diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 583ff66..04ec410 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -45,7 +45,7 @@ jobs:
           graphviz
 
         # Minimum supported CMake version testing
-        curl -L "https://github.com/Kitware/CMake/releases/download/v3.15.0/cmake-3.15.0-Linux-$(uname -m).sh" -o /tmp/cmake-install.sh
+        curl -L "https://github.com/Kitware/CMake/releases/download/v3.18.0/cmake-3.18.0-Linux-$(uname -m).sh" -o /tmp/cmake-install.sh
         mkdir -p "${HOME}/.local"
         bash /tmp/cmake-install.sh --skip-license --exclude-subdir "--prefix=${HOME}/.local"
 
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 10ebd6b..4474d0c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -6,7 +6,7 @@
 # the LICENSE file found in the root directory of this source tree.
 #
 
-cmake_minimum_required(VERSION 3.15)
+cmake_minimum_required(VERSION 3.18)
 
 # Sets "library_root" variable for decompiler cpp root directory
 # Sets "ghidra_version" for numeric version number
diff --git a/README.md b/README.md
index 3cc2bf5..0eb1d54 100644
--- a/README.md
+++ b/README.md
@@ -19,7 +19,7 @@ This repository provides a CMake-based build project for SLEIGH so that it can b
 | Name | Version | Linux Package to Install | macOS Homebrew Package to Install |
 | ---- | ------- | ------------------------ | --------------------------------- |
 | [Git](https://git-scm.com/) | Latest | git | N/A |
-| [CMake](https://cmake.org/) | 3.21+ | cmake | cmake |
+| [CMake](https://cmake.org/) | 3.18+ | cmake | cmake |
 
 **NOTE**: This CMake project pulls the Ghidra source code from the internet during configuration. See the [note on Ghidra source code section](#note-on-ghidra-source-code) for more details.
 
diff --git a/cmake/modules/sleighCompile.cmake b/cmake/modules/sleighCompile.cmake
index 09790de..15f2e55 100644
--- a/cmake/modules/sleighCompile.cmake
+++ b/cmake/modules/sleighCompile.cmake
@@ -6,7 +6,7 @@
 # the LICENSE file found in the root directory of this source tree.
 #
 
-cmake_minimum_required(VERSION 3.15)
+cmake_minimum_required(VERSION 3.18)
 
 # Takes the following required arguments:
 #