diff --git a/.travis.yml b/.travis.yml
index 2d377e8..e027dcb 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,24 +7,24 @@ rust:
 matrix:
   include:
   - env: RUSTFMT
-    rust: 1.35.0  # `stable`: Locking down for consistent behavior
+    rust: 1.38.0  # `stable`: Locking down for consistent behavior
     install:
       - rustup component add rustfmt
     script:
       - cargo fmt --all -- --check
   - env: CodeGen
-    rust: 1.35.0  # `stable`: Locking down for consistent behavior
+    rust: 1.38.0  # `stable`: Locking down for consistent behavior
     install:
     - rustup component add rustfmt
     script:
     - cargo run --package typos-codegen -- --input typos-dict/assets/words.csv --output typos-dict/src/dict_codegen.rs --check
   - env: RUSTFLAGS="-D warnings"
-    rust: 1.35.0  # `stable`: Locking down for consistent behavior
+    rust: 1.38.0  # `stable`: Locking down for consistent behavior
     install:
     script:
     - cargo check --tests --all
   - env: CLIPPY
-    rust: 1.35.0  # `stable`: Locking down for consistent behavior
+    rust: 1.38.0  # `stable`: Locking down for consistent behavior
     install:
       - rustup component add clippy
     script:
diff --git a/typos/src/checks.rs b/typos/src/checks.rs
index 3941887..591fdae 100644
--- a/typos/src/checks.rs
+++ b/typos/src/checks.rs
@@ -36,7 +36,7 @@ impl CheckSettings {
 
     pub fn build<'d, 'p>(
         &self,
-        dictionary: &'d Dictionary,
+        dictionary: &'d dyn Dictionary,
         parser: &'p tokens::Parser,
     ) -> Checks<'d, 'p> {
         Checks {
@@ -61,7 +61,7 @@ impl Default for CheckSettings {
 
 #[derive(Clone)]
 pub struct Checks<'d, 'p> {
-    dictionary: &'d Dictionary,
+    dictionary: &'d dyn Dictionary,
     parser: &'p tokens::Parser,
     check_filenames: bool,
     check_files: bool,