diff --git a/docs/requirements.txt b/docs/requirements.txt
index 7a392aa52..5fba631c7 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,2 +1,2 @@
 sphinx_rtd_theme>=0.3.1
-pygments-lexer-solidity>=0.3
+pygments-lexer-solidity>=0.3.1