diff --git a/searx/settings.yml b/searx/settings.yml
index 539049ea0..d9a1f45f0 100644
--- a/searx/settings.yml
+++ b/searx/settings.yml
@@ -463,7 +463,7 @@ engines:
   - name : openairedatasets
     engine : json_engine
     paging : True
-    search_url : http://api.openaire.eu/search/datasets?format=json&page={pageno}&size=10&title={query}
+    search_url : https://api.openaire.eu/search/datasets?format=json&page={pageno}&size=10&title={query}
     results_query : response/results/result
     url_query : metadata/oaf:entity/oaf:result/children/instance/webresource/url/$
     title_query : metadata/oaf:entity/oaf:result/title/$
@@ -475,7 +475,7 @@ engines:
   - name : openairepublications
     engine : json_engine
     paging : True
-    search_url : http://api.openaire.eu/search/publications?format=json&page={pageno}&size=10&title={query}
+    search_url : https://api.openaire.eu/search/publications?format=json&page={pageno}&size=10&title={query}
     results_query : response/results/result
     url_query : metadata/oaf:entity/oaf:result/children/instance/webresource/url/$
     title_query : metadata/oaf:entity/oaf:result/title/$
@@ -806,7 +806,7 @@ locales:
 doi_resolvers :
   oadoi.org : 'https://oadoi.org/'
   doi.org : 'https://doi.org/'
-  doai.io  : 'http://doai.io/'
-  sci-hub.tw : 'http://sci-hub.tw/'
+  doai.io  : 'https://doai.io/'
+  sci-hub.tw : 'https://sci-hub.tw/'
 
 default_doi_resolver : 'oadoi.org'
diff --git a/searx/settings_robot.yml b/searx/settings_robot.yml
index 635809041..25f229e56 100644
--- a/searx/settings_robot.yml
+++ b/searx/settings_robot.yml
@@ -43,7 +43,7 @@ locales:
 doi_resolvers :
   oadoi.org : 'https://oadoi.org/'
   doi.org : 'https://doi.org/'
-  doai.io  : 'http://doai.io/'
-  sci-hub.tw : 'http://sci-hub.tw/'
+  doai.io  : 'https://doai.io/'
+  sci-hub.tw : 'https://sci-hub.tw/'
 
 default_doi_resolver : 'oadoi.org'