diff --git a/docs/Project.toml b/docs/Project.toml
index 82d20fc..3e0dca9 100644
--- a/docs/Project.toml
+++ b/docs/Project.toml
@@ -9,6 +9,7 @@ Unitful = "1986cc42-f94f-5a68-af5c-568840ba703d"
 Zygote = "e88e6eb3-aa80-5325-afca-941959d7151f"
 
 [compat]
+ChainRulesCore = "1.26.1"
 Documenter = "1"
 DocumenterCitations = "1"
 Unitful = "1"
diff --git a/test/Project.toml b/test/Project.toml
index e30e2ba..5f04dc9 100644
--- a/test/Project.toml
+++ b/test/Project.toml
@@ -18,4 +18,5 @@ Unitful = "1986cc42-f94f-5a68-af5c-568840ba703d"
 UnitfulAstro = "6112ee07-acf9-5e0f-b108-d242c714bf9f"
 
 [compat]
+ChainRulesCore = "1.26.1"
 StableRNGs = "1"