diff --git a/requirements.txt b/requirements.txt
index 6789459..bba8f10 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,4 @@
 jinja2
+pyparsing
 requests
 tqdm
diff --git a/rust2rpm/cfg.py b/rust2rpm/cfg.py
index 5e3d10b..79567e6 100644
--- a/rust2rpm/cfg.py
+++ b/rust2rpm/cfg.py
@@ -5,9 +5,9 @@ import platform
 import sys
 
 import pyparsing as pp
-from pyparsing.exceptions import ParseException
+from pyparsing import ParseException
 
-pp.ParserElement.enable_packrat()
+pp.ParserElement.enablePackrat()
 
 # ConfigurationPredicate :
 #      ConfigurationOption
@@ -33,14 +33,14 @@ pp.ParserElement.enable_packrat()
 IDENT_CHARS = pp.alphas + '_', pp.alphanums + '_'
 
 def _call(word, arg):
-    return pp.Group(pp.Literal(word) + pp.Suppress('(') + arg + pp.Suppress(')'), aslist=True)
+    return pp.Group(pp.Literal(word) + pp.Suppress('(') + arg + pp.Suppress(')'))
 
 @functools.cache
 def cfg_grammar():
     pred = pp.Forward()
 
     ident = pp.Word(IDENT_CHARS[0], IDENT_CHARS[1])
-    option = pp.Group(ident + pp.Optional(pp.Suppress('=') + pp.quotedString), aslist=True)
+    option = pp.Group(ident + pp.Optional(pp.Suppress('=') + pp.quotedString))
 
     not_ = _call('not', pred)
 
@@ -96,6 +96,8 @@ def evaluate_variable(name):
 
 def evaluate(expr, nested=False):
     # print(f'evaluate: {expr}')
+    if hasattr(expr, 'asList'):
+        expr = expr.asList()  # compat with pyparsing 2.7.x
     match expr:
         case ['cfg', expr] if not nested:
             return evaluate(expr, True)
@@ -116,5 +118,5 @@ def evaluate(expr, nested=False):
             raise ValueError
 
 def parse_and_evaluate(expr):
-    parsed = cfg_grammar().parse_string(expr)
+    parsed = cfg_grammar().parseString(expr)
     return evaluate(parsed[0])
diff --git a/rust2rpm/tests/test_cfg.py b/rust2rpm/tests/test_cfg.py
index 4a86abb..949b529 100644
--- a/rust2rpm/tests/test_cfg.py
+++ b/rust2rpm/tests/test_cfg.py
@@ -5,7 +5,7 @@ from rust2rpm import cfg
 def test_pyparsing_run_tests():
     g = cfg.cfg_grammar()
 
-    g.run_tests("""\
+    g.runTests("""\
     cfg(target_os = "macos")
     cfg(any(foo, bar))
     cfg(all(unix, target_pointer_width = "32"))