diff --git a/docs/conf.py b/docs/conf.py
index d710bdd..d2725ad 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -293,7 +293,7 @@ texinfo_documents = [
 
 #-- Options for extlink extension
 extlinks = {'issue': ('https://github.com/miurahr/aqtinstall/issues/%s',
-                      'issue ')}
+                      'issue %s')}
 
 #-- Options for linkcheck
 linkcheck_ignore = [r'https://github.com/miurahr/aqtinstall/compare/.+',
diff --git a/pyproject.toml b/pyproject.toml
index acdfcd8..55701cd 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -61,7 +61,7 @@ check = [
     "packaging",
 ]
 docs = [
-    "sphinx>=2.3",
+    "sphinx>=5.0",
     "sphinx_rtd_theme",
     "sphinx-py3doc-enhanced-theme",
 ]