diff --git a/flake.lock b/flake.lock
index facd63ca65..67dc542bbc 100644
--- a/flake.lock
+++ b/flake.lock
@@ -65,16 +65,16 @@
         "z3": "z3"
       },
       "locked": {
-        "lastModified": 1729168859,
-        "narHash": "sha256-S9Vx0p6kDorS9NwnZb+QOTGpMKXwGlchCiiow881nTs=",
+        "lastModified": 1729239262,
+        "narHash": "sha256-yKZaer1Nt+cRNO8uKtxZtDOlfh80sMphlKNe0Ar+bs0=",
         "owner": "runtimeverification",
         "repo": "haskell-backend",
-        "rev": "712543ed61f5ca4365b84d0f7ef6d71a35349662",
+        "rev": "286b525b7aa81e3bc3c92b90ebc368dc13401f99",
         "type": "github"
       },
       "original": {
         "owner": "runtimeverification",
-        "ref": "v0.1.90",
+        "ref": "v0.1.91",
         "repo": "haskell-backend",
         "type": "github"
       }