diff --git a/requirements.txt b/requirements.txt
index c744b06b6..2e0db9d95 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,4 +11,3 @@ packaging == 16.8
 roman == 2.0.0
 beautifulsoup4 == 4.6.0
 pyyaml >= 5.1
-PyInstaller >= 3.6
diff --git a/scripts/setup-osx.sh b/scripts/setup-osx.sh
index 06b303bc4..f9c303412 100644
--- a/scripts/setup-osx.sh
+++ b/scripts/setup-osx.sh
@@ -5,3 +5,4 @@ sudo python3 -m ensurepip --upgrade
 # A manual check that the correct version of Python is running.
 python3 --version
 python3 -m pip install -r requirements.txt
+python3 -m pip install PyInstaller