diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 0c76dc2..a8b5cc3 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -15,6 +15,9 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: 'go.mod'
       - name: golangci-lint
         uses: golangci/golangci-lint-action@v4
         with:
@@ -41,18 +44,38 @@ jobs:
         run: make cover
 
       - name: Upload coverage results to Codecov
-        uses: codecov/codecov-action@v1
+        uses: codecov/codecov-action@v4
         with:
-          fail_ci_if_error: false
-          path_to_write_report: ./coverage.txt
+          token: ${{ secrets.CODECOV_TOKEN }}
+          slug: nspcc-dev/neo-exporter
+          fail_ci_if_error: true
+          files: ./coverage.txt
           verbose: true
 
   tests:
     name: Tests
-    runs-on: ubuntu-22.04
+    runs-on: ${{ matrix.os }}
     strategy:
       matrix:
+        os: [ubuntu-22.04, windows-2022, macos-12, macos-14]
         go_versions: [ '1.20', '1.21', '1.22' ]
+        exclude:
+          # Only latest Go version for Windows and MacOS.
+          - os: windows-2022
+            go_versions: '1.20'
+          - os: windows-2022
+            go_versions: '1.21'
+          - os: macos-12
+            go_versions: '1.20'
+          - os: macos-12
+            go_versions: '1.21'
+          - os: macos-14
+            go_versions: '1.20'
+          - os: macos-14
+            go_versions: '1.21'
+          # Exclude latest Go version for Ubuntu as Coverage uses it.
+          - os: ubuntu-22.04
+            go_versions: '1.22'
       fail-fast: false
     steps:
       - uses: actions/checkout@v4
@@ -67,3 +90,48 @@ jobs:
 
       - name: Run tests
         run: make test
+
+  codeql:
+    name: CodeQL
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [ 'go' ]
+        # CodeQL supports [ 'cpp', 'csharp', 'go', 'java', 'javascript', 'python' ]
+        # Learn more:
+        # https://docs.github.com/en/free-pro-team@latest/github/finding-security-vulnerabilities-and-errors-in-your-code/configuring-code-scanning#changing-the-languages-that-are-analyzed
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v4
+
+    # Initializes the CodeQL tools for scanning.
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v2
+      with:
+        languages: ${{ matrix.language }}
+        # If you wish to specify custom queries, you can do so here or in a config file.
+        # By default, queries listed here will override any specified in a config file.
+        # Prefix the list here with "+" to use these queries and those in the config file.
+        # queries: ./path/to/local/query, your-org/your-repo/queries@main
+
+    # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
+    # If this step fails, then you should remove it and run the build manually (see below)
+    - name: Autobuild
+      uses: github/codeql-action/autobuild@v2
+
+    # ℹ️ Command-line programs to run using the OS shell.
+    # 📚 https://git.io/JvXDl
+
+    # ✏️ If the Autobuild fails above, remove it and uncomment the following three lines
+    #    and modify them (or add more) to build your code if your project
+    #    uses a compiled language
+
+    #- run: |
+    #   make bootstrap
+    #   make release
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v2