diff --git a/constraints_tests.txt b/constraints_tests.txt
index 92920cea3..447311d58 100644
--- a/constraints_tests.txt
+++ b/constraints_tests.txt
@@ -8,3 +8,8 @@ GDAL!=3.6.*,!=3.7.*
 
 # https://github.com/natcap/pygeoprocessing/issues/387
 GDAL<3.8.5
+
+# Pyinstaller 6.10 breaks our windows builds.  Until we can figure out the
+# root cause, let's cap the versions to those that work.
+# https://github.com/natcap/invest/issues/1622
+pyinstaller<6.10
diff --git a/exe/invest.spec b/exe/invest.spec
index ac4ec440b..b0f3085ec 100644
--- a/exe/invest.spec
+++ b/exe/invest.spec
@@ -30,7 +30,9 @@ kwargs = {
         'pkg_resources.py2_warn',
         'cmath',
         'charset_normalizer',
-        'scipy.special._cdflib'
+        'scipy.special._cdflib',
+        'scipy.special._special_ufuncs',
+        'scipy._lib.array_api_compat.numpy.fft',
     ],
     'datas': [proj_datas],
     'cipher': block_cipher,