diff --git a/hosts/del/configuration.nix b/hosts/del/configuration.nix
index 33a9a6a7..18cd3c50 100644
--- a/hosts/del/configuration.nix
+++ b/hosts/del/configuration.nix
@@ -141,7 +141,7 @@
                 enable = true;
                 userName = "jacekpoz";
                 userEmail = "jacekpoz@cock.li";
-                signingKey = "0EEE6B0C9A8CC06820E59C3894E812A8B12AAE3C";
+                signingKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIHXD1EM4mQz99vJhmZX1r7kwMd8yewogOuoTUuv1xWZB";
                 defaultBranch = "master";
             };
             starship.enable = true;
diff --git a/hosts/niks/configuration.nix b/hosts/niks/configuration.nix
index 76bae6a0..85ffd704 100644
--- a/hosts/niks/configuration.nix
+++ b/hosts/niks/configuration.nix
@@ -112,7 +112,7 @@
                 enable = true;
                 userName = "jacekpoz";
                 userEmail = "jacekpoz@cock.li";
-                signingKey = "0EEE6B0C9A8CC06820E59C3894E812A8B12AAE3C";
+                signingKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIHXD1EM4mQz99vJhmZX1r7kwMd8yewogOuoTUuv1xWZB";
                 defaultBranch = "master";
             };
             starship.enable = true;
diff --git a/modules/cli/git.nix b/modules/cli/git.nix
index d462896f..5a03996b 100644
--- a/modules/cli/git.nix
+++ b/modules/cli/git.nix
@@ -49,7 +49,7 @@ in {
                         gpgsign = true;
                     };
                     gpg.format = "ssh";
-                    user.signingkey = "key::ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIHXD1EM4mQz99vJhmZX1r7kwMd8yewogOuoTUuv1xWZB";
+                    user.signingkey = "key::${cfg.signingKey}";
                     merge.conflictstyle = "zdiff3";
                     interactive.diffFilter = "${pkgs.delta}/bin/delta --color-only";
                     diff.algorithm = "histogram";