diff --git a/doc/requirements.txt b/doc/requirements.txt
index 210a051..acf37f3 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -4,4 +4,4 @@ doc8>=0.6.0 # Apache-2.0
 sphinx>=2.0.0,!=2.1.0 # BSD
 os-api-ref>=1.4.0 # Apache-2.0
 sphinxcontrib-apidoc>=0.2.0  # BSD
-sphinxcontrib-svg2pdfconverter  # BSD
+sphinxcontrib-svg2pdfconverter>=0.1.0  # BSD