diff --git a/.github/workflows/fuzz.yml b/.github/workflows/fuzz.yml
index 7b39766..b54d3ac 100644
--- a/.github/workflows/fuzz.yml
+++ b/.github/workflows/fuzz.yml
@@ -88,7 +88,7 @@ jobs:
               - "https://apt.llvm.org/llvm-snapshot.gpg.key"
           - toolset: clang
             compiler: clang++-18
-            cxxstd: "14,17,20,23"
+            cxxstd: "14,17,20"
             os: ubuntu-24.04
             install:
               - clang-18
@@ -98,7 +98,7 @@ jobs:
               - "https://apt.llvm.org/llvm-snapshot.gpg.key"
           - toolset: clang
             compiler: clang++-19
-            cxxstd: "14,17,20,23"
+            cxxstd: "14,17,20"
             os: ubuntu-24.04
             install:
               - clang-19