diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index af871c8..10fa815 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -29,7 +29,7 @@ jobs:
       uses: Swatinem/rust-cache@v2
 
     - name: Build tests
-      run: cargo test --target ${{ matrix.target }} --no-run
+      run: cargo test --target ${{ matrix.target }} --no-run -- --test-threads=1
 
     - name: Run tests
-      run: cargo test --target ${{ matrix.target }} --no-fail-fast
+      run: cargo test --target ${{ matrix.target }} --no-fail-fast -- --test-threads=1
diff --git a/src/package/index.rs b/src/package/index.rs
index 45ee5ba..9f67e34 100644
--- a/src/package/index.rs
+++ b/src/package/index.rs
@@ -154,6 +154,19 @@ impl PackageIndex {
         }
 
         let index_dir = tcli_home.join("index");
+
+        let lookup = index_dir.join("lookup.json");
+        let index = index_dir.join("index.json");
+        let header = index_dir.join("header.json");
+
+        if !index_dir.is_dir() {
+            fs::create_dir(&index_dir)?;
+        }
+
+        if !lookup.is_file() || !index.is_file() || !header.is_file() {
+            PackageIndex::sync(tcli_home).await?;
+        }
+
         let lookup: HashMap<PackageReference, LookupTableEntry> = {
             let contents = fs::read_to_string(index_dir.join("lookup.json"))?;
             serde_json::from_str(&contents)?