diff --git a/core/src/main/scala/sbt/librarymanagement/ConflictWarning.scala b/core/src/main/scala/sbt/librarymanagement/ConflictWarning.scala
index 02355408f..5fea69f37 100644
--- a/core/src/main/scala/sbt/librarymanagement/ConflictWarning.scala
+++ b/core/src/main/scala/sbt/librarymanagement/ConflictWarning.scala
@@ -49,7 +49,7 @@ object ConflictWarning {
         if (differentFullNames.size > 1) differentFullNames else Set.empty[String]
       }
     }
-    (Map.empty[(String, String), Set[String]] /: mismatches)(merge)
+    mismatches.foldLeft(Map.empty[(String, String), Set[String]])(merge)
   }
   private[this] def merge[A, B](m: Map[A, Set[B]], b: (A, Set[B])): Map[A, Set[B]] =
     if (b._2.isEmpty) m
diff --git a/ivy/src/main/scala/sbt/internal/librarymanagement/Ivy.scala b/ivy/src/main/scala/sbt/internal/librarymanagement/Ivy.scala
index 5a257844e..b50914ea9 100644
--- a/ivy/src/main/scala/sbt/internal/librarymanagement/Ivy.scala
+++ b/ivy/src/main/scala/sbt/internal/librarymanagement/Ivy.scala
@@ -774,7 +774,7 @@ private[sbt] object IvySbt {
       elem: scala.xml.Elem,
       extra: Map[String, String]
   ): scala.xml.Elem =
-    (elem /: extra) {
+    extra.foldLeft(elem) {
       case (e, (key, value)) => e % new scala.xml.UnprefixedAttribute(key, value, scala.xml.Null)
     }
   private def hasInfo(module: ModuleID, x: scala.xml.NodeSeq) = {
diff --git a/ivy/src/main/scala/sbt/internal/librarymanagement/ivyint/CachedResolutionResolveEngine.scala b/ivy/src/main/scala/sbt/internal/librarymanagement/ivyint/CachedResolutionResolveEngine.scala
index d2d8086ba..cf24d61d3 100644
--- a/ivy/src/main/scala/sbt/internal/librarymanagement/ivyint/CachedResolutionResolveEngine.scala
+++ b/ivy/src/main/scala/sbt/internal/librarymanagement/ivyint/CachedResolutionResolveEngine.scala
@@ -957,9 +957,9 @@ private[sbt] trait CachedResolutionResolveEngine extends ResolveEngine {
     }: _*)
     // This emulates test-internal extending test configuration etc.
     val remappedConfigs: Map[String, Vector[String]] =
-      (remappedConfigs0 /: rootModuleConfs) { (acc0, c) =>
+      rootModuleConfs.foldLeft(remappedConfigs0) { (acc0, c) =>
         val ps = parentConfigs(c.getName)
-        (acc0 /: ps) { (acc, parent) =>
+        ps.foldLeft(acc0) { (acc, parent) =>
           val vs0 = acc.getOrElse(c.getName, Vector())
           val vs = acc.getOrElse(parent, Vector())
           acc.updated(c.getName, (vs0 ++ vs).distinct)