diff --git a/docker/development/etc/nginx/conf.d/custom.conf b/docker/development/etc/nginx/conf.d/custom.conf
index f26dc3049..4672e3de5 100644
--- a/docker/development/etc/nginx/conf.d/custom.conf
+++ b/docker/development/etc/nginx/conf.d/custom.conf
@@ -2,3 +2,9 @@
 
 # Disable access logs
 access_log off;
+
+# Allow request headers up to 32k (nginx default is 8k). Large JWT cookies can push the
+# Cookie header past 8k, and nginx would then reject the request with a bare 400
+# before it reaches the application.
+client_header_buffer_size 8k;
+large_client_header_buffers 8 32k;
diff --git a/docker/production/etc/nginx/conf.d/custom.conf b/docker/production/etc/nginx/conf.d/custom.conf
index f26dc3049..4672e3de5 100644
--- a/docker/production/etc/nginx/conf.d/custom.conf
+++ b/docker/production/etc/nginx/conf.d/custom.conf
@@ -2,3 +2,9 @@
 
 # Disable access logs
 access_log off;
+
+# Allow request headers up to 32k (nginx default is 8k). Large JWT cookies can push the
+# Cookie header past 8k, and nginx would then reject the request with a bare 400
+# before it reaches the application.
+client_header_buffer_size 8k;
+large_client_header_buffers 8 32k;