diff --git a/.github/workflows/build-classic.yml b/.github/workflows/build-classic.yml
index b92ccda..436b675 100644
--- a/.github/workflows/build-classic.yml
+++ b/.github/workflows/build-classic.yml
@@ -24,7 +24,7 @@ jobs:
 
       matrix:
         gcc_version: [ '4.8.5' ]
-        cmake_version: [ '3.29.6' ]
+        cmake_version: [ '3.9.6' ]
         build_type: [ Release ]
 
     name: "In Container GCC ${{matrix.gcc_version}} ${{matrix.build_type}}"