diff --git a/pkgs/applications/editors/imhex/default.nix b/pkgs/applications/editors/imhex/default.nix
index 528723878efd..f5d3976232a8 100644
--- a/pkgs/applications/editors/imhex/default.nix
+++ b/pkgs/applications/editors/imhex/default.nix
@@ -22,12 +22,15 @@
 }:
 
 let
-  version = "1.30.1";
+  # FIXME: unstable, stable needs #252945 (details in #258964)
+  # Next version bump should be stabilized
+  version = "unstable-2023-10-01";
+  patterns_version = "1.31.0";
 
   patterns_src = fetchFromGitHub {
     owner = "WerWolv";
     repo = "ImHex-Patterns";
-    rev = "ImHex-v${version}";
+    rev = "ImHex-v${patterns_version}";
     hash = "sha256-lTTXu9RxoD582lXWI789gNcWvJmxmBIlBRIiyY3DseM=";
   };
 
@@ -40,8 +43,8 @@ stdenv.mkDerivation rec {
     fetchSubmodules = true;
     owner = "WerWolv";
     repo = pname;
-    rev = "v${version}";
-    hash = "sha256-3s9Dgdhl+k2KjMoSHNl59YOoCEwqK+37DOzKdGP88/4=";
+    rev = "a62ede784018f9d5aaf40587f71a1271429ab50b";
+    hash = "sha256-lIk8oPEkkkkkkkkkkkkuh2hIx/Qg1kf9tTFvH3gX8XA=";
   };
 
   nativeBuildInputs = [ cmake llvm python3 perl pkg-config rsync ];