diff --git a/Project.toml b/Project.toml
index 725d9a1f7..ddd14436e 100644
--- a/Project.toml
+++ b/Project.toml
@@ -57,7 +57,7 @@ Requires = "1.1"
 SpecialFunctions = "1.6, 2"
 Statistics = "1"
 Tracker = "0.2"
-ZygoteRules = "0.2.5"
+ZygoteRules = "=0.2.5"
 julia = "1.6"
 
 [extras]