diff --git a/Cargo.lock b/Cargo.lock
index 914bfd6d..fdc0eb72 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -28,12 +28,6 @@ dependencies = [
  "memchr",
 ]
 
-[[package]]
-name = "arrayvec"
-version = "0.5.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "23b62fc65de8e4e7f52534fb52b0f3ed04746ae267519eef2a83941e8085068b"
-
 [[package]]
 name = "async-broadcast"
 version = "0.4.0"
@@ -1005,19 +999,6 @@ version = "1.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "830d08ce1d1d941e6b30645f1a0eb5643013d835ce3779a5fc208261dbe10f55"
 
-[[package]]
-name = "lexical-core"
-version = "0.7.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6607c62aa161d23d17a9072cc5da0be67cdfc89d3afb1e8d9c842bebc2525ffe"
-dependencies = [
- "arrayvec",
- "bitflags",
- "cfg-if 1.0.0",
- "ryu",
- "static_assertions",
-]
-
 [[package]]
 name = "libc"
 version = "0.2.125"
@@ -1212,6 +1193,12 @@ version = "0.3.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2a60c7ce501c71e03a9c9c0d35b861413ae925bd979cc7a4e30d060069aaac8d"
 
+[[package]]
+name = "minimal-lexical"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "68354c5c6bd36d73ff3feceb05efa59b6acb7626617f4962be322a825e61f79a"
+
 [[package]]
 name = "miniz_oxide"
 version = "0.5.1"
@@ -1320,13 +1307,12 @@ dependencies = [
 
 [[package]]
 name = "nom"
-version = "5.1.2"
+version = "7.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ffb4262d26ed83a1c0a33a38fe2bb15797329c85770da05e6b828ddb782627af"
+checksum = "a8903e5a29a317527874d0402f867152a3d21c908bb0b933e416c65e301d4c36"
 dependencies = [
- "lexical-core",
  "memchr",
- "version_check",
+ "minimal-lexical",
 ]
 
 [[package]]
diff --git a/melib/Cargo.toml b/melib/Cargo.toml
index 07c632ce..02799f41 100644
--- a/melib/Cargo.toml
+++ b/melib/Cargo.toml
@@ -22,7 +22,7 @@ path = "src/lib.rs"
 bitflags = "1.0"
 data-encoding = "2.1.1"
 encoding = "0.2.33"
-nom = { version = "5" }
+nom = { version = "7" }
 
 indexmap = { version = "^1.5", features = ["serde-1", ] }
 notify = { version = "4.0.15", optional = true }
diff --git a/melib/src/backends/imap/managesieve.rs b/melib/src/backends/imap/managesieve.rs
index 4eb36955..56e3edd9 100644
--- a/melib/src/backends/imap/managesieve.rs
+++ b/melib/src/backends/imap/managesieve.rs
@@ -24,15 +24,15 @@ use crate::conf::AccountSettings;
 use crate::error::{MeliError, Result};
 use crate::get_conf_val;
 use nom::{
-    branch::alt, bytes::complete::tag, combinator::map, error::ErrorKind,
-    multi::separated_nonempty_list, sequence::separated_pair, IResult,
+    branch::alt, bytes::complete::tag, combinator::map, error::Error as NomError, error::ErrorKind,
+    multi::separated_list1, sequence::separated_pair, IResult,
 };
 use std::str::FromStr;
 use std::sync::{Arc, Mutex};
 use std::time::SystemTime;
 
 pub fn managesieve_capabilities(input: &[u8]) -> Result<Vec<(&[u8], &[u8])>> {
-    let (_, ret) = separated_nonempty_list(
+    let (_, ret) = separated_list1(
         tag(b"\r\n"),
         alt((
             separated_pair(quoted_raw, tag(b" "), quoted_raw),
@@ -58,7 +58,10 @@ fn test_managesieve_capabilities() {
 // Return a byte sequence surrounded by "s and decoded if necessary
 pub fn quoted_raw(input: &[u8]) -> IResult<&[u8], &[u8]> {
     if input.is_empty() || input[0] != b'"' {
-        return Err(nom::Err::Error((input, ErrorKind::Tag)));
+        return Err(nom::Err::Error(NomError {
+            input,
+            code: ErrorKind::Tag,
+        }));
     }
 
     let mut i = 1;
@@ -69,7 +72,10 @@ pub fn quoted_raw(input: &[u8]) -> IResult<&[u8], &[u8]> {
         i += 1;
     }
 
-    Err(nom::Err::Error((input, ErrorKind::Tag)))
+    Err(nom::Err::Error(NomError {
+        input,
+        code: ErrorKind::Tag,
+    }))
 }
 
 pub trait ManageSieve {
diff --git a/melib/src/backends/imap/protocol_parser.rs b/melib/src/backends/imap/protocol_parser.rs
index 465ce96a..6a5c8be8 100644
--- a/melib/src/backends/imap/protocol_parser.rs
+++ b/melib/src/backends/imap/protocol_parser.rs
@@ -33,7 +33,7 @@ use nom::{
     character::complete::digit1,
     character::is_digit,
     combinator::{map, map_res, opt},
-    multi::{fold_many1, length_data, many0, many1, separated_nonempty_list},
+    multi::{fold_many1, length_data, many0, many1, separated_list1},
     sequence::{delimited, preceded},
 };
 use std::convert::TryFrom;
@@ -823,7 +823,7 @@ macro_rules! flags_to_imap_list {
 pub fn capabilities(input: &[u8]) -> IResult<&[u8], Vec<&[u8]>> {
     let (input, _) = take_until("CAPABILITY ")(input)?;
     let (input, _) = tag("CAPABILITY ")(input)?;
-    let (input, ret) = separated_nonempty_list(tag(" "), is_not(" ]\r\n"))(input)?;
+    let (input, ret) = separated_list1(tag(" "), is_not(" ]\r\n"))(input)?;
     let (input, _) = take_until("\r\n")(input)?;
     let (input, _) = tag("\r\n")(input)?;
     Ok((input, ret))
@@ -981,7 +981,7 @@ pub fn search_results<'a>(input: &'a [u8]) -> IResult<&'a [u8], Vec<ImapNum>> {
     alt((
         |input: &'a [u8]| -> IResult<&'a [u8], Vec<ImapNum>> {
             let (input, _) = tag("* SEARCH ")(input)?;
-            let (input, list) = separated_nonempty_list(
+            let (input, list) = separated_list1(
                 tag(b" "),
                 map_res(is_not(" \r\n"), |s: &[u8]| {
                     ImapNum::from_str(unsafe { std::str::from_utf8_unchecked(s) })
@@ -1367,7 +1367,7 @@ pub fn envelope_addresses<'a>(
             let (input, _) = tag("(")(input)?;
             let (input, envelopes) = fold_many1(
                 delimited(tag("("), envelope_address, tag(")")),
-                SmallVec::new(),
+                SmallVec::new,
                 |mut acc, item| {
                     acc.push(item);
                     acc
@@ -1472,11 +1472,11 @@ pub fn quoted_or_nil(input: &[u8]) -> IResult<&[u8], Option<Vec<u8>>> {
     alt((map(tag("NIL"), |_| None), map(quoted, Some)))(input.ltrim())
 }
 
-pub fn uid_fetch_envelopes_response(
-    input: &[u8],
-) -> IResult<&[u8], Vec<(UID, Option<(Flag, Vec<String>)>, Envelope)>> {
+pub fn uid_fetch_envelopes_response<'a>(
+    input: &'a [u8],
+) -> IResult<&'a [u8], Vec<(UID, Option<(Flag, Vec<String>)>, Envelope)>> {
     many0(
-        |input: &[u8]| -> IResult<&[u8], (UID, Option<(Flag, Vec<String>)>, Envelope)> {
+        |input: &'a [u8]| -> IResult<&'a [u8], (UID, Option<(Flag, Vec<String>)>, Envelope)> {
             let (input, _) = tag("* ")(input)?;
             let (input, _) = take_while(is_digit)(input)?;
             let (input, _) = tag(" FETCH (")(input)?;
diff --git a/melib/src/backends/mbox.rs b/melib/src/backends/mbox.rs
index 5dad56fa..a5f55894 100644
--- a/melib/src/backends/mbox.rs
+++ b/melib/src/backends/mbox.rs
@@ -131,7 +131,7 @@ use crate::shellexpand::ShellExpandTrait;
 use nom::bytes::complete::tag;
 use nom::character::complete::digit1;
 use nom::combinator::map_res;
-use nom::{self, error::ErrorKind, IResult};
+use nom::{self, error::Error as NomError, error::ErrorKind, IResult};
 
 extern crate notify;
 use self::notify::{watcher, DebouncedEvent, RecursiveMode, Watcher};
@@ -491,7 +491,10 @@ impl MboxFormat {
                         }
                         Err(err) => {
                             debug!("Could not parse mail {:?}", err);
-                            Err(nom::Err::Error((input, ErrorKind::Tag)))
+                            Err(nom::Err::Error(NomError {
+                                input,
+                                code: ErrorKind::Tag,
+                            }))
                         }
                     }
                 } else {
@@ -535,7 +538,10 @@ impl MboxFormat {
                         }
                         Err(err) => {
                             debug!("Could not parse mail at {:?}", err);
-                            Err(nom::Err::Error((input, ErrorKind::Tag)))
+                            Err(nom::Err::Error(NomError {
+                                input,
+                                code: ErrorKind::Tag,
+                            }))
                         }
                     }
                 }
@@ -589,7 +595,10 @@ impl MboxFormat {
                         }
                         Err(err) => {
                             debug!("Could not parse mail {:?}", err);
-                            Err(nom::Err::Error((input, ErrorKind::Tag)))
+                            Err(nom::Err::Error(NomError {
+                                input,
+                                code: ErrorKind::Tag,
+                            }))
                         }
                     }
                 } else {
@@ -633,7 +642,10 @@ impl MboxFormat {
                         }
                         Err(err) => {
                             debug!("Could not parse mail {:?}", err);
-                            Err(nom::Err::Error((input, ErrorKind::Tag)))
+                            Err(nom::Err::Error(NomError {
+                                input,
+                                code: ErrorKind::Tag,
+                            }))
                         }
                     }
                 }
@@ -724,7 +736,10 @@ pub fn mbox_parse(
     format: Option<MboxFormat>,
 ) -> IResult<&[u8], Vec<Envelope>> {
     if input.is_empty() {
-        return Err(nom::Err::Error((input, ErrorKind::Tag)));
+        return Err(nom::Err::Error(NomError {
+            input,
+            code: ErrorKind::Tag,
+        }));
     }
     let mut offset = 0;
     let mut index = index.lock().unwrap();
diff --git a/melib/src/email/parser.rs b/melib/src/email/parser.rs
index cf03a97f..6af3eb11 100644
--- a/melib/src/email/parser.rs
+++ b/melib/src/email/parser.rs
@@ -28,7 +28,7 @@ use nom::{
     combinator::peek,
     combinator::{map, opt},
     error::{context, ErrorKind},
-    multi::{many0, many1, separated_nonempty_list},
+    multi::{many0, many1, separated_list1},
     number::complete::le_u8,
     sequence::{delimited, pair, preceded, separated_pair, terminated},
 };
@@ -112,6 +112,17 @@ impl<I> nom::error::ParseError<I> for ParsingError<I> {
     }
 }
 
+impl<I, E> nom::error::FromExternalError<I, E> for ParsingError<I> {
+    fn from_external_error(input: I, kind: ErrorKind, _e: E) -> Self {
+        Self {
+            input,
+            error: kind.description().to_string().into(),
+        }
+    }
+}
+
+impl<I> nom::error::ContextError<I> for ParsingError<I> {}
+
 impl<'i> From<ParsingError<&'i [u8]>> for MeliError {
     fn from(val: ParsingError<&'i [u8]>) -> MeliError {
         MeliError::new("Parsing error").set_summary(format!(
@@ -155,6 +166,15 @@ impl<'i> From<nom::Err<ParsingError<&'i str>>> for MeliError {
     }
 }
 
+impl From<nom::Err<nom::error::Error<&[u8]>>> for MeliError {
+    fn from(val: nom::Err<nom::error::Error<&[u8]>>) -> MeliError {
+        match val {
+            nom::Err::Incomplete(_) => MeliError::new("Parsing Error: Incomplete"),
+            nom::Err::Error(_) | nom::Err::Failure(_) => MeliError::new("Parsing Error"),
+        }
+    }
+}
+
 macro_rules! is_ctl_or_space {
     ($var:ident) => {
         /* <any ASCII control character and DEL> */
@@ -1158,7 +1178,7 @@ pub mod mailing_lists {
     pub fn rfc_2369_list_headers_action_list(input: &[u8]) -> IResult<&[u8], Vec<&[u8]>> {
         let (input, _) = opt(cfws)(input)?;
         let (input, ret) = alt((
-            separated_nonempty_list(
+            separated_list1(
                 delimited(
                     map(opt(cfws), |_| ()),
                     map(is_a(", "), |_| ()),
@@ -1954,7 +1974,7 @@ pub mod encodings {
     }
 
     pub fn encoded_word_list(input: &[u8]) -> IResult<&[u8], SmallVec<[u8; 64]>> {
-        let (input, list) = separated_nonempty_list(space, encoded_word)(input)?;
+        let (input, list) = separated_list1(space, encoded_word)(input)?;
         let list_len = list.iter().fold(0, |mut acc, x| {
             acc += x.len();
             acc
diff --git a/src/command.rs b/src/command.rs
index a2342e49..8f8cede5 100644
--- a/src/command.rs
+++ b/src/command.rs
@@ -28,7 +28,8 @@ use melib::nom::{
     bytes::complete::{is_a, is_not, tag, take_until},
     character::complete::{digit1, not_line_ending},
     combinator::{map, map_res},
-    multi::separated_list,
+    error::Error as NomError,
+    multi::separated_list1,
     sequence::{pair, preceded, separated_pair},
     IResult,
 };
@@ -72,7 +73,10 @@ macro_rules! define_commands {
 
 pub fn quoted_argument(input: &[u8]) -> IResult<&[u8], &str> {
     if input.is_empty() {
-        return Err(nom::Err::Error((input, nom::error::ErrorKind::Tag)));
+        return Err(nom::Err::Error(NomError {
+            input,
+            code: nom::error::ErrorKind::Tag,
+        }));
     }
 
     if input[0] == b'"' {
@@ -85,7 +89,10 @@ pub fn quoted_argument(input: &[u8]) -> IResult<&[u8], &str> {
             }
             i += 1;
         }
-        Err(nom::Err::Error((input, nom::error::ErrorKind::Tag)))
+        Err(nom::Err::Error(NomError {
+            input,
+            code: nom::error::ErrorKind::Tag,
+        }))
     } else {
         map_res(is_not(" "), std::str::from_utf8)(input)
     }
@@ -243,7 +250,10 @@ fn eof(input: &[u8]) -> IResult<&[u8], ()> {
     if input.is_empty() {
         Ok((input, ()))
     } else {
-        Err(nom::Err::Error((input, nom::error::ErrorKind::Tag)))
+        Err(nom::Err::Error(NomError {
+            input,
+            code: nom::error::ErrorKind::Tag,
+        }))
     }
 }
 
@@ -502,7 +512,7 @@ define_commands!([
                                       let (input, _) = is_a(" ")(input)?;
                                       let (input, bin) = quoted_argument(input)?;
                                       let (input, _) = is_a(" ")(input)?;
-                                      let (input, args) = separated_list(is_a(" "), quoted_argument)(input)?;
+                                      let (input, args) = separated_list1(is_a(" "), quoted_argument)(input)?;
                                       let (input, _) = eof(input)?;
                                       Ok((input, {
                                           View(Pipe(bin.to_string(), args.into_iter().map(String::from).collect::<Vec<String>>()))
diff --git a/tools/src/mboxparse.rs b/tools/src/mboxparse.rs
index 0c861936..100018f6 100644
--- a/tools/src/mboxparse.rs
+++ b/tools/src/mboxparse.rs
@@ -51,7 +51,7 @@ fn main() -> Result<()> {
                 Err(melib::nom::Err::Error(err)) => {
                     println!(
                         "Error in parsing {:?}",
-                        unsafe { std::str::from_utf8_unchecked(err.0) }
+                        unsafe { std::str::from_utf8_unchecked(err.input) }
                             .chars()
                             .take(150)
                             .collect::<String>()