diff --git a/tahoe-capabilities.cabal b/tahoe-capabilities.cabal
index 7af4ce996db837f9c34c694b74752d9ae73e9edc..ba98a6cb01cb9ef32f8ce2c1ff0488a17b020486 100644
--- a/tahoe-capabilities.cabal
+++ b/tahoe-capabilities.cabal
@@ -1,4 +1,4 @@
-cabal-version:   3.0
+cabal-version:   2.4
 
 -- The cabal-version field refers to the version of the .cabal specification,
 -- and can be different from the cabal-install (the tool) version and the