diff --git a/requirements.txt b/requirements.txt
index cb725eb..679d102 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,7 +4,7 @@ scipy
 progressbar
 emcee
 pyyaml
-jinja2
+jinja2==3.1.4
 cython
 george
 nestle
diff --git a/requirements_dev.txt b/requirements_dev.txt
index 1ace67f..614365f 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -3,7 +3,7 @@ scipy
 progressbar
 emcee
 pyyaml
-jinja2
+jinja2==3.1.4
 cython
 george
 nestle