diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index aafdf88..1478887 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,7 +15,7 @@ on:
 # MODIFIED END
 env:
   GALAXY_FORK: galaxyproject
-  GALAXY_BRANCH: release_23.0  # MODIFIED
+  GALAXY_BRANCH: release_23.1  # MODIFIED
   MAX_CHUNKS: 40
 jobs:
   setup:
diff --git a/.github/workflows/pr.yml b/.github/workflows/pr.yml
index ad8c1c7..5a7ba94 100644
--- a/.github/workflows/pr.yml
+++ b/.github/workflows/pr.yml
@@ -23,7 +23,7 @@ on:
 # MODIFIED END
 env:
   GALAXY_FORK: galaxyproject
-  GALAXY_BRANCH: release_23.0  # MODIFIED
+  GALAXY_BRANCH: release_23.1  # MODIFIED
   MAX_CHUNKS: 10  # MODIFIED
 jobs:
   # the setup job does two things:
diff --git a/tools/suite_qiime2_core__tools/qiime2_core__tools__import.xml b/tools/suite_qiime2_core__tools/qiime2_core__tools__import.xml
index 30d8939..3908513 100644
--- a/tools/suite_qiime2_core__tools/qiime2_core__tools__import.xml
+++ b/tools/suite_qiime2_core__tools/qiime2_core__tools__import.xml
@@ -20,6 +20,7 @@ for:
         <configfile name="inputs">&lt;%
 # This is an exercise in cheating the Cheetah
 import json
+from collections.abc import MutableMapping
 
 def expand_collection(collection):
     # All of this work is just to extract the
@@ -28,7 +29,7 @@ def expand_collection(collection):
             for d in collection]
 
 def stringify(obj):
-    if type(obj) is dict:
+    if isinstance(obj, MutableMapping):
         new = {}
         for key, value in obj.items():
             if (key.startswith('__') and key.endswith('__')