diff --git a/CHANGELOG.md b/CHANGELOG.md
index d0dad58..586e911 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [1.3.6] - 2023-01-31
+
+### Fixed
+
+* The the correct environment variable to enable the sparse registry access.
+    The pull request originally had the wrong value, without `CARGO_` prefix.
+
 ## [1.3.5] - 2023-01-21
 
 ### Changed
diff --git a/action.yml b/action.yml
index 45b5ee5..10aa37e 100644
--- a/action.yml
+++ b/action.yml
@@ -67,7 +67,7 @@ runs:
         echo "CARGO_UNSTABLE_SPARSE_REGISTRY=true" >> $GITHUB_ENV
         # Enable sparse index after stabilization
         # https://github.com/rust-lang/cargo/pull/11224
-        echo "REGISTRIES_CRATES_IO_PROTOCOL=sparse" >> $GITHUB_ENV
+        echo "CARGO_REGISTRIES_CRATES_IO_PROTOCOL=sparse" >> $GITHUB_ENV
       shell: bash
     - name: "Install Rust Problem Matcher"
       run: echo "::add-matcher::${{ github.action_path }}/rust.json"