diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 192ddce609..16c854f835 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -170,7 +170,7 @@ bundle exec rake compile test:memcheck
 ```
 
 
-Note that by default the test suite will run a major GC after each test completes. This has shown to be useful for localizing some classes of memory bugs, but does slow the suite down. Some variations of the test suite behavior are available (see `test/helper.rb` for more info):
+Note that by you can run the test suite with a variety of GC behaviors. For example, running a major after each test completes has, on occasion, been useful for localizing some classes of memory bugs, but does slow the suite down. Some variations of the test suite behavior are available (see `test/helper.rb` for more info):
 
 ``` sh
 # see failure messages immediately
diff --git a/dependencies.yml b/dependencies.yml
index 98eccc8984..5b5c9faa4c 100644
--- a/dependencies.yml
+++ b/dependencies.yml
@@ -1,7 +1,7 @@
 libxml2:
-  version: "2.10.3"
-  sha256: "5d2cc3d78bec3dbe212a9d7fa629ada25a7da928af432c93060ff5c17ee28a9c"
-  # sha-256 hash provided in https://download.gnome.org/sources/libxml2/2.10/libxml2-2.10.3.sha256sum
+  version: "2.10.4"
+  sha256: "ed0c91c5845008f1936739e4eee2035531c1c94742c6541f44ee66d885948d45"
+  # sha-256 hash provided in https://download.gnome.org/sources/libxml2/2.10/libxml2-2.10.4.sha256sum
 
 libxslt:
   version: "1.1.37"
diff --git a/test/helper.rb b/test/helper.rb
index 0f868fc9e7..957a575430 100644
--- a/test/helper.rb
+++ b/test/helper.rb
@@ -4,10 +4,10 @@
 # Some environment variables that are used to configure the test suite:
 # - NOKOGIRI_TEST_FAIL_FAST: if set to anything, emit test failure messages immediately upon failure
 # - NOKOGIRI_TEST_GC_LEVEL: (roughly in order of stress)
-#   - "normal" - normal GC functionality
+#   - "normal" - normal GC functionality (default)
 #   - "minor" - force a minor GC cycle after each test
-#   - "major" (default for Rubies without compaction) - force a major GC cycle after each test
-#   - "compact" (default for Rubies with compaction) - force a major GC after each test and GC compaction after every 20 tests
+#   - "major" - force a major GC cycle after each test
+#   - "compact" - force a major GC after each test and GC compaction after every 20 tests
 #   - "verify" - force a major GC after each test and verify references-after-compaction after every 20 tests
 #   - "stress" - run tests with GC.stress set to true
 # - NOKOGIRI_GC: read more in test/test_memory_leak.rb
@@ -144,12 +144,8 @@ def initialize_nokogiri_test_gc_level
         "compact"
       elsif (ENV["NOKOGIRI_TEST_GC_LEVEL"] == "verify") && defined?(GC.verify_compaction_references)
         "verify"
-      elsif RUBY_ENGINE == "truffleruby"
-        "normal"
-      elsif defined?(GC.compact)
-        "compact"
       else
-        "major"
+        "normal"
       end
 
       if ["compact", "verify"].include?(@@gc_level)
diff --git a/test/xml/test_node.rb b/test/xml/test_node.rb
index 80fb66d37b..cb6523dd61 100644
--- a/test/xml/test_node.rb
+++ b/test/xml/test_node.rb
@@ -1141,7 +1141,10 @@ def test_namespace_without_an_href_on_html_node
           node = html.at("div").children.first
           refute_nil(node)
 
-          if Nokogiri.uses_libxml?(">= 2.9.12")
+          if Nokogiri.uses_libxml?(">= 2.10.4") || Nokogiri.jruby?
+            assert_empty(node.namespaces.keys)
+            assert_equal("<o:p>foo</o:p>", node.to_html)
+          elsif Nokogiri.uses_libxml?(">= 2.9.12")
             assert_empty(node.namespaces.keys)
             assert_equal("<p>foo</p>", node.to_html)
           elsif Nokogiri.uses_libxml?
@@ -1149,9 +1152,6 @@ def test_namespace_without_an_href_on_html_node
             assert(node.namespaces.key?("xmlns:o"))
             assert_nil(node.namespaces["xmlns:o"])
             assert_equal("<p>foo</p>", node.to_html)
-          else # jruby
-            assert_empty(node.namespaces.keys)
-            assert_equal("<o:p>foo</o:p>", node.to_html)
           end
         end