diff --git a/.docker/docker-qgis-clangtidy.sh b/.docker/docker-qgis-clangtidy.sh
index f15c53f9a0e..bc0c50f0aa3 100755
--- a/.docker/docker-qgis-clangtidy.sh
+++ b/.docker/docker-qgis-clangtidy.sh
@@ -23,15 +23,17 @@ cd ${SRCDIR}
 # https://github.com/qgis/QGIS/runs/6733585841?check_suite_focus=true#step:13:89
 git config --global --add safe.directory ${SRCDIR}
 
+# The clang-tidy version installed needs to match the one used to compile QGIS.
+# Otherwise, it will not be able to inspect the modified files.
 echo "::group::Install clang tidy"
 apt install -y \
-    clang-tidy
+    clang-tidy-15
 echo "::endgroup::"
 
 cd ${SRCDIR}
 
 echo "::group::Download clang-tidy-diff"
-curl -XGET https://raw.githubusercontent.com/llvm/llvm-project/llvmorg-14.0.6/clang-tools-extra/clang-tidy/tool/clang-tidy-diff.py -o clang-tidy-diff.py
+curl -XGET https://raw.githubusercontent.com/llvm/llvm-project/llvmorg-15.0.7/clang-tools-extra/clang-tidy/tool/clang-tidy-diff.py -o clang-tidy-diff.py
 echo "::endgroup::"
 
 echo "${bold}Disable unity build...${endbold}"
@@ -42,7 +44,7 @@ echo "${bold}Run clang-tidy on modifications...${endbold}"
 # We need to add build/src/test dir as extra include directories because when clang-tidy tries to process qgstest.h
 # it has no compile_commands.json instructions to know what are include directories
 # It manages to figure out for other headers though, I don't get how...
-git diff -U0 HEAD^ | python3 clang-tidy-diff.py -p1 -path=${CTEST_BUILD_DIR} -use-color -extra-arg=-I${CTEST_BUILD_DIR}/src/test/ | tee clang-tidy.log
+git diff -U0 HEAD^ | python3 clang-tidy-diff.py -p1 -path=${CTEST_BUILD_DIR} -use-color -extra-arg=-I${CTEST_BUILD_DIR}/src/test/ -clang-tidy-binary /usr/bin/clang-tidy-15 | tee clang-tidy.log
 
 echo -e "\e[1;34mTo reproduce locally:"
 echo -e "\e[1;34m - launch cmake with option -DCMAKE_EXPORT_COMPILE_COMMANDS=ON"