diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 37f9504..ea20d3f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -245,10 +245,6 @@ jobs:
             os: ubuntu-22.04
             install:
               - clang-15
-            sources:
-              - "deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy-15 main"
-            source_keys:
-              - "https://apt.llvm.org/llvm-snapshot.gpg.key"
           - toolset: clang
             compiler: clang++-15
             cxxstd: "03,11,14,17,20,2b"
@@ -257,10 +253,6 @@ jobs:
               - clang-15
               - libc++-15-dev
               - libc++abi-15-dev
-            sources:
-              - "deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy-15 main"
-            source_keys:
-              - "https://apt.llvm.org/llvm-snapshot.gpg.key"
             cxxflags: -stdlib=libc++
             linkflags: -stdlib=libc++
           - toolset: clang
@@ -279,16 +271,16 @@ jobs:
             linkflags: -stdlib=libc++
           - name: UBSAN
             toolset: clang
-            compiler: clang++-14
+            compiler: clang++-15
             cxxstd: "03,11,14,17,20,2b"
             cxxflags: -stdlib=libc++
             linkflags: -stdlib=libc++
             ubsan: 1
             os: ubuntu-22.04
             install:
-              - clang-14
-              - libc++-14-dev
-              - libc++abi-14-dev
+              - clang-15
+              - libc++-15-dev
+              - libc++abi-15-dev
 
           - toolset: clang
             cxxstd: "03,11,14,17,2a"