diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index bad5564337367aba0b659ef46456cf37d705571e..380c83ddc0c6142193ccb7521c3e9bf0099a917e 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -126,7 +126,7 @@ stages:
 
 .use_minimum_supported_cmake:
   variables:
-    CMAKE_VERSION: "3.13.5"
+    CMAKE_VERSION: "3.15.5"
 
 .warning_policy:
   allow_failure:
diff --git a/.gitlab/ci/config/cmake.sh b/.gitlab/ci/config/cmake.sh
index 7cfc5a52926d039dbbd021b01c10c814c7f885f6..07d4ac83742e894697086689a8a17bd37a99b3e3 100755
--- a/.gitlab/ci/config/cmake.sh
+++ b/.gitlab/ci/config/cmake.sh
@@ -21,7 +21,7 @@ case "$( uname -s )" in
     Linux)
         readonly -A sumsByVersion=(
             # We require CMake >= 3.13 in the CI to support CUDA builds
-            ['3.13.5']='e2fd0080a6f0fc1ec84647acdcd8e0b4019770f48d83509e6a5b0b6ea27e5864'
+            ['3.15.5']='03cfd669d0f990040ec89bb63a3ae7f6d61fd17c1c4d5e7ec3d1a35fe1f043f0'
             ['3.30.2']='cdd7fb352605cee3ae53b0e18b5929b642900e33d6b0173e19f6d4f2067ebf16'
         )
         shatool="sha256sum"
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 46d1cfc37cb4b529451340f1bc0128e9f2c15e5f..cfa85247d23d25537031a28a845b317979bc09a9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -8,8 +8,7 @@
 ##  PURPOSE.  See the above copyright notice for more information.
 ##============================================================================
 
-# If you want CUDA support, you will need to have CMake 3.13 on Linux/OSX.
-cmake_minimum_required(VERSION 3.12...3.15 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.15 FATAL_ERROR)
 project (VTKm)
 
 # We only allow c++14
diff --git a/README.md b/README.md
index 9b794aeac5089e6da415a139aa3b36f1260d5c22..3aff451a8e63d022bd081d635921535caf54aa3b 100644
--- a/README.md
+++ b/README.md
@@ -74,8 +74,7 @@ VTK-m Requires:
       + MSVC 2015+
       + Intel 17.0.4+
   + [CMake](http://www.cmake.org/download/)
-      + CMake 3.12+
-      + CMake 3.13+ (for CUDA support)
+      + CMake 3.15+
       + CMake 3.24+ (for ROCM+THRUST support)
 
 Optional dependencies are:
diff --git a/vtkm/thirdparty/diy/update.sh b/vtkm/thirdparty/diy/update.sh
index a6fdcf8b3d48bed84ac65908ec34102a4da16dfc..97cc5ad57f0b62de157b81d795d3b230b04db4a8 100755
--- a/vtkm/thirdparty/diy/update.sh
+++ b/vtkm/thirdparty/diy/update.sh
@@ -8,7 +8,7 @@ readonly name="diy"
 readonly ownership="Diy Upstream <kwrobot@kitware.com>"
 readonly subtree="vtkm/thirdparty/$name/vtkm$name"
 readonly repo="https://gitlab.kitware.com/third-party/diy2.git"
-readonly tag="for/vtk-m-20230616-g40ea01f9"
+readonly tag="for/vtk-m-20250321-g40ea01f9"
 readonly paths="
 cmake
 include
diff --git a/vtkm/thirdparty/diy/vtkmdiy/CMakeLists.txt b/vtkm/thirdparty/diy/vtkmdiy/CMakeLists.txt
index 344398ea9dc8b6d5253e27de08e44e588279943b..748372e5ba322591332e5fe2e84303ea8e6921c4 100644
--- a/vtkm/thirdparty/diy/vtkmdiy/CMakeLists.txt
+++ b/vtkm/thirdparty/diy/vtkmdiy/CMakeLists.txt
@@ -13,7 +13,7 @@
 #=============================================================================
 
 project                     (DIY)
-cmake_minimum_required      (VERSION 3.9)
+cmake_minimum_required      (VERSION 3.15)
 
 list (APPEND CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake)