diff --git a/.cirrus.yml b/.cirrus.yml
index 9c07f783cf4..5b42d9b306b 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -205,7 +205,7 @@ install_ubuntu_prerequisites_template: &INSTALL_UBUNTU_PREREQUISITES_TEMPLATE
 environment:
   CIRRUS_CLONE_DEPTH: 50
   HOST_LDC_VERSION: 1.31.0
-  LLVM_VERSION: 18.1.4
+  LLVM_VERSION: 18.1.5
   GITHUB_TOKEN: ENCRYPTED[0955bd48c8d4e5391446fc0149d0719ad0b63df27ec9e6c180a5730a5b10dc7f28f09d1383423db158d21380ee2b022a]
 
 task:
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index c0ff7604445..4829c80e35a 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -11,7 +11,7 @@ concurrency:
 
 env:
   CLANG_VERSION: 15.0.6
-  LLVM_VERSION: 18.1.4
+  LLVM_VERSION: 18.1.5
 
 jobs:
   build-native:
@@ -85,7 +85,7 @@ jobs:
       - name: Install prerequisites
         uses: ./.github/actions/1-setup
         with:
-          clang_version: ${{ runner.os == 'Windows' && '18.1.3' || env.CLANG_VERSION }}
+          clang_version: ${{ runner.os == 'Windows' && '18.1.5' || env.CLANG_VERSION }}
           llvm_version: ${{ env.LLVM_VERSION }}
           arch: ${{ matrix.arch }}
       - name: Build bootstrap LDC
diff --git a/.github/workflows/supported_llvm_versions.yml b/.github/workflows/supported_llvm_versions.yml
index 5b717d62362..9d784a8b639 100644
--- a/.github/workflows/supported_llvm_versions.yml
+++ b/.github/workflows/supported_llvm_versions.yml
@@ -19,7 +19,7 @@ jobs:
             os: ubuntu-20.04
             host_dc: ldc-beta
             # FIXME: no usable official package available yet
-            llvm_version: https://github.com/ldc-developers/llvm-project/releases/download/ldc-v18.1.4/llvm-18.1.4-linux-x86_64.tar.xz
+            llvm_version: https://github.com/ldc-developers/llvm-project/releases/download/ldc-v18.1.5/llvm-18.1.5-linux-x86_64.tar.xz
           - job_name: macOS 14, LLVM 17, latest LDC beta
             os: macos-14
             host_dc: ldc-beta
diff --git a/CHANGELOG.md b/CHANGELOG.md
index f7eea822782..d92c74e190d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,7 +2,7 @@
 
 #### Big news
 - Frontend, druntime and Phobos are at version [2.108.1](https://dlang.org/changelog/2.108.0.html). (#4591, #4615, #4619, #4622, #4623, #4640)
-- Support for [LLVM 18](https://releases.llvm.org/18.1.0/docs/ReleaseNotes.html). The prebuilt packages use v18.1.4 (except for macOS arm64). (#4599, #4605, #4607, #4604, #4628)
+- Support for [LLVM 18](https://releases.llvm.org/18.1.0/docs/ReleaseNotes.html). The prebuilt packages use v18.1.5 (except for macOS arm64). (#4599, #4605, #4607, #4604, #4628, #4642)
 - Android: Switch to native ELF TLS, supported since API level 29 (Android v10), dropping our former custom TLS emulation (requiring a modified LLVM and a legacy ld.bfd linker). The prebuilt packages themselves require Android v10+ (armv7a) / v11+ (aarch64) too, and are built with NDK r26d. Shared druntime and Phobos libraries are now available (`-link-defaultlib-shared`), as on regular Linux. (#4618)
 
 #### Platform support