diff --git a/Makefile b/Makefile
index ca4ac9605..095ee112f 100644
--- a/Makefile
+++ b/Makefile
@@ -14,7 +14,7 @@ RAPIDJSON_VERSION := 1.1.0
 STAN_VERSION := 2.26.1
 STANC_VERSION := 2.26.1
 MATH_VERSION := 4.0.1
-BOOST_VERSION := 1.75.0
+BOOST_VERSION := 1.72.0
 EIGEN_VERSION := 3.3.9
 SUNDIALS_VERSION := 5.6.1
 TBB_VERSION := 2019_U8
diff --git a/httpstan/models.py b/httpstan/models.py
index bd859b4b5..dca98603f 100644
--- a/httpstan/models.py
+++ b/httpstan/models.py
@@ -130,7 +130,7 @@ async def build_services_extension_module(program_code: str, extra_compile_args:
         model_directory_path.as_posix(),
         os.path.join(httpstan_dir, "include"),
         os.path.join(httpstan_dir, "include", "lib", "eigen_3.3.9"),
-        os.path.join(httpstan_dir, "include", "lib", "boost_1.75.0"),
+        os.path.join(httpstan_dir, "include", "lib", "boost_1.72.0"),
         os.path.join(httpstan_dir, "include", "lib", "sundials_5.6.1", "include"),
         os.path.join(httpstan_dir, "include", "lib", "tbb_2019_U8", "include"),
     ]