diff --git a/pkgs/tools/misc/html-proofer/Gemfile.lock b/pkgs/tools/misc/html-proofer/Gemfile.lock
index c3ff0fd210fe..0ba32818d21b 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 (1.12.2)
-    html-proofer (3.15.2)
+    html-proofer (3.15.3)
       addressable (~> 2.3)
       mercenary (~> 0.3)
       nokogumbo (~> 2.0)
@@ -21,7 +21,7 @@ GEM
     nokogumbo (2.0.2)
       nokogiri (~> 1.8, >= 1.8.4)
     parallel (1.19.1)
-    public_suffix (4.0.3)
+    public_suffix (4.0.4)
     rainbow (3.0.0)
     typhoeus (1.3.1)
       ethon (>= 0.9.0)
diff --git a/pkgs/tools/misc/html-proofer/gemset.nix b/pkgs/tools/misc/html-proofer/gemset.nix
index 2e3b3a10b3b8..c5836bc74ba0 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 = "1b7wx2hnwnml3y10x6yxybl3hy973n2ifq3hbqh0jd72bqs615wp";
+      sha256 = "18afz6rz72j8hnfgzhyr21wh1rfy1x41iyhbcgaq0r1bd7ng1vni";
       type = "gem";
     };
-    version = "3.15.2";
+    version = "3.15.3";
   };
   mercenary = {
     groups = ["default"];
@@ -99,10 +99,10 @@
     platforms = [];
     source = {
       remotes = ["https://rubygems.org"];
-      sha256 = "1c6kq6s13idl2036b5lch8r7390f8w82cal8hcp4ml76fm2vdac7";
+      sha256 = "1l1kqw75asziwmzrig8rywxswxz8l91sc3pvns02ffsqac1a3wiz";
       type = "gem";
     };
-    version = "4.0.3";
+    version = "4.0.4";
   };
   rainbow = {
     groups = ["default"];