diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index fff71d40..4a1c2c3d 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -30,7 +30,7 @@ jobs:
     - name: Setup cmake
       uses: jwlawson/actions-setup-cmake@802fa1a2c4e212495c05bf94dba2704a92a472be # v2.0.2
       with:
-        cmake-version: 3.13.5
+        cmake-version: 3.20.6
 
     - name: Setup ninja
       uses: ashutoshvarma/setup-ninja@66ad2db9ed7d211c065daeeb849e9c8c895773c9 # master
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7bdb4ff4..35a44d22 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.13.5)
+cmake_minimum_required(VERSION 3.20.6)
 
 set(PYTHON_VERSION "3.9.22" CACHE STRING "The version of Python to build.")
 
@@ -113,7 +113,7 @@ cmake_dependent_option(USE_SYSTEM_ZLIB "Use system ZLIB" ${_use_system_zlib_defa
 cmake_dependent_option(USE_SYSTEM_GDBM "Use system GDBM" ON "USE_SYSTEM_LIBRARIES" OFF)
 cmake_dependent_option(USE_SYSTEM_READLINE "Use system READLINE" ON "USE_SYSTEM_LIBRARIES" OFF)
 cmake_dependent_option(USE_SYSTEM_SQLite3 "Use system SQLITE3" ON "USE_SYSTEM_LIBRARIES" OFF)
-  cmake_dependent_option(USE_SYSTEM_LIBMPDEC "Use system LIBMPDEC" ON "USE_SYSTEM_LIBRARIES" OFF)
+cmake_dependent_option(USE_SYSTEM_LIBMPDEC "Use system LIBMPDEC" OFF "USE_SYSTEM_LIBRARIES" OFF)
 
 cmake_dependent_option(USE_BUILTIN_ZLIB "Use builtin ZLIB" ${_use_builtin_zlib_default} "NOT USE_SYSTEM_ZLIB" OFF)
 
diff --git a/cmake/ConfigureChecks.cmake b/cmake/ConfigureChecks.cmake
index ce0efc62..6e55bda6 100644
--- a/cmake/ConfigureChecks.cmake
+++ b/cmake/ConfigureChecks.cmake
@@ -165,12 +165,7 @@ if(DEFINED SQLITE3_LIBRARY)
     set(SQLite3_LIBRARY ${SQLITE3_LIBRARY})
 endif()
 if(USE_SYSTEM_SQLite3)
-    if(CMAKE_VERSION VERSION_GREATER_EQUAL "3.14")
     find_package(SQLite3) # https://cmake.org/cmake/help/latest/module/FindSQLite3.html
-    else()
-    find_path(SQLite3_INCLUDE_DIR sqlite3.h)
-    find_library(SQLite3_LIBRARY sqlite3)
-    endif()
 endif()
 set(SQLite3_INCLUDE_DIRS ${SQLite3_INCLUDE_DIR})
 set(SQLite3_LIBRARIES ${SQLite3_LIBRARY})