diff --git a/lib/simplejson/__init__.py b/lib/simplejson/__init__.py
index c79ad1bc..993d64d3 100644
--- a/lib/simplejson/__init__.py
+++ b/lib/simplejson/__init__.py
@@ -118,7 +118,7 @@ Serializing multiple objects to JSON lines (newline-delimited JSON)::
 
 """
 from __future__ import absolute_import
-__version__ = '3.18.0'
+__version__ = '3.18.3'
 __all__ = [
     'dump', 'dumps', 'load', 'loads',
     'JSONDecoder', 'JSONDecodeError', 'JSONEncoder',
diff --git a/lib/simplejson/encoder.py b/lib/simplejson/encoder.py
index 2bc8bbad..e93fe43f 100644
--- a/lib/simplejson/encoder.py
+++ b/lib/simplejson/encoder.py
@@ -32,6 +32,7 @@ ESCAPE_DCT = {
 for i in range(0x20):
     #ESCAPE_DCT.setdefault(chr(i), '\\u{0:04x}'.format(i))
     ESCAPE_DCT.setdefault(chr(i), '\\u%04x' % (i,))
+del i
 
 FLOAT_REPR = repr
 
diff --git a/requirements.txt b/requirements.txt
index b5e6dd57..754a9e9c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -39,7 +39,7 @@ pytz==2022.7.1
 requests==2.28.2
 requests-oauthlib==1.3.1
 rumps==0.4.0; platform_system == "Darwin"
-simplejson==3.18.0
+simplejson==3.18.3
 six==1.16.0
 soupsieve==2.3.2.post1
 tempora==5.2.1