diff --git a/cabal.project b/cabal.project
index 48036e654e..bdbfadba07 100644
--- a/cabal.project
+++ b/cabal.project
@@ -13,7 +13,7 @@ repository cardano-haskell-packages
 -- See CONTRIBUTING for information about these, including some Nix commands
 -- you need to run if you change them
 index-state:
-  , hackage.haskell.org 2023-07-02T00:00:00Z
+  , hackage.haskell.org 2023-07-03T00:00:00Z
   , cardano-haskell-packages 2023-07-06T13:00:00Z
 
 packages:
diff --git a/cardano-api/cardano-api.cabal b/cardano-api/cardano-api.cabal
index 8f0e949f66..76ea4dfa4a 100644
--- a/cardano-api/cardano-api.cabal
+++ b/cardano-api/cardano-api.cabal
@@ -153,7 +153,7 @@ library internal
                       , mtl
                       , network
                       , optparse-applicative-fork
-                      , ouroboros-consensus >= 0.8
+                      , ouroboros-consensus >= 0.9
                       , ouroboros-consensus-cardano >= 0.6
                       , ouroboros-consensus-diffusion >= 0.6
                       , ouroboros-consensus-protocol >= 0.5
diff --git a/flake.lock b/flake.lock
index a038e196e7..1cf917554b 100644
--- a/flake.lock
+++ b/flake.lock
@@ -221,11 +221,11 @@
     "hackage": {
       "flake": false,
       "locked": {
-        "lastModified": 1688516853,
-        "narHash": "sha256-BR7kmt/vblCHJUZyszWV2SDI786HmqBCZCnM37RfFd8=",
+        "lastModified": 1688603318,
+        "narHash": "sha256-rXEPjf6pecyl0mIpK6xk3Vp/lKxWiCUfw6PMU+7utjY=",
         "owner": "input-output-hk",
         "repo": "hackage.nix",
-        "rev": "6aa31b7e500039788e62ee028fbc04d461424c02",
+        "rev": "a5604f20c9446451d4f1fd3ad4c160240069833a",
         "type": "github"
       },
       "original": {