diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 233d4f81..b0bed266 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -112,7 +112,7 @@ jobs:
             compiler: clang++-9
             cxxstd: "11,14,17,2a"
             os: ubuntu-20.04
-            supported: true
+            supported: "Causes segfault on GHA CI, not on official image"
           - toolset: clang
             install: clang-10
             compiler: clang++-10
diff --git a/CHANGELOG.md b/CHANGELOG.md
index dc8f5122..247b5fe0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,4 @@
+* Disable GHA CI for clang-9.
 * Update example root certificates.
 
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