diff --git a/e2e/backend/test_spm_slow b/e2e/backend/test_spm_slow
index 5e91fc0b3..dee818d8b 100644
--- a/e2e/backend/test_spm_slow
+++ b/e2e/backend/test_spm_slow
@@ -10,7 +10,7 @@ assert "mise x spm:nicklockwood/SwiftFormat@0.53.10 -- swiftformat --version" "0
 assert "mise x spm:https://github.com/nicklockwood/SwiftFormat.git@0.53.10 -- swiftformat --version" "0.53.10"
 
 # test package with resources (`templates list` command depends on resources being installed)
-assert "mise x spm:SwiftGen/SwiftGen --verbose -- swiftgen templates list --only colors" "colors:
+assert "mise x spm:SwiftGen/SwiftGen@6.6.2 --verbose -- swiftgen templates list --only colors" "colors:
    - literals-swift4
    - literals-swift5
    - swift4