diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7696bb7..1dd09d8 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -27,21 +27,32 @@ jobs:
       - run: ruff check . && black --check . --target-version py312 && mypy pyfragment
 
   test:
-    name: Tests
+    name: Tests (Python ${{ matrix.python-version }})
     runs-on: ubuntu-latest
     env:
       FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: true
       COOKIES_JSON: ${{ secrets.COOKIES_JSON }}
 
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["3.12", "3.13", "3.14"]
+
     steps:
       - uses: actions/checkout@v6.0.2
 
-      - uses: actions/setup-python@v6.2.0
+      - name: Set up conda (Miniconda)
+        uses: conda-incubator/setup-miniconda@v3
         with:
-          python-version: "3.12"
+          auto-update-conda: true
+          python-version: ${{ matrix.python-version }}
+          activate-environment: pyfragment-test
+          auto-activate-base: false
 
-      - uses: astral-sh/setup-uv@v7.6.0
+      - name: Install package and dev dependencies
+        shell: bash -el {0}
+        run: pip install ".[dev]"
 
-      - run: uv pip install --system ".[dev]"
-
-      - run: pytest
+      - name: Run tests
+        shell: bash -el {0}
+        run: pytest
diff --git a/pyfragment/utils/http.py b/pyfragment/utils/http.py
index d21702e..cffc227 100644
--- a/pyfragment/utils/http.py
+++ b/pyfragment/utils/http.py
@@ -114,7 +114,7 @@ async def fragment_request(
 
 async def execute_transaction_request(
     session: httpx.AsyncClient,
-    headers: dict,
+    headers: dict[str, str],
     tx_data: dict[str, Any],
     fragment_hash: str,
 ) -> dict[str, Any]:
diff --git a/pyfragment/utils/wallet.py b/pyfragment/utils/wallet.py
index db4620c..6587786 100644
--- a/pyfragment/utils/wallet.py
+++ b/pyfragment/utils/wallet.py
@@ -16,7 +16,7 @@ if TYPE_CHECKING:
     from pyfragment.client import FragmentClient
 
 
-async def process_transaction(client: "FragmentClient", transaction_data: dict) -> str:
+async def process_transaction(client: "FragmentClient", transaction_data: dict[str, Any]) -> str:
     """Sign and broadcast a Fragment transaction to the TON network.
 
     Validates the payload structure, checks the wallet balance, decodes the
diff --git a/pyproject.toml b/pyproject.toml
index 753fb5e..4655514 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -27,7 +27,7 @@ classifiers = [
 ]
 dependencies = [
     "httpx==0.28.1",
-    "tonutils[pytoniq]==2.0.4",
+    "tonutils[pytoniq]==2.0.5",
 ]
 
 [project.optional-dependencies]