diff --git a/CHANGELOG.md b/CHANGELOG.md
index e76b2ada..fcea9cb2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,8 @@ Note: In this file, do not use the hard wrap in the middle of a sentence for com
 
 ## [Unreleased]
 
+- Update `zizmor@latest` to 1.20.0.
+
 ## [2.65.13] - 2026-01-05
 
 - Update `cargo-nextest@latest` to 0.9.118.
diff --git a/manifests/zizmor.json b/manifests/zizmor.json
index 05105282..630c34f0 100644
--- a/manifests/zizmor.json
+++ b/manifests/zizmor.json
@@ -19,10 +19,35 @@
   },
   "license_markdown": "[MIT](https://github.com/zizmorcore/zizmor/blob/main/LICENSE)",
   "latest": {
-    "version": "1.19.0"
+    "version": "1.20.0"
   },
   "1": {
-    "version": "1.19.0"
+    "version": "1.20.0"
+  },
+  "1.20": {
+    "version": "1.20.0"
+  },
+  "1.20.0": {
+    "x86_64_linux_gnu": {
+      "etag": "0x8DE4CBB99505F9F",
+      "checksum": "42fc3dcb9242261309fef0156213c5cb7a7179c1a0693ac8d067cc308f3a55cf"
+    },
+    "x86_64_macos": {
+      "etag": "0x8DE4CBB994BD0E6",
+      "checksum": "a409946504c47587b474e1454eac10e38dc2eb8c144607cb8423afd851758540"
+    },
+    "x86_64_windows": {
+      "etag": "0x8DE4CBB99417C3C",
+      "checksum": "01c11f0e0668ae1a46c015bed9f0ec589440606da928078f6bca87354c9fde2f"
+    },
+    "aarch64_linux_gnu": {
+      "etag": "0x8DE4CBB9931D66C",
+      "checksum": "055abb0d8fdb56be5014226343509ef5b0e8f5481a115d673345718d8dcf616a"
+    },
+    "aarch64_macos": {
+      "etag": "0x8DE4CBB99460AFA",
+      "checksum": "f28ef0570f06e6eb5278a354b314bb314575bb10871efdbd6f49cee74f36e9c5"
+    }
   },
   "1.19": {
     "version": "1.19.0"