diff --git a/.appveyor.yml b/.appveyor.yml
index 5d28a9f51..f5a1a70c0 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -1,10 +1,10 @@
-image: Visual Studio 2017
+image: Visual Studio 2019
 
 environment:
   DEPLOY_DIR: Spectral-%APPVEYOR_BUILD_VERSION%
   matrix:
-  - QTDIR: C:\Qt\5.12\msvc2017_64
-    VCVARS: "C:\\Program Files (x86)\\Microsoft Visual Studio\\2017\\Community\\VC\\Auxiliary\\Build\\vcvars64.bat"
+  - QTDIR: C:\Qt\5.15\msvc2019_64
+    VCVARS: "C:\\Program Files (x86)\\Microsoft Visual Studio\\2019\\Community\\VC\\Auxiliary\\Build\\vcvars64.bat"
     PLATFORM:
 
 init:
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 9637c84f3..6759aab3b 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -19,7 +19,7 @@ build-appimage:
     - sudo cmake --build build --target install
     - cd ..
     - git clone https://github.com/commonmark/cmark.git && cd cmark
-    - git checkout tags/0.29.0
+    - git reset --hard tags/0.29.0
     - cmake . -Bbuild -LA -DCMAKE_BUILD_TYPE=RelWithDebInfo -DCMAKE_INSTALL_PREFIX=install -DCMARK_SHARED=ON -DCMARK_STATIC=ON -DCMARK_TESTS=OFF
     - cmake --build build --target install --parallel $(nproc)
     - cd ..