diff --git a/pkgs/tools/misc/html-proofer/Gemfile.lock b/pkgs/tools/misc/html-proofer/Gemfile.lock
index be01c0118b3de1..08689ae8dcf701 100644
--- a/pkgs/tools/misc/html-proofer/Gemfile.lock
+++ b/pkgs/tools/misc/html-proofer/Gemfile.lock
@@ -6,7 +6,7 @@ GEM
     ethon (0.12.0)
       ffi (>= 1.3.0)
     ffi (1.11.1)
-    html-proofer (3.12.2)
+    html-proofer (3.13.0)
       addressable (~> 2.3)
       mercenary (~> 0.3)
       nokogiri (~> 1.10)
diff --git a/pkgs/tools/misc/html-proofer/gemset.nix b/pkgs/tools/misc/html-proofer/gemset.nix
index 2deda655d995db..2d915a48dd93e9 100644
--- a/pkgs/tools/misc/html-proofer/gemset.nix
+++ b/pkgs/tools/misc/html-proofer/gemset.nix
@@ -37,10 +37,10 @@
     platforms = [];
     source = {
       remotes = ["https://rubygems.org"];
-      sha256 = "0xkcchgvlqkk3xgn11vw8n42bhavj6nn6vqsbycbx1rqxgiljlhy";
+      sha256 = "1a620704y2h4g9ffpl6461ssdx87bn6hjd0y1m370r2p2xddkb9f";
       type = "gem";
     };
-    version = "3.12.2";
+    version = "3.13.0";
   };
   mercenary = {
     groups = ["default"];