diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 791979e..79d7f5f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -7,14 +7,14 @@ on:
 jobs:
   build-linux:
     runs-on: ubuntu-latest
-    container: swiftlang/swift:nightly-main-jammy
+    container: swiftlang/swift:nightly-6.1-jammy
     steps:
       - uses: actions/checkout@v4
       - run: apt-get update && apt-get install --no-install-recommends -y make llvm-14
       - run: make OBJCOPY=llvm-objcopy-14
   lint:
     runs-on: ubuntu-latest
-    container: swiftlang/swift:nightly-main-jammy
+    container: swiftlang/swift:nightly-6.1-jammy
     steps:
       - uses: actions/checkout@v4
       - run: swift format lint -rsp .