diff --git a/pyrseas/database.py b/pyrseas/database.py
index 23e08734..b44f6308 100644
--- a/pyrseas/database.py
+++ b/pyrseas/database.py
@@ -388,7 +388,7 @@ def from_map(self, input_map, langs=None):
                 input_evttrigs.update({key: input_map[key]})
             else:
                 raise KeyError("Expected typed object, found '%s'" % key)
-        self.ndb.extensions.from_map(input_extens, langs, self.ndb)
+        self.ndb.extensions.from_map(input_extens, self.ndb)
         self.ndb.languages.from_map(input_langs)
         self.ndb.schemas.from_map(input_schemas, self.ndb)
         self.ndb.casts.from_map(input_casts, self.ndb)
@@ -521,9 +521,7 @@ def diff_map(self, input_map, quote_reserved=True):
         if quote_reserved:
             fetch_reserved_words(self.dbconn)
 
-        langs = [lang[0] for lang in self.dbconn.fetchall(
-            "SELECT name FROM pg_available_extensions() INNER JOIN pg_language ON name = lanname;")]
-        self.from_map(input_map, langs)
+        self.from_map(input_map)
         if opts.revert:
             (self.db, self.ndb) = (self.ndb, self.db)
             del self.ndb.schemas['pg_catalog']
diff --git a/pyrseas/dbobject/extension.py b/pyrseas/dbobject/extension.py
index 497637ef..839bd9bd 100644
--- a/pyrseas/dbobject/extension.py
+++ b/pyrseas/dbobject/extension.py
@@ -98,6 +98,15 @@ def alter(self, inobj, no_owner=True):
         """
         return super(Extension, self).alter(inobj, no_owner=no_owner)
 
+KNOWN_LANGS = [
+    "plpgsql",
+    "pltcl",
+    "pltclu",
+    "plperl",
+    "plperlu",
+    "plpythonu",
+    "plpython2u",
+    "plpython3u"]
 
 class ExtensionDict(DbObjectDict):
     "The collection of extensions in a database"
@@ -110,11 +119,10 @@ def _from_catalog(self):
             self[obj.key()] = obj
             self.by_oid[obj.oid] = obj
 
-    def from_map(self, inexts, langtempls, newdb):
+    def from_map(self, inexts, newdb):
         """Initalize the dictionary of extensions by converting the input map
 
         :param inexts: YAML map defining the extensions
-        :param langtempls: list of language templates
         :param newdb: dictionary of input database
         """
         for key in inexts:
@@ -123,7 +131,7 @@ def from_map(self, inexts, langtempls, newdb):
             name = key[10:]
             inobj = inexts[key]
             self[name] = Extension.from_map(name, inobj)
-            if self[name].name in langtempls:
+            if self[name].name in KNOWN_LANGS:
                 lang = {'language %s' % self[name].name: {
                     '_ext': 'e', 'owner': self[name].owner}}
                 newdb.languages.from_map(lang)
diff --git a/tests/dbobject/test_extension.py b/tests/dbobject/test_extension.py
index 405426d6..6b833507 100644
--- a/tests/dbobject/test_extension.py
+++ b/tests/dbobject/test_extension.py
@@ -22,7 +22,9 @@ def base_version(self):
             return '1.1'
         elif self.db.version < 110000:
             return '1.3'
-        return '1.4'
+        elif self.db.version < 130000:
+            return '1.4'
+        return '1.5'
 
     def test_map_extension(self):
         "Map an existing extension"
diff --git a/tests/dbobject/test_extern_file.py b/tests/dbobject/test_extern_file.py
index ffc7a1d9..bf575317 100644
--- a/tests/dbobject/test_extern_file.py
+++ b/tests/dbobject/test_extern_file.py
@@ -49,13 +49,15 @@ def test_map_casts(self):
 
     def test_map_extension(self):
         "Map extensions"
-        TRGM_VERS = '1.4'
+        TRGM_VERS = '1.5'
         if self.db.version < 90300:
             TRGM_VERS = '1.0'
         elif self.db.version < 90600:
             TRGM_VERS = '1.1'
         elif self.db.version < 110000:
             TRGM_VERS = '1.3'
+        elif self.db.version < 130000:
+            TRGM_VERS = '1.4'
         self.to_map(["CREATE EXTENSION pg_trgm"], superuser=True,
                     multiple_files=True)
         expmap = {'extension plpgsql': {
diff --git a/tests/dbobject/test_language.py b/tests/dbobject/test_language.py
index 9e7763a2..d64885ea 100644
--- a/tests/dbobject/test_language.py
+++ b/tests/dbobject/test_language.py
@@ -33,6 +33,8 @@ def test_map_language_comment(self):
 
     def test_map_language_bug_103(self):
         "Test a function created with language other than plpgsql/plperl"
+        if self.db.version >= 130000:
+            self.skipTest('Only available before PG 13')
         try:
             self.to_map(["CREATE OR REPLACE LANGUAGE plpython3u"])
         except psycopg2.OperationalError as e: