diff --git a/archive/p/prolog/README.md b/archive/p/prolog/README.md
index aaf1e8f27..e397aa0d7 100644
--- a/archive/p/prolog/README.md
+++ b/archive/p/prolog/README.md
@@ -71,7 +71,7 @@ For example, the "Hello World" sample would be named this:
 The following list shares details about what we're using to test all Sample Programs in Prolog:
 
 - Docker Image: swipl
-- Docker Tag: stable
+- Docker Tag: 9.3.11
 
 See the [Glotter2 project](https://github.com/rzuckerm/glotter2) for more information on how to create a testinfo file.