diff --git a/pkgs/by-name/ka/kati/package.nix b/pkgs/by-name/ka/kati/package.nix
index e956e4798851..f3e1e621ff97 100644
--- a/pkgs/by-name/ka/kati/package.nix
+++ b/pkgs/by-name/ka/kati/package.nix
@@ -2,20 +2,25 @@
   lib,
   stdenv,
   fetchFromGitHub,
+  replaceVars,
 }:
 
-stdenv.mkDerivation {
+stdenv.mkDerivation (finalAttrs: {
   pname = "kati-unstable";
-  version = "2019-09-23";
+  version = "0-unstable-2026-02-12";
 
   src = fetchFromGitHub {
     owner = "google";
     repo = "kati";
-    rev = "9da3296746a0cd55b38ebebf91e7f57105a4c36f";
-    sha256 = "0s5dfhgpcbx12b1fqmm8p0jpvrhgrnl9qywv1ksbwhw3pfp7j866";
+    rev = "985493689b70e28970952bde44ac2a8433257b5e";
+    sha256 = "sha256-fn+eA/TBmiyQYeUQvviL/zc9qxUYfW1BaeqNCILsk+w=";
   };
 
-  patches = [ ./version.patch ];
+  patches = [
+    (replaceVars ./version.patch {
+      version = finalAttrs.src.rev;
+    })
+  ];
 
   installPhase = ''
     install -D ckati $out/bin/ckati
@@ -29,4 +34,4 @@ stdenv.mkDerivation {
     license = lib.licenses.asl20;
     maintainers = with lib.maintainers; [ danielfullmer ];
   };
-}
+})
diff --git a/pkgs/by-name/ka/kati/version.patch b/pkgs/by-name/ka/kati/version.patch
index 1821ac6bbb73..fa0c19f2bb8c 100644
--- a/pkgs/by-name/ka/kati/version.patch
+++ b/pkgs/by-name/ka/kati/version.patch
@@ -1,19 +1,22 @@
 diff --git a/Makefile.ckati b/Makefile.ckati
-index e4067bb..15518f3 100644
+index d585106..7e15d08 100644
 --- a/Makefile.ckati
 +++ b/Makefile.ckati
-@@ -102,14 +102,8 @@ $(KATI_CXX_TEST_EXES): $(KATI_BIN_PATH)/%: $(KATI_INTERMEDIATES_PATH)/%.o
+@@ -101,16 +101,8 @@ $(KATI_CXX_TEST_EXES): $(KATI_BIN_PATH)/%: $(KATI_INTERMEDIATES_PATH)/%.o
  	$(KATI_LD) $^ -o $@ $(KATI_LIBS)
  
  # Rule to generate version.cc
--KATI_GIT_DIR := $(shell git -C $(KATI_SRC_PATH) rev-parse --show-toplevel)
+-KATI_GIT_DIR := $(shell cd $(KATI_SRC_PATH); realpath `git rev-parse --git-dir`)
+ KATI_VERSION_DEPS :=
 -ifneq ($(KATI_GIT_DIR),)
--KATI_VERSION_DEPS := $(KATI_GIT_DIR)/.git/HEAD $(KATI_GIT_DIR)/.git/index
+-KATI_VERSION_DEPS := $(wildcard $(KATI_GIT_DIR)/HEAD $(KATI_GIT_DIR)/index)
+-endif
+-ifneq ($(KATI_VERSION_DEPS),)
 -KATI_VERSION := $(shell git -C $(KATI_GIT_DIR) rev-parse HEAD)
 -else
- KATI_VERSION_DEPS :=
- KATI_VERSION := unknown
+-KATI_VERSION := unknown
 -endif
++KATI_VERSION := @version@
  $(KATI_INTERMEDIATES_PATH)/version.cc: $(KATI_VERSION_DEPS)
  	@mkdir -p $(dir $@)
  	echo '// +build ignore' > $@