diff --git a/CHANGELOG.md b/CHANGELOG.md
index 92d668e..0a92280 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## Unreleased
+
+- Fetch the pinned Fractal fixture through shallow Git rather than GitHub's commit-tarball endpoint, preserving its source bytes and revision.
+
 ## [0.6.1] - 2026-11-10
 
 ### Added
diff --git a/flake.lock b/flake.lock
index 4c48737..401901c 100644
--- a/flake.lock
+++ b/flake.lock
@@ -44,16 +44,17 @@
       "locked": {
         "lastModified": 1794333982,
         "narHash": "sha256-EYnLgrxDCQXThOybpPxr2okTy7BpcHkzjLvBsaAZ+vM=",
-        "owner": "compoundingtech",
-        "repo": "fractal",
+        "ref": "refs/heads/main",
         "rev": "787e8ed592dff34d2bdc2a2b0b584482da567e7f",
-        "type": "github"
+        "shallow": true,
+        "type": "git",
+        "url": "https://github.com/compoundingtech/fractal"
       },
       "original": {
-        "owner": "compoundingtech",
-        "repo": "fractal",
         "rev": "787e8ed592dff34d2bdc2a2b0b584482da567e7f",
-        "type": "github"
+        "shallow": true,
+        "type": "git",
+        "url": "https://github.com/compoundingtech/fractal"
       }
     },
     "nixpkgs": {
diff --git a/flake.nix b/flake.nix
index e31a469..1fc581c 100644
--- a/flake.nix
+++ b/flake.nix
@@ -7,7 +7,7 @@
   inputs.effect-utils.inputs.nixpkgs.url = "github:NixOS/nixpkgs/4ba99f3209788ed04f01af38f77ddb803ad6ec63";
   inputs.effect-utils.inputs.tsgo.inputs.nixpkgsUnstable.url = "github:NixOS/nixpkgs/44a91898084f46797b5fac650c7e8c9ac38c43d4";
   inputs.fractal-fixture = {
-    url = "github:compoundingtech/fractal/787e8ed592dff34d2bdc2a2b0b584482da567e7f";
+    url = "git+https://github.com/compoundingtech/fractal?rev=787e8ed592dff34d2bdc2a2b0b584482da567e7f&shallow=1";
     flake = false;
   };
   inputs.python-oracle = {