diff --git a/requirements.txt b/requirements.txt
index 7fd23e67..67e9e646 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,11 +9,11 @@ wget==3.2
 joblib==1.0.1
 pytest==6.2.5
 pytest-cov==2.12.1
-jsonschema==3.2.0
-tqdm==4.62.2
+jsonschema==4.0.1
+tqdm==4.62.3
 colorlog==6.4.1
-emcee
-corner
+emcee==3.1.1
+corner==2.2.1
 
 # optional for tools combine
 # git+https://github.com/cylammarco/SpectRes