diff --git a/infra/config/recipes.cfg b/infra/config/recipes.cfg
index e717b9c96..6a79bbaeb 100644
--- a/infra/config/recipes.cfg
+++ b/infra/config/recipes.cfg
@@ -17,7 +17,7 @@
   "deps": {
     "recipe_engine": {
       "branch": "refs/heads/main",
-      "revision": "eb434718b27659fb36792b710cf2b80b8d85aa0b",
+      "revision": "c406446548974dc887dac0a676838e08e09b526a",
       "url": "https://chromium.googlesource.com/infra/luci/recipes-py.git"
     }
   },
diff --git a/recipes/README.recipes.md b/recipes/README.recipes.md
index 28f5c218a..a99a82938 100644
--- a/recipes/README.recipes.md
+++ b/recipes/README.recipes.md
@@ -1212,26 +1212,26 @@ Move things around in a loop!
 
 — **def [RunSteps](/recipes/recipe_modules/windows_sdk/examples/full.py#16)(api):**
 
-[recipe_engine/recipe_modules/archive]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/eb434718b27659fb36792b710cf2b80b8d85aa0b/README.recipes.md#recipe_modules-archive
-[recipe_engine/recipe_modules/assertions]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/eb434718b27659fb36792b710cf2b80b8d85aa0b/README.recipes.md#recipe_modules-assertions
-[recipe_engine/recipe_modules/buildbucket]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/eb434718b27659fb36792b710cf2b80b8d85aa0b/README.recipes.md#recipe_modules-buildbucket
-[recipe_engine/recipe_modules/cipd]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/eb434718b27659fb36792b710cf2b80b8d85aa0b/README.recipes.md#recipe_modules-cipd
-[recipe_engine/recipe_modules/commit_position]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/eb434718b27659fb36792b710cf2b80b8d85aa0b/README.recipes.md#recipe_modules-commit_position
-[recipe_engine/recipe_modules/context]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/eb434718b27659fb36792b710cf2b80b8d85aa0b/README.recipes.md#recipe_modules-context
-[recipe_engine/recipe_modules/cq]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/eb434718b27659fb36792b710cf2b80b8d85aa0b/README.recipes.md#recipe_modules-cq
-[recipe_engine/recipe_modules/cv]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/eb434718b27659fb36792b710cf2b80b8d85aa0b/README.recipes.md#recipe_modules-cv
-[recipe_engine/recipe_modules/file]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/eb434718b27659fb36792b710cf2b80b8d85aa0b/README.recipes.md#recipe_modules-file
-[recipe_engine/recipe_modules/json]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/eb434718b27659fb36792b710cf2b80b8d85aa0b/README.recipes.md#recipe_modules-json
-[recipe_engine/recipe_modules/led]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/eb434718b27659fb36792b710cf2b80b8d85aa0b/README.recipes.md#recipe_modules-led
-[recipe_engine/recipe_modules/milo]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/eb434718b27659fb36792b710cf2b80b8d85aa0b/README.recipes.md#recipe_modules-milo
-[recipe_engine/recipe_modules/path]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/eb434718b27659fb36792b710cf2b80b8d85aa0b/README.recipes.md#recipe_modules-path
-[recipe_engine/recipe_modules/platform]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/eb434718b27659fb36792b710cf2b80b8d85aa0b/README.recipes.md#recipe_modules-platform
-[recipe_engine/recipe_modules/properties]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/eb434718b27659fb36792b710cf2b80b8d85aa0b/README.recipes.md#recipe_modules-properties
-[recipe_engine/recipe_modules/raw_io]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/eb434718b27659fb36792b710cf2b80b8d85aa0b/README.recipes.md#recipe_modules-raw_io
-[recipe_engine/recipe_modules/resultdb]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/eb434718b27659fb36792b710cf2b80b8d85aa0b/README.recipes.md#recipe_modules-resultdb
-[recipe_engine/recipe_modules/runtime]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/eb434718b27659fb36792b710cf2b80b8d85aa0b/README.recipes.md#recipe_modules-runtime
-[recipe_engine/recipe_modules/step]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/eb434718b27659fb36792b710cf2b80b8d85aa0b/README.recipes.md#recipe_modules-step
-[recipe_engine/recipe_modules/time]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/eb434718b27659fb36792b710cf2b80b8d85aa0b/README.recipes.md#recipe_modules-time
-[recipe_engine/recipe_modules/url]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/eb434718b27659fb36792b710cf2b80b8d85aa0b/README.recipes.md#recipe_modules-url
-[recipe_engine/recipe_modules/version]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/eb434718b27659fb36792b710cf2b80b8d85aa0b/README.recipes.md#recipe_modules-version
-[recipe_engine/wkt/RecipeApi]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/eb434718b27659fb36792b710cf2b80b8d85aa0b/recipe_engine/recipe_api.py#433
+[recipe_engine/recipe_modules/archive]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/c406446548974dc887dac0a676838e08e09b526a/README.recipes.md#recipe_modules-archive
+[recipe_engine/recipe_modules/assertions]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/c406446548974dc887dac0a676838e08e09b526a/README.recipes.md#recipe_modules-assertions
+[recipe_engine/recipe_modules/buildbucket]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/c406446548974dc887dac0a676838e08e09b526a/README.recipes.md#recipe_modules-buildbucket
+[recipe_engine/recipe_modules/cipd]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/c406446548974dc887dac0a676838e08e09b526a/README.recipes.md#recipe_modules-cipd
+[recipe_engine/recipe_modules/commit_position]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/c406446548974dc887dac0a676838e08e09b526a/README.recipes.md#recipe_modules-commit_position
+[recipe_engine/recipe_modules/context]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/c406446548974dc887dac0a676838e08e09b526a/README.recipes.md#recipe_modules-context
+[recipe_engine/recipe_modules/cq]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/c406446548974dc887dac0a676838e08e09b526a/README.recipes.md#recipe_modules-cq
+[recipe_engine/recipe_modules/cv]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/c406446548974dc887dac0a676838e08e09b526a/README.recipes.md#recipe_modules-cv
+[recipe_engine/recipe_modules/file]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/c406446548974dc887dac0a676838e08e09b526a/README.recipes.md#recipe_modules-file
+[recipe_engine/recipe_modules/json]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/c406446548974dc887dac0a676838e08e09b526a/README.recipes.md#recipe_modules-json
+[recipe_engine/recipe_modules/led]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/c406446548974dc887dac0a676838e08e09b526a/README.recipes.md#recipe_modules-led
+[recipe_engine/recipe_modules/milo]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/c406446548974dc887dac0a676838e08e09b526a/README.recipes.md#recipe_modules-milo
+[recipe_engine/recipe_modules/path]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/c406446548974dc887dac0a676838e08e09b526a/README.recipes.md#recipe_modules-path
+[recipe_engine/recipe_modules/platform]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/c406446548974dc887dac0a676838e08e09b526a/README.recipes.md#recipe_modules-platform
+[recipe_engine/recipe_modules/properties]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/c406446548974dc887dac0a676838e08e09b526a/README.recipes.md#recipe_modules-properties
+[recipe_engine/recipe_modules/raw_io]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/c406446548974dc887dac0a676838e08e09b526a/README.recipes.md#recipe_modules-raw_io
+[recipe_engine/recipe_modules/resultdb]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/c406446548974dc887dac0a676838e08e09b526a/README.recipes.md#recipe_modules-resultdb
+[recipe_engine/recipe_modules/runtime]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/c406446548974dc887dac0a676838e08e09b526a/README.recipes.md#recipe_modules-runtime
+[recipe_engine/recipe_modules/step]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/c406446548974dc887dac0a676838e08e09b526a/README.recipes.md#recipe_modules-step
+[recipe_engine/recipe_modules/time]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/c406446548974dc887dac0a676838e08e09b526a/README.recipes.md#recipe_modules-time
+[recipe_engine/recipe_modules/url]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/c406446548974dc887dac0a676838e08e09b526a/README.recipes.md#recipe_modules-url
+[recipe_engine/recipe_modules/version]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/c406446548974dc887dac0a676838e08e09b526a/README.recipes.md#recipe_modules-version
+[recipe_engine/wkt/RecipeApi]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/c406446548974dc887dac0a676838e08e09b526a/recipe_engine/recipe_api.py#433
diff --git a/recipes/recipes.py b/recipes/recipes.py
index 05ca94164..c6ef83add 100755
--- a/recipes/recipes.py
+++ b/recipes/recipes.py
@@ -235,13 +235,10 @@ def main():
   if not shutil.which(vpython):
     return f'Required binary is not found on PATH: {vpython}'
 
-  # We unset PYTHONPATH here in case the user has conflicting environmental
-  # things we don't want them to leak through into the recipe_engine which
-  # manages its environment entirely via vpython.
-  #
-  # NOTE: os.unsetenv unhelpfully doesn't exist on all platforms until python3.9
-  # so we have to use the cutesy `pop` formulation below until then...
-  os.environ.pop("PYTHONPATH", None)
+  # We overwrite PYTHONPATH here on purpose; We don't want any conflicting
+  # environmental path leaking through into the recipe_engine which manages its
+  # environment entirely via vpython.
+  os.environ['PYTHONPATH'] = engine_path
 
   spec = '.vpython3'
   debugger = os.environ.get('RECIPE_DEBUGGER', '')