diff --git a/requirements/edx/base.txt b/requirements/edx/base.txt
index dd7aac186ede..4861b7be1f63 100644
--- a/requirements/edx/base.txt
+++ b/requirements/edx/base.txt
@@ -1256,7 +1256,7 @@ wheel==0.45.1
     # via django-pipeline
 wrapt==1.17.2
     # via -r requirements/edx/kernel.in
-xblock[django]==5.1.0
+xblock[django]==5.1.1
     # via
     #   -r requirements/edx/kernel.in
     #   acid-xblock
diff --git a/requirements/edx/development.txt b/requirements/edx/development.txt
index 070b898e7422..ae377bd5cc7c 100644
--- a/requirements/edx/development.txt
+++ b/requirements/edx/development.txt
@@ -2253,7 +2253,7 @@ wrapt==1.17.2
     #   -r requirements/edx/doc.txt
     #   -r requirements/edx/testing.txt
     #   astroid
-xblock[django]==5.1.0
+xblock[django]==5.1.1
     # via
     #   -r requirements/edx/doc.txt
     #   -r requirements/edx/testing.txt
diff --git a/requirements/edx/doc.txt b/requirements/edx/doc.txt
index 8529d74127d3..354e85c98f55 100644
--- a/requirements/edx/doc.txt
+++ b/requirements/edx/doc.txt
@@ -1583,7 +1583,7 @@ wrapt==1.17.2
     # via
     #   -r requirements/edx/base.txt
     #   astroid
-xblock[django]==5.1.0
+xblock[django]==5.1.1
     # via
     #   -r requirements/edx/base.txt
     #   acid-xblock
diff --git a/requirements/edx/testing.txt b/requirements/edx/testing.txt
index 2e9ff968b70b..799f8b16ed26 100644
--- a/requirements/edx/testing.txt
+++ b/requirements/edx/testing.txt
@@ -1673,7 +1673,7 @@ wrapt==1.17.2
     # via
     #   -r requirements/edx/base.txt
     #   astroid
-xblock[django]==5.1.0
+xblock[django]==5.1.1
     # via
     #   -r requirements/edx/base.txt
     #   acid-xblock
diff --git a/xmodule/tests/test_export.py b/xmodule/tests/test_export.py
index 5a52d145a5f0..e4a5cbcdae4f 100644
--- a/xmodule/tests/test_export.py
+++ b/xmodule/tests/test_export.py
@@ -143,9 +143,22 @@ def test_export_roundtrip(self, course_dir, mock_get):
 
         print("Checking block equality")
         for location in initial_import.modules[course_id].keys():
-            print(("Checking", location))
-            assert blocks_are_equivalent(initial_import.modules[course_id][location],
-                                         second_import.modules[course_id][location])
+            initial_block = initial_import.modules[course_id][location]
+            reimported_block = second_import.modules[course_id][location]
+            if location.block_type == "error":
+                # Error blocks store their stacktrace as a field on the block
+                # itself. We cache failed XBlock tag -> class lookups, so a
+                # PluginError raised from the uncached state vs cached state
+                # will generate different stacktraces, making the two blocks
+                # "different" as far as blocks_are_equivalent() is concerned. It
+                # doesn't *really* matter if the stacktraces are different
+                # though, so we'll do a much less thorough comparison for error
+                # blocks:
+                assert type(initial_block) == type(reimported_block)  # pylint:disable=unidiomatic-typecheck
+                assert initial_block.display_name == reimported_block.display_name
+            else:
+                print(("Checking", location))
+                assert blocks_are_equivalent(initial_block, reimported_block)
 
 
 class TestEdxJsonEncoder(unittest.TestCase):