diff --git a/Cargo.lock b/Cargo.lock
index b620f0d..3c4ec6b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -88,7 +88,7 @@ version = "0.1.0"
 dependencies = [
  "anyhow",
  "aoc",
- "bitvec 0.22.3",
+ "bitvec",
  "rand",
 ]
 
@@ -100,12 +100,6 @@ dependencies = [
  "criterion",
 ]
 
-[[package]]
-name = "arrayvec"
-version = "0.5.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "23b62fc65de8e4e7f52534fb52b0f3ed04746ae267519eef2a83941e8085068b"
-
 [[package]]
 name = "atty"
 version = "0.2.14"
@@ -129,18 +123,6 @@ version = "1.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
 
-[[package]]
-name = "bitvec"
-version = "0.19.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a7ba35e9565969edb811639dbebfe34edc0368e472c5018474c8eb2543397f81"
-dependencies = [
- "funty",
- "radium 0.5.3",
- "tap",
- "wyz 0.2.0",
-]
-
 [[package]]
 name = "bitvec"
 version = "0.22.3"
@@ -148,9 +130,9 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5237f00a8c86130a0cc317830e558b966dd7850d48a953d998c813f01a41b527"
 dependencies = [
  "funty",
- "radium 0.6.2",
+ "radium",
  "tap",
- "wyz 0.4.0",
+ "wyz",
 ]
 
 [[package]]
@@ -427,19 +409,6 @@ version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
 
-[[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",
- "ryu",
- "static_assertions",
-]
-
 [[package]]
 name = "libc"
 version = "0.2.108"
@@ -482,14 +451,19 @@ dependencies = [
 ]
 
 [[package]]
-name = "nom"
-version = "6.1.1"
+name = "minimal-lexical"
+version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3d521ee2250f619dd5e06515ba405858d249edc8fae9ddee2dba0695e57db01b"
+checksum = "68354c5c6bd36d73ff3feceb05efa59b6acb7626617f4962be322a825e61f79a"
+
+[[package]]
+name = "nom"
+version = "7.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1b1d11e1ef389c76fe5b81bcaf2ea32cf88b62bc494e19f493d0b30e7a930109"
 dependencies = [
- "bitvec 0.19.4",
- "lexical-core",
  "memchr",
+ "minimal-lexical",
  "version_check",
 ]
 
@@ -576,12 +550,6 @@ dependencies = [
  "proc-macro2",
 ]
 
-[[package]]
-name = "radium"
-version = "0.5.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "941ba9d78d8e2f7ce474c015eea4d9c6d25b6a3327f9832ee29a4de27f91bbb8"
-
 [[package]]
 name = "radium"
 version = "0.6.2"
@@ -748,12 +716,6 @@ dependencies = [
  "serde",
 ]
 
-[[package]]
-name = "static_assertions"
-version = "1.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a2eb9349b6444b326872e140eb1cf5e7c522154d69e7a0ffb0fb81c06b37543f"
-
 [[package]]
 name = "syn"
 version = "1.0.82"
@@ -926,12 +888,6 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
 
-[[package]]
-name = "wyz"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "85e60b0d1b5f99db2556934e21937020776a5d31520bf169e851ac44e6420214"
-
 [[package]]
 name = "wyz"
 version = "0.4.0"
diff --git a/aoc2020/Cargo.toml b/aoc2020/Cargo.toml
index c42c975..10346de 100644
--- a/aoc2020/Cargo.toml
+++ b/aoc2020/Cargo.toml
@@ -10,7 +10,7 @@ edition = "2021"
 aoc = { path = "../aoc" }
 anyhow = "1.0"
 itertools = "0.9"
-nom = "6.0"
+nom = "7.0"
 
 [lib]
 path = "src/lib.rs"
diff --git a/aoc2020/src/day18.rs b/aoc2020/src/day18.rs
index 12df6fe..4df8254 100644
--- a/aoc2020/src/day18.rs
+++ b/aoc2020/src/day18.rs
@@ -84,7 +84,7 @@ fn operator_expr(input: &str) -> IResult<&str, Expr> {
 
     fold_many0(
         pair(delimited(char(' '), operator, char(' ')), term),
-        first_term,
+        move || first_term.clone(),
         |acc, (op, val)| Expr::Op(Box::new(acc), op, Box::new(val)),
     )(i)
 }
@@ -97,7 +97,7 @@ fn plus(input: &str) -> IResult<&str, Expr> {
             delimited(char(' '), char('+'), char(' ')),
             term_plus_priority,
         ),
-        first_term,
+        move || first_term.clone(),
         |acc, (_, val)| Expr::Op(Box::new(acc), Operator::Addition, Box::new(val)),
     )(i)
 }
@@ -107,7 +107,7 @@ fn mul(input: &str) -> IResult<&str, Expr> {
 
     fold_many0(
         pair(delimited(char(' '), char('*'), char(' ')), plus),
-        first_factor,
+        move || first_factor.clone(),
         |acc, (_, val)| Expr::Op(Box::new(acc), Operator::Multiplication, Box::new(val)),
     )(i)
 }