diff --git a/.wp-env.json b/.wp-env.json
index ccd1231aa28b2..4d67d71c82fb5 100644
--- a/.wp-env.json
+++ b/.wp-env.json
@@ -3,7 +3,7 @@
 	"plugins": [
 		"."
 	],
-	"themes": [ "WordPress/theme-experiments/tt1-blocks" ],
+	"themes": [ "WordPress/theme-experiments/tt1-blocks#tt1-blocks@0.4.3" ],
 	"env": {
 		"tests": {
 			"mappings": {
diff --git a/packages/env/lib/config/test/config.js b/packages/env/lib/config/test/config.js
index c9d620b12d218..fef400492b68c 100644
--- a/packages/env/lib/config/test/config.js
+++ b/packages/env/lib/config/test/config.js
@@ -366,6 +366,7 @@ describe( 'readConfig', () => {
 							'WordPress/gutenberg',
 							'WordPress/gutenberg#master',
 							'WordPress/gutenberg#5.0',
+							'WordPress/theme-experiments/tt1-blocks#tt1-blocks@0.4.3',
 						],
 					} )
 				)
@@ -394,6 +395,16 @@ describe( 'readConfig', () => {
 						path: expect.stringMatching( /^\/.*gutenberg$/ ),
 						basename: 'gutenberg',
 					},
+					{
+						type: 'git',
+						url:
+							'https://github.com/WordPress/theme-experiments.git',
+						ref: 'tt1-blocks@0.4.3',
+						path: expect.stringMatching(
+							/^\/.*theme-experiments\/tt1-blocks$/
+						),
+						basename: 'tt1-blocks',
+					},
 				],
 			};
 			expect( config.env.tests ).toMatchObject( matchObj );