diff --git a/doc/changelog.d/875.miscellaneous.md b/doc/changelog.d/875.miscellaneous.md
new file mode 100644
index 00000000..ccf9d6f9
--- /dev/null
+++ b/doc/changelog.d/875.miscellaneous.md
@@ -0,0 +1 @@
+Use pep8-compliant pyparsing references
diff --git a/doc/changelog.d/878.maintenance.md b/doc/changelog.d/878.maintenance.md
new file mode 100644
index 00000000..28967715
--- /dev/null
+++ b/doc/changelog.d/878.maintenance.md
@@ -0,0 +1 @@
+Prepare 2.3.1 release
\ No newline at end of file
diff --git a/pyproject.toml b/pyproject.toml
index b9a09f02..ef616694 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -5,7 +5,7 @@ build-backend = "poetry.core.masonry.api"
 [tool.poetry]
 name = "ansys-openapi-common"
 description = "Provides a helper to create sessions for use with Ansys OpenAPI clients."
-version = "2.3.0"
+version = "2.3.1"
 license = "MIT"
 authors = ["ANSYS, Inc. <pyansys.core@ansys.com>"]
 maintainers = ["ANSYS, Inc. <pyansys.core@ansys.com>"]
diff --git a/src/ansys/openapi/common/_util.py b/src/ansys/openapi/common/_util.py
index fa11f03c..b0770c72 100644
--- a/src/ansys/openapi/common/_util.py
+++ b/src/ansys/openapi/common/_util.py
@@ -36,7 +36,6 @@
 )
 
 import pyparsing as pp
-from pyparsing import Word
 import requests
 from requests.structures import CaseInsensitiveDict
 
@@ -137,17 +136,17 @@ def __init__(self) -> None:
         token68_char = "-._~+/" + pp.nums + pp.alphas
 
         token = pp.Word(token_char)
-        token68 = pp.Combine(pp.Word(token68_char) + pp.ZeroOrMore(Word("=")))
+        token68 = pp.Combine(pp.Word(token68_char) + pp.ZeroOrMore(pp.Word("=")))
 
         name = pp.Word(pp.alphas, pp.alphanums)
-        value = pp.quotedString.setParseAction(pp.removeQuotes)
+        value = pp.quoted_string.set_parse_action(pp.remove_quotes)
         name_value_pair = name + pp.Suppress("=") + value
 
-        params = pp.Dict(pp.delimitedList(pp.Group(name_value_pair)))
+        params = pp.Dict(pp.delimited_list(pp.Group(name_value_pair)))
 
         credentials = token + (params ^ token68) ^ token
 
-        self.auth_parser = pp.delimitedList(credentials("schemes*"), delim=", ")
+        self.auth_parser = pp.delimited_list(credentials("schemes*"), delim=", ")
 
     def parse_header(self, value: str) -> CaseInsensitiveOrderedDict:
         """Parse a given header's content and return a dictionary of authentication methods and parameters or tokens.