diff --git a/Dockerfile b/Dockerfile
index c83ecb78..6f9b4b9c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -27,8 +27,8 @@ RUN apt-get update && \
 
 # Ubuntu 24's version of CMake is 3.28. We need a newer version.
 RUN apt-get remove --purge --auto-remove cmake
-RUN wget -q https://github.com/Kitware/CMake/releases/download/v3.31.7/cmake-3.31.7-linux-x86_64.sh && \
-    sh cmake-3.31.7-linux-x86_64.sh --prefix=/usr/local --skip-license
+RUN wget -q https://github.com/Kitware/CMake/releases/download/v3.28.1/cmake-3.28.1-linux-x86_64.sh && \
+    sh cmake-3.28.1-linux-x86_64.sh --prefix=/usr/local --skip-license
 
 # Copy relevant files for simulation.
 COPY ./Makefile /qsim/Makefile
diff --git a/dev-requirements.txt b/dev-requirements.txt
index e6999aae..6402543e 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -1,5 +1,5 @@
+cmake~=3.28.1
 black~=25.9.0
-cmake~=3.31.0
 flynt~=1.0
 pytest
 pytest-xdist
diff --git a/install/tests/Dockerfile b/install/tests/Dockerfile
index b3e51020..e8ffe6cb 100644
--- a/install/tests/Dockerfile
+++ b/install/tests/Dockerfile
@@ -27,8 +27,8 @@ RUN apt-get update && \
 
 # Ubuntu 24's version of CMake is 3.28. We need a newer version.
 RUN apt-get remove --purge --auto-remove cmake
-RUN wget -q https://github.com/Kitware/CMake/releases/download/v3.31.7/cmake-3.31.7-linux-x86_64.sh && \
-    sh cmake-3.31.7-linux-x86_64.sh --prefix=/usr/local --skip-license
+RUN wget -q https://github.com/Kitware/CMake/releases/download/v3.28.1/cmake-3.28.1-linux-x86_64.sh && \
+    sh cmake-3.28.1-linux-x86_64.sh --prefix=/usr/local --skip-license
 
 # Copy qsim files from the outside-Docker location to an inside-Docker location.
 COPY ./ /qsim/
diff --git a/setup.py b/setup.py
index 2ad08845..74976b03 100644
--- a/setup.py
+++ b/setup.py
@@ -47,8 +47,8 @@ def run(self):
             cmake_version = parse(
                 re.search(r"version\s*([\d.]+)", out.decode()).group(1)
             )
-            if cmake_version < parse("3.31.0"):
-                raise RuntimeError("CMake >= 3.31.0 is required on Windows")
+            if cmake_version < parse("3.28.0"):
+                raise RuntimeError("CMake >= 3.28.0 is required on Windows")
 
         for ext in self.extensions:
             self.build_extension(ext)
@@ -151,7 +151,7 @@ def build_extension(self, ext):
         "packaging",
         "setuptools>=75.2.0",
         "pybind11[global]",
-        "cmake~=3.31.0",
+        "cmake~=3.28.1",
     ],
     extras_require={
         "dev": dev_requirements,