diff --git a/pkgs/tools/misc/html-proofer/Gemfile.lock b/pkgs/tools/misc/html-proofer/Gemfile.lock
index 6b0d5d3387c2..46c6ffb92425 100644
--- a/pkgs/tools/misc/html-proofer/Gemfile.lock
+++ b/pkgs/tools/misc/html-proofer/Gemfile.lock
@@ -1,41 +1,30 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (5.2.3)
-      concurrent-ruby (~> 1.0, >= 1.0.2)
-      i18n (>= 0.7, < 2)
-      minitest (~> 5.1)
-      tzinfo (~> 1.1)
-    addressable (2.6.0)
-      public_suffix (>= 2.0.2, < 4.0)
-    concurrent-ruby (1.1.5)
+    addressable (2.7.0)
+      public_suffix (>= 2.0.2, < 5.0)
     ethon (0.12.0)
       ffi (>= 1.3.0)
     ffi (1.11.1)
-    html-proofer (3.11.1)
-      activesupport (>= 4.2, < 6.0)
+    html-proofer (3.12.0)
       addressable (~> 2.3)
-      mercenary (~> 0.3.2)
-      nokogiri (~> 1.9)
+      mercenary (~> 0.3)
+      nokogiri (~> 1.10)
       parallel (~> 1.3)
       rainbow (~> 3.0)
+      timerizer (~> 0.3)
       typhoeus (~> 1.3)
       yell (~> 2.0)
-    i18n (1.6.0)
-      concurrent-ruby (~> 1.0)
     mercenary (0.3.6)
     mini_portile2 (2.4.0)
-    minitest (5.11.3)
     nokogiri (1.10.4)
       mini_portile2 (~> 2.4.0)
     parallel (1.17.0)
-    public_suffix (3.1.1)
+    public_suffix (4.0.1)
     rainbow (3.0.0)
-    thread_safe (0.3.6)
+    timerizer (0.3.2)
     typhoeus (1.3.1)
       ethon (>= 0.9.0)
-    tzinfo (1.2.5)
-      thread_safe (~> 0.1)
     yell (2.2.0)
 
 PLATFORMS
diff --git a/pkgs/tools/misc/html-proofer/gemset.nix b/pkgs/tools/misc/html-proofer/gemset.nix
index 256243f3d5d1..46c6734c0250 100644
--- a/pkgs/tools/misc/html-proofer/gemset.nix
+++ b/pkgs/tools/misc/html-proofer/gemset.nix
@@ -1,35 +1,14 @@
 {
-  activesupport = {
-    dependencies = ["concurrent-ruby" "i18n" "minitest" "tzinfo"];
-    groups = ["default"];
-    platforms = [];
-    source = {
-      remotes = ["https://rubygems.org"];
-      sha256 = "110vp4frgkw3mpzlmshg2f2ig09cknls2w68ym1r1s39d01v0mi8";
-      type = "gem";
-    };
-    version = "5.2.3";
-  };
   addressable = {
     dependencies = ["public_suffix"];
     groups = ["default"];
     platforms = [];
     source = {
       remotes = ["https://rubygems.org"];
-      sha256 = "0bcm2hchn897xjhqj9zzsxf3n9xhddymj4lsclz508f4vw3av46l";
+      sha256 = "1fvchp2rhp2rmigx7qglf69xvjqvzq7x0g49naliw29r2bz656sy";
       type = "gem";
     };
-    version = "2.6.0";
-  };
-  concurrent-ruby = {
-    groups = ["default"];
-    platforms = [];
-    source = {
-      remotes = ["https://rubygems.org"];
-      sha256 = "1x07r23s7836cpp5z9yrlbpljcxpax14yw4fy4bnp6crhr6x24an";
-      type = "gem";
-    };
-    version = "1.1.5";
+    version = "2.7.0";
   };
   ethon = {
     dependencies = ["ffi"];
@@ -53,26 +32,15 @@
     version = "1.11.1";
   };
   html-proofer = {
-    dependencies = ["activesupport" "addressable" "mercenary" "nokogiri" "parallel" "rainbow" "typhoeus" "yell"];
+    dependencies = ["addressable" "mercenary" "nokogiri" "parallel" "rainbow" "timerizer" "typhoeus" "yell"];
     groups = ["default"];
     platforms = [];
     source = {
       remotes = ["https://rubygems.org"];
-      sha256 = "0kpcz7p0yjr1y9fs8gila2bkgb8y6qkyqv5a8yymw0hkvddnqig4";
+      sha256 = "1a5h5ijrngfd4ri36g7bs5lcg4001i5xx7nlk35rsg34xpy8mp04";
       type = "gem";
     };
-    version = "3.11.1";
-  };
-  i18n = {
-    dependencies = ["concurrent-ruby"];
-    groups = ["default"];
-    platforms = [];
-    source = {
-      remotes = ["https://rubygems.org"];
-      sha256 = "1hfxnlyr618s25xpafw9mypa82qppjccbh292c4l3bj36az7f6wl";
-      type = "gem";
-    };
-    version = "1.6.0";
+    version = "3.12.0";
   };
   mercenary = {
     groups = ["default"];
@@ -94,16 +62,6 @@
     };
     version = "2.4.0";
   };
-  minitest = {
-    groups = ["default"];
-    platforms = [];
-    source = {
-      remotes = ["https://rubygems.org"];
-      sha256 = "0icglrhghgwdlnzzp4jf76b0mbc71s80njn5afyfjn4wqji8mqbq";
-      type = "gem";
-    };
-    version = "5.11.3";
-  };
   nokogiri = {
     dependencies = ["mini_portile2"];
     groups = ["default"];
@@ -130,10 +88,10 @@
     platforms = [];
     source = {
       remotes = ["https://rubygems.org"];
-      sha256 = "0g9ds2ffzljl6jjmkjffwxc1z6lh5nkqqmhhkxjk71q5ggv0rkpm";
+      sha256 = "0xnfv2j2bqgdpg2yq9i2rxby0w2sc9h5iyjkpaas2xknwrgmhdb0";
       type = "gem";
     };
-    version = "3.1.1";
+    version = "4.0.1";
   };
   rainbow = {
     groups = ["default"];
@@ -145,15 +103,15 @@
     };
     version = "3.0.0";
   };
-  thread_safe = {
+  timerizer = {
     groups = ["default"];
     platforms = [];
     source = {
       remotes = ["https://rubygems.org"];
-      sha256 = "0nmhcgq6cgz44srylra07bmaw99f5271l0dpsvl5f75m44l0gmwy";
+      sha256 = "06zk04kprgj0abws15wqrk4q29f3wcx7z2jj3v25nnb2517lk66c";
       type = "gem";
     };
-    version = "0.3.6";
+    version = "0.3.2";
   };
   typhoeus = {
     dependencies = ["ethon"];
@@ -166,17 +124,6 @@
     };
     version = "1.3.1";
   };
-  tzinfo = {
-    dependencies = ["thread_safe"];
-    groups = ["default"];
-    platforms = [];
-    source = {
-      remotes = ["https://rubygems.org"];
-      sha256 = "1fjx9j327xpkkdlxwmkl3a8wqj7i4l4jwlrv3z13mg95z9wl253z";
-      type = "gem";
-    };
-    version = "1.2.5";
-  };
   yell = {
     groups = ["default"];
     platforms = [];