diff --git a/tools/constraints.txt b/tools/constraints.txt
index 7a539ac95..50413612e 100644
--- a/tools/constraints.txt
+++ b/tools/constraints.txt
@@ -4,3 +4,5 @@
 # Add any upper bounds for packages here to ensure that
 # their builds succeed, or those for packages that rely
 # on them at build time.
+
+maturin<1.8