diff --git a/.readthedocs.yml b/.readthedocs.yml
index 80edfea..62006ea 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -8,7 +8,7 @@ sphinx:
 
 # build
 python:
-  version: "3.7"
+  version: "3.9"
   install:
     - method: pip
       path: .
diff --git a/.travis.yml b/.travis.yml
index 29dd0ae..3123a71 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -10,13 +10,13 @@ matrix:
 
         - python: '3.7'
           env:
-            - COVERAGE="true"
 
         - python: '3.8'
           env:
 
         - python: '3.9'
           env:
+            - COVERAGE="true"
 
         - python: '3.10'
           env:
diff --git a/docs/Makefile b/docs/Makefile
index c6f8ee0..3853655 100644
--- a/docs/Makefile
+++ b/docs/Makefile
@@ -24,5 +24,5 @@ html:
 	$(SPHINXBUILD) -b html $(ALLSPHINXOPTS) $(BUILDDIR)
 	-rm -f $(BUILDDIR)/../../scripts/_*py
 	-rm -f $(BUILDDIR)/../../scripts/_*pyc
-	-rm -f $(BUILDDIR)/../../scripts/__pycache__
+	-rm -rf $(BUILDDIR)/../../scripts/__pycache__