diff --git a/src/requests/utils.py b/src/requests/utils.py
index a603a8638c..44fc70d251 100644
--- a/src/requests/utils.py
+++ b/src/requests/utils.py
@@ -549,7 +549,15 @@ def get_encoding_from_headers(headers):
     content_type, params = _parse_content_type_header(content_type)
 
     if "charset" in params:
-        return params["charset"].strip("'\"")
+        charset = params["charset"]
+        # Check if charset is a boolean value
+        if charset is True:
+            return "ISO-8859-1"
+        # Check if charset is explicitly False
+        elif charset is False:
+            return None
+        else:
+            return charset.strip("'\"")
 
     if "text" in content_type:
         return "ISO-8859-1"
@@ -558,6 +566,8 @@ def get_encoding_from_headers(headers):
         # Assume UTF-8 based on RFC 4627: https://www.ietf.org/rfc/rfc4627.txt since the charset was unset
         return "utf-8"
 
+    return None
+
 
 def stream_decode_response_unicode(iterator, r):
     """Stream decodes an iterator."""
diff --git a/tests/test_utils.py b/tests/test_utils.py
index 8988eaf69c..4043a1928f 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -617,6 +617,11 @@ def test__parse_content_type_header(value, expected):
             "utf-8",
         ),
         (CaseInsensitiveDict({"content-type": "text/plain"}), "ISO-8859-1"),
+        (CaseInsensitiveDict({"content-type": "text/html; charset"}), "ISO-8859-1"),
+        (
+            CaseInsensitiveDict({"content-type": "application/json; charset"}),
+            "ISO-8859-1",
+        ),
     ),
 )
 def test_get_encoding_from_headers(value, expected):