diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index c06216607e7d5fcb4cca24413fe252e34c31e1e6..9ba4edd7f29e1f46a6611a7ddeb47fd07977b724 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -18,7 +18,7 @@ build_docs:
   stage: build
   script:
     - cd docs
-    - make html
+    - pyenv local 3.6.3 && make html
     - CI_LATEST_OUTPUT_PATH=/mace-build-output/$CI_PROJECT_NAME/latest
     - CI_JOB_OUTPUT_PATH=/mace-build-output/$CI_PROJECT_NAME/$CI_PIPELINE_ID
     - rm -rf $CI_JOB_OUTPUT_PATH
diff --git a/docs/Makefile b/docs/Makefile
index 10559b41b6b92c00e4a7b6785d6fa987e0c7518e..f4fa89c6fc7798b4df898f6510b7e4a558fc7279 100644
--- a/docs/Makefile
+++ b/docs/Makefile
@@ -17,5 +17,4 @@ help:
 # Catch-all target: route all unknown targets to Sphinx using the new
 # "make mode" option.  $(O) is meant as a shortcut for $(SPHINXOPTS).
 %: Makefile
-	pyenv local 3.6.3
 	@$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)