diff --git a/llvm.spec b/llvm.spec
index f9d99d20985..ac0b0f434b2 100644
--- a/llvm.spec
+++ b/llvm.spec
@@ -1,4 +1,4 @@
-### RPM external llvm 16.0.3
+### RPM external llvm 17.0.3
 ## INITENV +PATH LD_LIBRARY_PATH %{i}/lib64
 ## INITENV +PATH PYTHON3PATH %{i}/lib64/python%{cms_python3_major_minor_version}/site-packages
 
@@ -6,9 +6,9 @@ BuildRequires: cmake ninja
 Requires: gcc zlib python3
 Requires: cuda
 
-%define llvmCommit 8d7c2f5a53d88d769afb6b46f42bcbd8353014d0
-%define llvmBranch cms/release/16.x/464bda7
-%define iwyuCommit 14e9b208914a84fcdf49bf9f5d08897a4b3dc4b8
+%define llvmCommit 83204dfcd4277154e46a5c6094aee389a7f260e8
+%define llvmBranch cms/release/17.x/afbe354
+%define iwyuCommit db886395c3884c4e7d948746b2a9e845b507c200
 %define iwyuBranch master
 
 Source0: git+https://github.com/cms-externals/llvm-project.git?obj=%{llvmBranch}/%{llvmCommit}&export=llvm-%{realversion}-%{llvmCommit}&module=llvm-%{realversion}-%{llvmCommit}&output=/llvm-%{realversion}-%{llvmCommit}.tgz