diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index bbd2096fe..f51372140 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -5,12 +5,12 @@ sphinx:
   builder: html
 
 build:
-  os: "ubuntu-24.04"
+  os: "ubuntu-22.04"
   tools:
     python: "3.11"
   apt_packages:
-    - clang-18
+    - clang-13
     - cmake
-    - libclang-18-dev
-    - llvm-18-dev
-    - llvm-18-tools
\ No newline at end of file
+    - libclang-13-dev
+    - llvm-13-dev
+    - llvm-13-tools
\ No newline at end of file
diff --git a/docs/conf.py b/docs/conf.py
index 215c714f5..78ced181f 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -50,8 +50,8 @@
 html_extra_path = [CPPINTEROP_ROOT + '/build/docs/']
 
 import subprocess
-command = 'mkdir {0}/build; cd {0}/build; cmake ../ -DClang_DIR=/usr/lib/llvm-18/lib/cmake/clang \
-         -DLLVM_DIR=/usr/lib/llvm-18/lib/cmake/llvm -DCPPINTEROP_ENABLE_DOXYGEN=ON \
+command = 'mkdir {0}/build; cd {0}/build; cmake ../ -DClang_DIR=/usr/lib/llvm-13/build/lib/cmake/clang\
+         -DLLVM_DIR=/usr/lib/llvm-13/build/lib/cmake/llvm -DCPPINTEROP_ENABLE_DOXYGEN=ON\
          -DCPPINTEROP_INCLUDE_DOCS=ON'.format(CPPINTEROP_ROOT)
 subprocess.call(command, shell=True)
 subprocess.call('doxygen {0}/build/docs/doxygen.cfg'.format(CPPINTEROP_ROOT), shell=True)
\ No newline at end of file