diff --git a/build-gating.fmf b/build-gating.fmf
index f95335e..20176bf 100644
--- a/build-gating.fmf
+++ b/build-gating.fmf
@@ -27,6 +27,10 @@ adjust:
     environment+:
       WITH_SCL: "scl enable llvm-toolset-14.0"
     when: "collection == llvm-toolset-14.0"
+  - because: "When testing SCL-ized LLVM, the collection must be enabled first"
+    environment+:
+      WITH_SCL: "scl enable llvm-toolset-15.0"
+    when: "collection == llvm-toolset-15.0"
 
   # Unfortunately, TMT does not support more declarative approach, we need to run commands on our own.
   - because: "On RHEL, CRB must be enabled to provide rarer packages"
diff --git a/sanity/main.fmf b/sanity/main.fmf
index 2718613..2b2277a 100644
--- a/sanity/main.fmf
+++ b/sanity/main.fmf
@@ -23,3 +23,6 @@ adjust:
   - require+:
       - llvm-toolset-14.0-python3-lit
     when: "collection == llvm-toolset-14.0"
+  - require+:
+      - llvm-toolset-15.0-python3-lit
+    when: "collection == llvm-toolset-15.0"