diff --git a/.github/workflows/c-cpp.yml b/.github/workflows/c-cpp.yml
index 59f581a..adf29a4 100644
--- a/.github/workflows/c-cpp.yml
+++ b/.github/workflows/c-cpp.yml
@@ -8,7 +8,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-20.04, ubuntu-22.04]
+        os: [ubuntu-22.04]
 
     steps:
     - uses: actions/checkout@v3
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 32af9a3..c2ba697 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -30,7 +30,7 @@ endif()
 find_package(QT NAMES Qt5 COMPONENTS Core REQUIRED)
 find_package(
     Qt${QT_VERSION_MAJOR}
-    5.9
+    5.15
     COMPONENTS
     Gui
     Widgets