diff --git a/.github/workflows/ubuntu20.yml b/.github/workflows/ubuntu20.yml
index 8b90b09..aba35c4 100644
--- a/.github/workflows/ubuntu20.yml
+++ b/.github/workflows/ubuntu20.yml
@@ -10,7 +10,7 @@ jobs:
       - name: Setup cmake
         uses: jwlawson/actions-setup-cmake@v1.13
         with:
-          cmake-version: '3.9.x'
+          cmake-version: '3.11.x'
       - name: Use cmake
         run: |
           mkdir build &&
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 543184e..f43e13a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.9)
+cmake_minimum_required(VERSION 3.11)
 cmake_policy(SET CMP0048 NEW)
 
 project(fast_double_parser LANGUAGES CXX VERSION 0.0.0.0)