diff --git a/requirements_test.txt b/requirements_test.txt
index 162a4d89ee5..ebe359e7b54 100644
--- a/requirements_test.txt
+++ b/requirements_test.txt
@@ -4,5 +4,5 @@ coveralls>=1.1
 pytest>=2.8.0
 pytest-cov>=2.2.0
 pytest-timeout>=1.0.0
-betamax>=0.5.1
+betamax==0.5.1
 pydocstyle>=1.0.0