diff --git a/schala-repl/src/lib.rs b/schala-repl/src/lib.rs
index 2e02d41..579d811 100644
--- a/schala-repl/src/lib.rs
+++ b/schala-repl/src/lib.rs
@@ -51,7 +51,7 @@ pub fn start_repl(langs: Vec<Box<dyn ProgrammingLanguageInterface>>) {
   };
 }
 
-fn run_noninteractive(filename: &str, languages: Vec<Box<ProgrammingLanguageInterface>>) {
+fn run_noninteractive(filename: &str, languages: Vec<Box<dyn ProgrammingLanguageInterface>>) {
   let path = Path::new(filename);
   let ext = path.extension().and_then(|e| e.to_str()).unwrap_or_else(|| {
     println!("Source file lacks extension");
diff --git a/schala-repl/src/repl/mod.rs b/schala-repl/src/repl/mod.rs
index 32c339a..3e03358 100644
--- a/schala-repl/src/repl/mod.rs
+++ b/schala-repl/src/repl/mod.rs
@@ -23,12 +23,12 @@ type InterpreterDirectiveOutput = Option<String>;
 pub struct Repl {
   pub interpreter_directive_sigil: char,
   line_reader: ::linefeed::interface::Interface<::linefeed::terminal::DefaultTerminal>,
-  language_states: Vec<Box<ProgrammingLanguageInterface>>,
+  language_states: Vec<Box<dyn ProgrammingLanguageInterface>>,
   options: ReplOptions,
 }
 
 impl Repl {
-  pub fn new(initial_states: Vec<Box<ProgrammingLanguageInterface>>) -> Repl {
+  pub fn new(initial_states: Vec<Box<dyn ProgrammingLanguageInterface>>) -> Repl {
     use linefeed::Interface;
     let line_reader = Interface::new("schala-repl").unwrap();
     let interpreter_directive_sigil = ':';
@@ -113,7 +113,7 @@ impl Repl {
     directives.perform(self, &arguments)
   }
 
-  fn get_cur_language_state(&mut self) -> &mut Box<ProgrammingLanguageInterface> {
+  fn get_cur_language_state(&mut self) -> &mut Box<dyn ProgrammingLanguageInterface> {
     //TODO this is obviously not complete
     &mut self.language_states[0]
   }
diff --git a/src/main.rs b/src/main.rs
index 231d7fa..beb792a 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -9,7 +9,7 @@ use schala_repl::{ProgrammingLanguageInterface, start_repl};
 extern { }
 
 fn main() {
-  let langs: Vec<Box<ProgrammingLanguageInterface>> = vec![Box::new(schala_lang::Schala::new())];
+  let langs: Vec<Box<dyn ProgrammingLanguageInterface>> = vec![Box::new(schala_lang::Schala::new())];
   start_repl(langs);
 }