diff --git a/pkgs/tools/misc/html-proofer/Gemfile.lock b/pkgs/tools/misc/html-proofer/Gemfile.lock
index 489fa555c5de..c918577fded7 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 (1.13.1)
-    html-proofer (3.16.0)
+    html-proofer (3.17.0)
       addressable (~> 2.3)
       mercenary (~> 0.3)
       nokogumbo (~> 2.0)
@@ -20,7 +20,7 @@ GEM
       mini_portile2 (~> 2.4.0)
     nokogumbo (2.0.2)
       nokogiri (~> 1.8, >= 1.8.4)
-    parallel (1.19.2)
+    parallel (1.20.0)
     public_suffix (4.0.6)
     rainbow (3.0.0)
     typhoeus (1.4.0)
diff --git a/pkgs/tools/misc/html-proofer/gemset.nix b/pkgs/tools/misc/html-proofer/gemset.nix
index bdd0bbc20c9f..b617ebe7b0e5 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 = "18s8l3nys0lvdkqpfg3c1rd84c5j4dmlx503wnksw9skbzn7l93m";
+      sha256 = "0vjy9r9lwr0rfxxadj4rfkl94b2rz6avgq4h54g6b7x1jmx6b3sd";
       type = "gem";
     };
-    version = "3.16.0";
+    version = "3.17.0";
   };
   mercenary = {
     groups = ["default"];
@@ -89,10 +89,10 @@
     platforms = [];
     source = {
       remotes = ["https://rubygems.org"];
-      sha256 = "17b127xxmm2yqdz146qwbs57046kn0js1h8synv01dwqz2z1kp2l";
+      sha256 = "1wci3dimgrap91nw5vnq4qa2vfmxga27m6sfmn8caskhzwxwv1dg";
       type = "gem";
     };
-    version = "1.19.2";
+    version = "1.20.0";
   };
   public_suffix = {
     groups = ["default"];