diff --git a/.cargo/audit.toml b/.cargo/audit.toml
new file mode 100644
index 0000000..8445275
--- /dev/null
+++ b/.cargo/audit.toml
@@ -0,0 +1,8 @@
+[advisories]
+ignore = [
+  # `proc-macro-error` is Unmaintained.
+  #
+  # Transitive dependency of `syn_derive`.
+  # Pending https://github.com/Kyuuhachi/syn_derive/issues/4.
+  "RUSTSEC-2024-0370",
+]
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 38744f3..a999b55 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,8 @@
 
 * Support inline images ([#33]).
 * Support `splines` in `GraphvizAttrs`.
+* Support `nodesep` in `GraphvizAttrs`.
+* Support `ranksep` in `GraphvizAttrs`.
 
 
 [#33]: https://github.com/azriel91/dot_ix/issues/33
diff --git a/Cargo.toml b/Cargo.toml
index 6885e3d..2e6fb66 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -62,12 +62,12 @@ dot_ix_static_check_macros = { version = "0.8.0", path = "crate/static_check_mac
 dot_ix_web_components = { version = "0.8.0", path = "crate/web_components" }
 
 # external crates
-axum = "0.7.5"
+axum = "0.7.6"
 console_error_panic_hook = "0.1"
 console_log = "1"
 cfg-if = "1"
 gloo-net = "0.6.0"
-indexmap = "2.4.0"
+indexmap = "2.5.0"
 indoc = "2.0.5"
 js-sys = "0.3.70"
 web-sys = "0.3.70"
@@ -75,23 +75,23 @@ leptos = { version = "0.6" }
 leptos_axum = "0.6"
 leptos_meta = { version = "0.6" }
 leptos_router = { version = "0.6" }
-leptos-use = "0.12.0"
+leptos-use = "0.13.5"
 log = "0.4"
 log4rs = { version = "1.3.0", default-features = false }
 monaco = "0.4.0"
-serde = "1.0.207"
+serde = "1.0.210"
 tempfile = "3.12.0"
-tokio = "1.39.2"
-tower = "0.5.0"
+tokio = "1.40.0"
+tower = "0.5.1"
 wasm-bindgen = "0.2.93"
 tailwind-css = "0.13.0"
-thiserror = "1.0.63"
+thiserror = "1.0.64"
 tracing = "0.1.40"
 http = "1.1.0"
 proc-macro2 = "1.0.86"
-quote = "1.0.36"
-reqwest = "0.12.5"
-syn = "2.0.74"
+quote = "1.0.37"
+reqwest = "0.12.7"
+syn = "2.0.77"
 serde_yaml = "0.9.34"
 
 [workspace.lints.rust]
diff --git a/crate/model/src/common/graphviz_attrs.rs b/crate/model/src/common/graphviz_attrs.rs
index 30af9a6..a3c62ce 100644
--- a/crate/model/src/common/graphviz_attrs.rs
+++ b/crate/model/src/common/graphviz_attrs.rs
@@ -17,6 +17,26 @@ mod splines;
 #[derive(Clone, Debug, PartialEq, Deserialize, Serialize)]
 #[serde(default)]
 pub struct GraphvizAttrs {
+    /// Minimum space between two adjacent nodes in the same rank, in
+    /// inches. Also controls the spacing between multiple edges between the
+    /// same pair of nodes.
+    ///
+    /// Defaults to `0.25`. Minimum `0.02`.
+    ///
+    /// See [`nodesep`].
+    ///
+    /// [`nodesep`]: https://graphviz.org/docs/attrs/nodesep/
+    pub nodesep: f64,
+    /// The desired separation between nodes of different ranks, in inches. See
+    /// [`ranksep`].
+    ///
+    /// Defaults to `0.25`. Minimum `0.02`.
+    ///
+    /// This does not support the `equally` string (yet). I'm not sure if it is
+    /// used.
+    ///
+    /// [`ranksep`]: https://graphviz.org/docs/attrs/ranksep/
+    pub ranksep: f64,
     /// How to render edge lines. See [`splines`].
     ///
     /// [`splines`]: https://graphviz.org/docs/attrs/splines/
@@ -55,6 +75,34 @@ impl GraphvizAttrs {
         Self::default()
     }
 
+    /// Sets the minimum space between two adjacent nodes in the same rank, in
+    /// inches. Also controls the spacing between multiple edges between the
+    /// same pair of nodes.
+    ///
+    /// Defaults to `0.25`. Minimum `0.02`.
+    ///
+    /// See [`nodesep`].
+    ///
+    /// [`nodesep`]: https://graphviz.org/docs/attrs/nodesep/
+    pub fn with_nodesep(mut self, nodesep: f64) -> Self {
+        self.nodesep = nodesep;
+        self
+    }
+
+    /// Sets the desired separation between nodes of different ranks, in inches.
+    /// See [`ranksep`].
+    ///
+    /// Defaults to `0.25`. Minimum `0.02`.
+    ///
+    /// This does not support the `equally` string (yet). I'm not sure if it is
+    /// used.
+    ///
+    /// [`ranksep`]: https://graphviz.org/docs/attrs/ranksep/
+    pub fn with_ranksep(mut self, ranksep: f64) -> Self {
+        self.ranksep = ranksep;
+        self
+    }
+
     /// Sets how to render edge lines. See [`splines`].
     ///
     /// [`splines`]: https://graphviz.org/docs/attrs/splines/
@@ -111,6 +159,29 @@ impl GraphvizAttrs {
         self
     }
 
+    /// Returns the minimum space between two adjacent nodes in the same rank,
+    /// in inches. Also controls the spacing between multiple edges between
+    /// the same pair of nodes.
+    ///
+    /// Defaults to `0.25`. Minimum `0.02`.
+    ///
+    /// See [`nodesep`].
+    ///
+    /// [`nodesep`]: https://graphviz.org/docs/attrs/nodesep/
+    pub fn nodesep(&self) -> f64 {
+        self.nodesep
+    }
+
+    /// Returns the desired separation between nodes of different ranks, in
+    /// inches. See [`ranksep`].
+    ///
+    /// Defaults to `0.25`. Minimum `0.02`.
+    ///
+    /// [`ranksep`]: https://graphviz.org/docs/attrs/ranksep/
+    pub fn ranksep(&self) -> f64 {
+        self.ranksep
+    }
+
     /// Returns how to render edge lines. See [`splines`].
     ///
     /// [`splines`]: https://graphviz.org/docs/attrs/splines/
@@ -164,6 +235,8 @@ impl GraphvizAttrs {
 impl Default for GraphvizAttrs {
     fn default() -> Self {
         Self {
+            nodesep: 0.25,
+            ranksep: 0.25,
             splines: Splines::default(),
             edge_constraint_default: true,
             edge_constraints: EdgeConstraints::default(),
diff --git a/crate/model/src/common/id_newtype.rs b/crate/model/src/common/id_newtype.rs
index 44d1a7c..c18c27d 100644
--- a/crate/model/src/common/id_newtype.rs
+++ b/crate/model/src/common/id_newtype.rs
@@ -44,7 +44,7 @@ macro_rules! id_newtype {
             /// compile time checks and returns a `const` value.
             ///
             #[doc = concat!("[`", stringify!($macro_name), "!`]: dot_ix_static_check_macros::profile")]
-            pub fn new(s: &'static str) -> Result<Self, $ty_err_name> {
+            pub fn new(s: &'static str) -> Result<Self, $ty_err_name<'static>> {
                 Self::try_from(s)
             }
 
diff --git a/crate/rt/src/into_graphviz_dot_src/info_graph.rs b/crate/rt/src/into_graphviz_dot_src/info_graph.rs
index 8d3cd76..cf49486 100644
--- a/crate/rt/src/into_graphviz_dot_src/info_graph.rs
+++ b/crate/rt/src/into_graphviz_dot_src/info_graph.rs
@@ -234,6 +234,8 @@ fn graph_attrs(
         GraphDir::Vertical => "TB",
     };
 
+    let nodesep = graphviz_attrs.nodesep();
+    let ranksep = graphviz_attrs.ranksep();
     let splines = graphviz_attrs.splines();
     let splines = match splines {
         Splines::Unset => Cow::Borrowed(""),
@@ -250,9 +252,8 @@ fn graph_attrs(
         compound  = true
         graph [
             margin    = 0.1
-            penwidth  = 0
-            nodesep   = 0.0
-            ranksep   = 0.02
+            nodesep   = {nodesep}
+            ranksep   = {ranksep}
             bgcolor   = "transparent"
             fontname  = "helvetica"
             packmode  = "{pack_mode}"
diff --git a/deny.toml b/deny.toml
index 4e52f3f..55cf7b9 100644
--- a/deny.toml
+++ b/deny.toml
@@ -70,7 +70,11 @@ yanked = "warn"
 # A list of advisory IDs to ignore. Note that ignored advisories will still
 # output a note when they are encountered.
 ignore = [
-    #"RUSTSEC-0000-0000",
+    # `proc-macro-error` is Unmaintained.
+    #
+    # Transitive dependency of `syn_derive`.
+    # Pending https://github.com/Kyuuhachi/syn_derive/issues/4.
+    "RUSTSEC-2024-0370",
 ]
 
 # If this is true, then cargo deny will use the git executable to fetch advisory database.
diff --git a/playground/Cargo.toml b/playground/Cargo.toml
index 03d8dbe..3b74e36 100644
--- a/playground/Cargo.toml
+++ b/playground/Cargo.toml
@@ -34,7 +34,7 @@ reqwest = { workspace = true, optional = true }
 serde = { workspace = true, features = ["derive"] }
 tokio = { workspace = true, optional = true }
 tower = { workspace = true, optional = true }
-tower-http = { version = "0.5", features = ["fs"], optional = true }
+tower-http = { version = "0.6", features = ["fs"], optional = true }
 tracing = { workspace = true, optional = true }
 http = { workspace = true }
 serde_yaml = { workspace = true }
diff --git a/rustfmt.toml b/rustfmt.toml
index b7e1fa5..008ee43 100644
--- a/rustfmt.toml
+++ b/rustfmt.toml
@@ -4,4 +4,4 @@ use_field_init_shorthand = true
 format_code_in_doc_comments = true
 wrap_comments = true
 edition = "2021"
-version = "Two"
+style_edition = "2021"