diff --git a/.github/workflows/flake-update.yml b/.github/workflows/flake-update.yml
index b4cf625..592693f 100644
--- a/.github/workflows/flake-update.yml
+++ b/.github/workflows/flake-update.yml
@@ -13,16 +13,9 @@ jobs:
       - name: Install Nix
         uses: DeterminateSystems/nix-installer-action@v12
       - name: Update flake lock
-        id: update
-        uses: DeterminateSystems/update-flake-lock@v22
-        with:
-          pr-title: "Update flake.lock" 
-          pr-labels: |
-            dependencies
-            automated
-      - name: merge
-        run: |
-          gh pr merge ${{ steps.update.outputs.pull-request-number }} --squash --delete-branch
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run : |
+          git config --local user.email "github-actions[bot]@users.noreply.github.com"
+          git config --local user.name "github-actions[bot]"
+          nix flake update --commit-lock-file
+          git push origin HEAD:${{ github.ref_name }}
 
diff --git a/modules/shell.nix b/modules/shell.nix
index 80ff471..7903f3b 100644
--- a/modules/shell.nix
+++ b/modules/shell.nix
@@ -64,6 +64,11 @@
       histSize = 10000;
       histFile = "$HOME/.cache/zsh_history";
       interactiveShellInit = ''
+          ### zsh-history-substring-search ###
+          setopt HIST_IGNORE_ALL_DUPS
+          source ${pkgs.zsh-history-substring-search}/share/zsh-history-substring-search/zsh-history-substring-search.zsh
+          bindkey '^[[A' history-substring-search-up
+          bindkey '^[[B' history-substring-search-down
           ### fzf-tab ###
           source ${pkgs.zsh-fzf-tab}/share/fzf-tab/fzf-tab.plugin.zsh
           ### pager ###