diff --git a/Project.toml b/Project.toml
index 58314584..d3811cc3 100644
--- a/Project.toml
+++ b/Project.toml
@@ -33,6 +33,7 @@ ImplicitAD = "0.3"
 IterativeSolvers = "0.9"
 LineSearches = "7"
 NLsolve = "4"
+Primes = "0.5"
 QuadGK = "2"
 SimpleNonlinearSolve = "1"
 SpecialFunctions = "2"