diff --git a/Cargo.lock b/Cargo.lock
index 5184b7b26..9405c0a4d 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -15,9 +15,9 @@ dependencies = [
 
 [[package]]
 name = "aho-corasick"
-version = "0.7.19"
+version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b4f55bd91a0978cbfd91c457a164bab8b4001c833b7f323132c0a4e1922dd44e"
+checksum = "67fc08ce920c31afb70f013dcce1bfc3a3195de6a228474e45e1f145b36f8d04"
 dependencies = [
  "memchr",
 ]
@@ -1501,13 +1501,13 @@ dependencies = [
 
 [[package]]
 name = "regex"
-version = "1.7.3"
+version = "1.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8b1f693b24f6ac912f4893ef08244d70b6067480d2f1a46e950c9691e6749d1d"
+checksum = "af83e617f331cc6ae2da5443c602dfa5af81e517212d9d611a5b3ba1777b5370"
 dependencies = [
  "aho-corasick",
  "memchr",
- "regex-syntax",
+ "regex-syntax 0.7.1",
 ]
 
 [[package]]
@@ -1516,7 +1516,7 @@ version = "0.1.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6c230d73fb8d8c1b9c0b3135c5142a8acee3a0558fb8db5cf1cb65f8d7862132"
 dependencies = [
- "regex-syntax",
+ "regex-syntax 0.6.29",
 ]
 
 [[package]]
@@ -1525,6 +1525,12 @@ version = "0.6.29"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f162c6dd7b008981e4d40210aca20b4bd0f9b60ca9271061b07f78537722f2e1"
 
+[[package]]
+name = "regex-syntax"
+version = "0.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a5996294f19bd3aae0453a862ad728f60e6600695733dd5df01da90c54363a3c"
+
 [[package]]
 name = "roff"
 version = "0.2.1"
diff --git a/lib/src/diff.rs b/lib/src/diff.rs
index 06ae6e4ec..9e3e62f30 100644
--- a/lib/src/diff.rs
+++ b/lib/src/diff.rs
@@ -635,9 +635,15 @@ pub fn diff<'a>(left: &'a [u8], right: &'a [u8]) -> Vec<DiffHunk<'a>> {
 mod tests {
     use super::*;
 
+    // Extracted to a function because type inference is ambiguous due to
+    // `impl PartialEq<aho_corasick::util::search::Span> for std::ops::Range<usize>`
+    fn no_ranges() -> Vec<Range<usize>> {
+        vec![]
+    }
+
     #[test]
     fn test_find_line_ranges_empty() {
-        assert_eq!(find_line_ranges(b""), vec![]);
+        assert_eq!(find_line_ranges(b""), no_ranges());
     }
 
     #[test]
@@ -657,7 +663,7 @@ mod tests {
 
     #[test]
     fn test_find_word_ranges_empty() {
-        assert_eq!(find_word_ranges(b""), vec![]);
+        assert_eq!(find_word_ranges(b""), no_ranges());
     }
 
     #[test]
@@ -667,7 +673,7 @@ mod tests {
 
     #[test]
     fn test_find_word_ranges_no_word() {
-        assert_eq!(find_word_ranges(b"+-*/"), vec![]);
+        assert_eq!(find_word_ranges(b"+-*/"), no_ranges());
     }
 
     #[test]