diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index af3e503..6daebbf 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,7 +14,7 @@ jobs:
     runs-on: ${{ matrix.runs-on }}
     steps:
       - uses: actions/checkout@v4
-      - uses: cachix/install-nix-action@v25
+      - uses: cachix/install-nix-action@v23
       - uses: ./
       - run: actionlint
       - run: shellcheck nix-develop-gha.sh
diff --git a/.github/workflows/new-release.yml b/.github/workflows/new-release.yml
index cef7065..adc2794 100644
--- a/.github/workflows/new-release.yml
+++ b/.github/workflows/new-release.yml
@@ -8,6 +8,6 @@ jobs:
   update-major-tag:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/publish-action@v0.3.0
+      - uses: actions/publish-action@v0.2.2
         with:
           source-tag: ${{ github.event.release.tag_name }}
diff --git a/nix-develop-gha.sh b/nix-develop-gha.sh
index 5d30db8..82d8bf5 100755
--- a/nix-develop-gha.sh
+++ b/nix-develop-gha.sh
@@ -26,7 +26,7 @@ while IFS='=' read -r -d '' n v; do
 		continue
 	fi
 	if (("$(wc -l <<<"$v")" > 1)); then
-		delimiter=BzcqNQnW6x7hfGlLbvCyDlvD
+		delimiter=$(openssl rand -base64 18)
 		if contains "$delimiter" "$v"; then
 			echo "Environment variable $n contains randomly generated string $delimiter, file an issue and buy a lottery ticket."
 			exit 1