diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 3ec1bf7f..59bd82f8 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -89,7 +89,7 @@ jobs:
     strategy:
       matrix:
         os: [macOS-latest, ubuntu-latest, windows-latest]
-        version: [stable, nightly, "1.74"]
+        version: [stable, nightly, "1.78"]
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v4
diff --git a/Cargo.toml b/Cargo.toml
index 22587b6d..122ab44b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,7 +9,7 @@ repository = "https://github.com/sourcefrog/cargo-mutants"
 homepage = "https://mutants.rs/"
 categories = ["development-tools::testing"]
 keywords = ["testing", "mutants", "cargo", "mutation-testing", "coverage"]
-rust-version = "1.74"
+rust-version = "1.78"
 
 [package.metadata.wix]
 upgrade-guid = "CA7BFE8D-F3A7-4D1D-AE43-B7749110FA90"