diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 81b07d4..0fbd4dc 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,7 +11,7 @@ jobs:
     strategy:
       matrix:
         os: ["macos-latest", "ubuntu-latest", "windows-latest"]
-        rust: ["beta", "stable"]
+        rust: ["1.56", "beta", "stable"]
 
     runs-on: ${{ matrix.os }}
 
diff --git a/src/lib.rs b/src/lib.rs
index 8118277..6a3b098 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -40,7 +40,7 @@ impl Display for StrSimError {
             StrSimError::DifferentLengthArgs => "Differing length arguments provided",
         };
 
-        write!(fmt, "{text}")
+        write!(fmt, "{}", text)
     }
 }