://storage.flutter-io.cn/flutter_infra_release/releases/stable/linux/flutter_linux_3.41.6-stable.tar.xz -o /tmp/flutter.tar.xz
-          sudo tar -C /opt -xf /tmp/flutter.tar.xz
+          if [ ! -f /opt/flutter/bin/flutter ]; then
+            curl -fsSL https://storage.flutter-io.cn/flutter_infra_release/releases/stable/linux/flutter_linux_3.41.6-stable.tar.xz -o /tmp/flutter.tar.xz
+            sudo tar -C /opt -xf /tmp/flutter.tar.xz
+          fi
           echo "/opt/flutter/bin" >> $GITHUB_PATH
         env:
           PUB_HOSTED_URL: https://pub.flutter-io.cn