diff --git a/.github/workflows/endurance.yml b/.github/workflows/endurance.yml
index dcc4d4574..8d9d64a13 100644
--- a/.github/workflows/endurance.yml
+++ b/.github/workflows/endurance.yml
@@ -17,6 +17,6 @@ jobs:
           make -j8
     - name: test-multithread (5X)
       run: |
-        sudo apt-get install -y tcl8.5
+        sudo apt-get install -y tcl tcl-tls
         ./runtest --loopn 5 --config server-threads 3 --clients 5 --endurance