diff --git a/composer.json b/composer.json
index 059249bce1a64de336d28b9574271e17a5b9a238..238ee755b24522904c07248cd534e90a89d7f085 100644
--- a/composer.json
+++ b/composer.json
@@ -10,7 +10,7 @@
     "require": {
         "unicaen/app": "^4.0",
         "unicaen/bjy-authorize": "^4.0",
-        "jasig/phpcas": "^1.3",
+        "jasig/phpcas": "1.5.*",
         "ramsey/uuid": "^3.7",
         "laminas/laminas-dependency-plugin": "^2.1"
     },