diff --git a/pkgs/by-name/su/surelog/package.nix b/pkgs/by-name/su/surelog/package.nix
index 0d795611b95a..baec8a830466 100644
--- a/pkgs/by-name/su/surelog/package.nix
+++ b/pkgs/by-name/su/surelog/package.nix
@@ -16,13 +16,14 @@
 
 stdenv.mkDerivation (finalAttrs: {
   pname = "surelog";
-  version = "1.83";
+  version = "1.84-unstable-2024-11-09";
 
   src = fetchFromGitHub {
     owner = "chipsalliance";
     repo = "surelog";
-    rev = "v${finalAttrs.version}";
-    hash = "sha256-V4LmW4ca6KfugOu0XnGwutRqWR/9K6ESokHOB2yAVag=";
+    # Once we're back on a stable tag, use "v$(finalAttrs.version}" below.
+    rev = "da88163a02dbc16f1af3514f281b93941d371ad9";
+    hash = "sha256-TIwXIMcDImZjCIiXwvT2MhukArgrWCgOf2AOvkG/55g=";
     fetchSubmodules = false;  # we use all dependencies from nix
   };
 
@@ -69,7 +70,7 @@ stdenv.mkDerivation (finalAttrs: {
     homepage = "https://github.com/chipsalliance/Surelog";
     license = lib.licenses.asl20;
     mainProgram = "surelog";
-    maintainers = with lib.maintainers; [ matthuszagh ];
+    maintainers = with lib.maintainers; [ matthuszagh hzeller ];
     platforms = lib.platforms.all;
   };
 })
diff --git a/pkgs/by-name/uh/uhdm/package.nix b/pkgs/by-name/uh/uhdm/package.nix
index 72b55ffbcd7a..0b647eaafc21 100644
--- a/pkgs/by-name/uh/uhdm/package.nix
+++ b/pkgs/by-name/uh/uhdm/package.nix
@@ -10,13 +10,14 @@
 stdenv.mkDerivation (finalAttrs: {
   pname = "UHDM";
   # When updating this package, also consider updating science/logic/surelog
-  version = "1.83";
+  version = "1.84-unstable-2024-10-06";
 
   src = fetchFromGitHub {
     owner = "chipsalliance";
     repo = "UHDM";
-    rev = "v${finalAttrs.version}";
-    hash = "sha256-va8qAzsg589C6rLmG1uIMDr4X30qpBgRO1ZVKdEs5ok=";
+    # After we're back on a stable tag, use v${finalAttrs.version}
+    rev = "857f68de3ce5b6f919f3a0f489c93072751b1578";
+    hash = "sha256-qHcRncsvMiSJji+JLOlfQ87+pfKg+zvlqMTXKpImvTM=";
     fetchSubmodules = false;  # we use all dependencies from nix
   };
 
@@ -42,7 +43,7 @@ stdenv.mkDerivation (finalAttrs: {
     description = "Universal Hardware Data Model";
     homepage = "https://github.com/chipsalliance/UHDM";
     license = lib.licenses.asl20;
-    maintainers = with lib.maintainers; [ matthuszagh ];
+    maintainers = with lib.maintainers; [ matthuszagh hzeller ];
     platforms = lib.platforms.all;
   };
 })