diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index e8c2c34f8..c40a5c7a8 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -214,7 +214,7 @@ jobs:
           build/*.appx
   coverity:
     name: Run Coverity tests
-    if: contains(github.repository, 'open-eid/DigiDoc4-Client') && contains(github.ref, 'coverity_scan')
+    if: github.repository == 'open-eid/DigiDoc4-Client' && contains(github.ref, 'coverity_scan')
     runs-on: ubuntu-20.04
     env:
       TOKEN: ${{ secrets.COVERITY_SCAN_TOKEN }}
@@ -257,3 +257,32 @@ jobs:
           -F version=master \
           -F description="Github Actions CI build" \
           https://scan.coverity.com/builds?project=$PROJECTNAME
+  codeql:
+    name: Run CodeQL tests
+    if: github.repository == 'open-eid/DigiDoc4-Client'
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v3
+      with:
+        submodules: recursive
+    - name: Install dependencies
+      run: sudo apt update -qq && sudo apt install --no-install-recommends -y cmake libldap2-dev gettext libpcsclite-dev libminizip-dev libxml-security-c-dev libqt5svg5-dev qttools5-dev-tools qttools5-dev
+    - name: Download artifact
+      uses: dawidd6/action-download-artifact@v2
+      with:
+        workflow: build.yml
+        branch: master
+        name: debs
+        path: libdigidocpp-pkg
+        repo: open-eid/libdigidocpp
+    - name: Install artifact
+      run: sudo dpkg -i libdigidocpp-pkg/*$(lsb_release -rs)*.deb
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v2
+      with:
+        languages: cpp
+    - name: Autobuild
+      uses: github/codeql-action/autobuild@v2
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v2
\ No newline at end of file
diff --git a/README.md b/README.md
index 2888b4357..03e2b3229 100644
--- a/README.md
+++ b/README.md
@@ -24,9 +24,9 @@
    * Install
 
          # Ubuntu
-         sudo apt install cmake qttools5-dev libqt5svg5-dev qttools5-dev-tools libpcsclite-dev libssl-dev libdigidocpp-dev libldap2-dev gettext pkg-config
+         sudo apt install cmake qt6-tools-dev libqt6core5compat6-dev libqt6svg6-dev libpcsclite-dev libssl-dev libdigidocpp-dev libldap2-dev gettext pkg-config
          # Fedora
-         sudo dnf install qt5-qttools-devel qt5-qtsvg-devel qt5-linguist pcsc-lite-devel openssl-devel libdigidocpp openldap-devel gettext pkg-config
+         sudo dnf install qt6-qtsvg-devel qt6-qttools-devel qt6-qt5compat-devel pcsc-lite-devel openssl-devel libdigidocpp openldap-devel gettext pkg-config
 
    * Also runtime dependency opensc-pkcs11 and pcscd is needed
 
diff --git a/lgtm.yml b/lgtm.yml
deleted file mode 100644
index 9f667c81f..000000000
--- a/lgtm.yml
+++ /dev/null
@@ -1,28 +0,0 @@
-extraction:
-  cpp:
-    prepare:
-      packages: 
-      - cmake
-      - vim-common
-      - xsdcxx
-      - libxml-security-c-dev
-      - zlib1g-dev 
-      - libldap2-dev
-      - gettext
-      - libpcsclite-dev
-      - libminizip-dev
-      - libxml-security-c-dev
-      - libqt5svg5-dev
-      - qttools5-dev-tools
-      - qttools5-dev
-    after_prepare:
-    - git clone --recursive --depth 1 https://github.com/open-eid/libdigidocpp.git
-    - cd libdigidocpp
-    - cmake -DCMAKE_INSTALL_PREFIX=../libdigidocpp-install -DCMAKE_INSTALL_SYSCONFDIR=$PWD/../libdigidocpp-install/etc -DPODOFO_INCLUDE_DIR=NOTFOUND .
-    - make install
-    - cd ..
-    configure:
-      command:
-      - mkdir _lgtm_build_dir
-      - cd _lgtm_build_dir
-      - cmake -DLIBDIGIDOCPP_LIBRARY=../libdigidocpp-install/lib/libdigidocpp.so -DLIBDIGIDOCPP_INCLUDE_DIR=../libdigidocpp-install/include ..