diff --git a/requirements.txt b/requirements.txt
index 6718fe1bf..2e1a355a6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,7 +3,8 @@ Babel>=1.3,<3.0
 Flask-Babel>=0.11.1,<4.1.0
 Flask-Principal>=0.3.2,<0.5.1
 Flask>=1.0.2,<3.1.0
-iso-639>=0.4.5,<0.5.0
+iso-639>=0.4.5,<0.5.0;python_version<"3.12"
+pycountry>=20.0.0,<25.0.0;python_version>="3.12"
 PyPDF>=3.15.6,<5.1.0
 pytz>=2016.10
 requests>=2.32.0,<2.33.0