diff --git a/dune-project b/dune-project
index b8b9b31..1d5db23 100644
--- a/dune-project
+++ b/dune-project
@@ -4,4 +4,8 @@
 
 (package
   (name aoc2020)
-  (depends ppx_expect))
+  (depends
+    (re (>= 1.9.0))
+    (ppx_deriving (>= 5.2))
+    (ppx_inline_test (>= v0.14.1))
+    (ppx_expect (>= v0.14.1))))