diff --git a/pkgs/tools/misc/html-proofer/Gemfile.lock b/pkgs/tools/misc/html-proofer/Gemfile.lock
index ce75c4e7fd8..3bd45730313 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 (1.14.2)
-    html-proofer (3.18.3)
+    html-proofer (3.18.5)
       addressable (~> 2.3)
       mercenary (~> 0.3)
       nokogumbo (~> 2.0)
diff --git a/pkgs/tools/misc/html-proofer/gemset.nix b/pkgs/tools/misc/html-proofer/gemset.nix
index da26cc347fe..d6801512ca4 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 = "0l0nkk0px6bc4g3xwc1c5fyi0c3n8sgl1zy94vqdzllfmkjvfggc";
+      sha256 = "0bz0041fizdmggc5k9an4s3qk6diyybn2agcia2wr96vymfb2qjh";
       type = "gem";
     };
-    version = "3.18.3";
+    version = "3.18.5";
   };
   mercenary = {
     groups = ["default"];