diff --git a/Cargo.lock b/Cargo.lock
index c3e39d8..477a84e 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -388,9 +388,9 @@ dependencies = [
 
 [[package]]
 name = "pulldown-cmark-to-cmark"
-version = "9.0.0"
+version = "10.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3f94dc756ef5c50ad28ccea8428ba5de9f4dca1fff6516a26b85e0b125a70d17"
+checksum = "0194e6e1966c23cc5fd988714f85b18d548d773e81965413555d96569931833d"
 dependencies = [
  "pulldown-cmark",
 ]
@@ -578,9 +578,9 @@ dependencies = [
 
 [[package]]
 name = "unicode-width"
-version = "0.1.9"
+version = "0.1.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3ed742d4ea2bd1176e236172c8429aaf54486e7ac098db29ffe6529e0ce50973"
+checksum = "c0edd1e5b14653f783770bce4a4dabb4a5108a5370a5f5d8cfe8710c361f6c8b"
 
 [[package]]
 name = "unicode-xid"
diff --git a/Cargo.toml b/Cargo.toml
index f577ade..070680a 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -33,7 +33,7 @@ matter = "0.1.0-alpha4"
 pathdiff = "0.2.1"
 percent-encoding = "2.2.0"
 pulldown-cmark = "0.9.2"
-pulldown-cmark-to-cmark = "9.0.0"
+pulldown-cmark-to-cmark = "10.0.4"
 rayon = "1.5.3"
 regex = "1.6.0"
 serde_yaml = "0.9.14"
diff --git a/src/lib.rs b/src/lib.rs
index f6fdcbd..c9cb34e 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -730,7 +730,6 @@ fn render_mdevents_to_mdtext(markdown: MarkdownEvents) -> String {
     cmark_with_options(
         markdown.iter(),
         &mut buffer,
-        None,
         pulldown_cmark_to_cmark::Options::default(),
     )
     .expect("formatting to string not expected to fail");