diff --git a/Cargo.toml b/Cargo.toml
index 87e1684..f465249 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,7 +13,7 @@ keywords = ["dependency", "parser", "pep508", "python", "requirements"]
 categories = ["parser-implementations"]
 
 [dependencies]
-chumsky = ">=1.0.0-alpha.3"
+chumsky = "=1.0.0-alpha.6"
 
 [dev-dependencies]
-insta = "1.28.0"
+insta = "1.34.0"
diff --git a/src/lib.rs b/src/lib.rs
index 06c1d13..ee9f4a3 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -149,7 +149,7 @@ pub fn parser<'a, E: Error<'a, &'a str> + 'a>(
                 .then(any().filter(char::is_ascii_alphanumeric))
                 .repeated(),
         )
-        .slice();
+        .to_slice();
 
     let cmp = choice((
         just("===").to(Comparator::Ae),
@@ -170,7 +170,7 @@ pub fn parser<'a, E: Error<'a, &'a str> + 'a>(
             )
             .repeated()
             .at_least(1)
-            .slice(),
+            .to_slice(),
         )
         .map(|(comparator, version)| VersionSpec {
             comparator,
@@ -215,11 +215,11 @@ pub fn parser<'a, E: Error<'a, &'a str> + 'a>(
 
                 let marker_var = choice((
                     just('\'')
-                        .ignore_then(set!(c!() | '"').repeated().slice())
+                        .ignore_then(set!(c!() | '"').repeated().to_slice())
                         .then_ignore(just('\''))
                         .map(Variable::String),
                     just('"')
-                        .ignore_then(set!(c!() | '\'').repeated().slice())
+                        .ignore_then(set!(c!() | '\'').repeated().to_slice())
                         .then_ignore(just('"'))
                         .map(Variable::String),
                     just("python_version").to(Variable::PythonVersion),
diff --git a/src/url.rs b/src/url.rs
index 055416a..f3acf4b 100644
--- a/src/url.rs
+++ b/src/url.rs
@@ -139,7 +139,7 @@ pub(crate) fn parser<'a, E: Error<'a, &'a str> + 'a>(
             .ignored(),
     ))
     .then(frags)
-    .slice()
+    .to_slice()
 }
 
 #[cfg(test)]