diff --git a/pkgs/applications/blockchains/jormungandr/default.nix b/pkgs/applications/blockchains/jormungandr/default.nix
index 541ef49ef5a..0bc766a43bb 100644
--- a/pkgs/applications/blockchains/jormungandr/default.nix
+++ b/pkgs/applications/blockchains/jormungandr/default.nix
@@ -10,12 +10,12 @@
 
 rustPlatform.buildRustPackage rec {
   pname = "jormungandr";
-  version = "0.3.1415";
+  version = "0.3.9999";
 
   src = fetchgit {
     url = "https://github.com/input-output-hk/${pname}";
     rev = "v${version}";
-    sha256 = "1kg20570ri3bj99gicpp2z272igj9s7m2qw0z1ndk60bxcyghi2x";
+    sha256 = "11lr533fpispwbk4vsq9bnv40gkpybvpa7ajwczv9ky6afh8np5b";
     fetchSubmodules = true;
   };