diff --git a/install-prereqs.sh b/install-prereqs.sh
index d44c388..99986d4 100755
--- a/install-prereqs.sh
+++ b/install-prereqs.sh
@@ -75,8 +75,8 @@
     pv
     python-is-python3
     python3-protobuf
-    python3
-    python3-dev
+    python3.9
+    python3.9-dev
     python3-pip
     rsync
     srecord