diff --git a/cabal.bootstrap.project b/cabal.bootstrap.project
index efbc4d4258d..cd1213fe347 100644
--- a/cabal.bootstrap.project
+++ b/cabal.bootstrap.project
@@ -9,4 +9,4 @@ packages:
 tests: False
 benchmarks: False
 
-index-state: hackage.haskell.org 2025-04-08T00:00:00Z
+index-state: hackage.haskell.org 2025-06-25T18:35:38Z
diff --git a/cabal.release.project b/cabal.release.project
index 49820909411..2ed8a4acfe5 100644
--- a/cabal.release.project
+++ b/cabal.release.project
@@ -2,7 +2,7 @@ import: project-cabal/pkgs/cabal.config
 import: project-cabal/pkgs/install.config
 import: project-cabal/pkgs/tests.config
 
-index-state: hackage.haskell.org 2024-11-20T00:00:00Z
+index-state: hackage.haskell.org 2025-06-25T18:35:38Z
 
 -- never include this or its TH dependency in a release!
 package cabal-install
diff --git a/cabal.validate.project b/cabal.validate.project
index 5075458c1b8..30b74f827a5 100644
--- a/cabal.validate.project
+++ b/cabal.validate.project
@@ -12,3 +12,7 @@ program-options
 -- to disable this
 package cabal-install
   flags: +git-rev
+
+-- splitmix-0.1.3 is demanding a symbol GitHub's Mac runners don't admit to having
+constraints:
+  splitmix < 0.1.3