diff --git a/swig.yaml b/swig.yaml
index eaa5bee..d8a647a 100644
--- a/swig.yaml
+++ b/swig.yaml
@@ -20,14 +20,14 @@ data:
         buildrequires:
             platform: f27
             autotools: f27
-            boost: f27
-            help2man: f27
-            perl: f27
-            python2: f27
-            python3: f27
+            boost: 1.64
+            help2man: 1.47
+            perl: 5.26
+            python2: 2.7
+            python3: 3.6
         requires:
             platform: f27
-            perl: f27
+            perl: 5.26
     profiles:
         default:
             rpms:
@@ -63,11 +63,11 @@ data:
         rpms:
             dos2unix:
                 rationale: A build dependency
-                ref: master
+                ref: f27
             bison:
                 rationale: A build dependency
-                ref: master
+                ref: f27
             swig:
                 rationale: SWIG program
-                ref: master
+                ref: f27
                 buildorder: 1