diff --git a/pkgs/servers/web-apps/discourse/rubyEnv/Gemfile.lock b/pkgs/servers/web-apps/discourse/rubyEnv/Gemfile.lock
index af968cdf331..adefcc318a6 100644
--- a/pkgs/servers/web-apps/discourse/rubyEnv/Gemfile.lock
+++ b/pkgs/servers/web-apps/discourse/rubyEnv/Gemfile.lock
@@ -186,11 +186,6 @@ GEM
     jwt (2.2.3)
     kgio (2.11.3)
     libv8-node (15.14.0.1)
-    libv8-node (15.14.0.1-arm64-darwin-20)
-    libv8-node (15.14.0.1-x86_64-darwin-18)
-    libv8-node (15.14.0.1-x86_64-darwin-19)
-    libv8-node (15.14.0.1-x86_64-darwin-20)
-    libv8-node (15.14.0.1-x86_64-linux)
     listen (3.5.1)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
@@ -465,12 +460,7 @@ GEM
     zeitwerk (2.4.2)
 
 PLATFORMS
-  arm64-darwin-20
   ruby
-  x86_64-darwin-18
-  x86_64-darwin-19
-  x86_64-darwin-20
-  x86_64-linux
 
 DEPENDENCIES
   actionmailer (= 6.1.3.2)
@@ -600,4 +590,4 @@ DEPENDENCIES
   yaml-lint
 
 BUNDLED WITH
-   2.2.16
+   2.2.20
diff --git a/pkgs/servers/web-apps/discourse/update.py b/pkgs/servers/web-apps/discourse/update.py
index d10a49be58f..ae4dadfc3a7 100755
--- a/pkgs/servers/web-apps/discourse/update.py
+++ b/pkgs/servers/web-apps/discourse/update.py
@@ -173,6 +173,10 @@ def update(rev):
             f.write(repo.get_file(fn, rev))
 
     subprocess.check_output(['bundle', 'lock'], cwd=rubyenv_dir)
+    for platform in ['arm64-darwin-20', 'x86_64-darwin-18',
+                     'x86_64-darwin-19', 'x86_64-darwin-20',
+                     'x86_64-linux']:
+        subprocess.check_output(['bundle', 'lock', '--remove-platform', platform], cwd=rubyenv_dir)
     subprocess.check_output(['bundix'], cwd=rubyenv_dir)
 
     _call_nix_update('discourse', repo.rev2version(rev))