diff --git a/nixos/modules/services/monitoring/prometheus/blackbox-exporter.nix b/nixos/modules/services/monitoring/prometheus/blackbox-exporter.nix
index 388e4d4ac01..ce2e1cf2d74 100644
--- a/nixos/modules/services/monitoring/prometheus/blackbox-exporter.nix
+++ b/nixos/modules/services/monitoring/prometheus/blackbox-exporter.nix
@@ -57,8 +57,8 @@ in {
         AmbientCapabilities = [ "CAP_NET_RAW" ]; # for ping probes
         ExecStart = ''
           ${pkgs.prometheus-blackbox-exporter}/bin/blackbox_exporter \
-            -web.listen-address :${toString cfg.port} \
-            -config.file ${cfg.configFile} \
+            --web.listen-address :${toString cfg.port} \
+            --config.file ${cfg.configFile} \
             ${concatStringsSep " \\\n  " cfg.extraFlags}
         '';
         ExecReload = "${pkgs.coreutils}/bin/kill -HUP $MAINPID";
diff --git a/pkgs/servers/monitoring/prometheus/blackbox-exporter.nix b/pkgs/servers/monitoring/prometheus/blackbox-exporter.nix
index ccbcce26033..27e6dea01ec 100644
--- a/pkgs/servers/monitoring/prometheus/blackbox-exporter.nix
+++ b/pkgs/servers/monitoring/prometheus/blackbox-exporter.nix
@@ -2,7 +2,7 @@
 
 buildGoPackage rec {
   name = "blackbox_exporter-${version}";
-  version = "0.5.0";
+  version = "0.8.1";
   rev = version;
 
   goPackagePath = "github.com/prometheus/blackbox_exporter";
@@ -11,7 +11,7 @@ buildGoPackage rec {
     rev = "v${version}";
     owner = "prometheus";
     repo = "blackbox_exporter";
-    sha256 = "1q719q7xslksj9m5c5d8jmap9380nsrdc71yjyn70rimv8xmzfj1";
+    sha256 = "1bnn1xa11593m66ihdnyka0ck8zmg4abvwdyy5fpnyx29g3ym4sd";
   };
 
   meta = with stdenv.lib; {