diff --git a/ContainersPrelude.juvix b/ContainersPrelude.juvix
index 448712b..e409c58 100644
--- a/ContainersPrelude.juvix
+++ b/ContainersPrelude.juvix
@@ -2,7 +2,7 @@ module ContainersPrelude;
 
 import Juvix.Builtin.V1 open public;
 import Stdlib.Data.String.Base open public;
-import Stdlib.Data.Product open public;
+import Stdlib.Data.Pair open public;
 import Stdlib.Data.List.Base open public;
 import Stdlib.System.IO.Base open public;
 import Stdlib.System.IO.String open public;
diff --git a/Data/Map.juvix b/Data/Map.juvix
index 1cfbeaf..0ae0ea9 100644
--- a/Data/Map.juvix
+++ b/Data/Map.juvix
@@ -19,7 +19,7 @@ key {A B} : Binding A B -> A
 value {A B} : Binding A B -> B
   | (binding _ b) := b;
 
-toPair {A B} : Binding A B -> A × B
+toPair {A B} : Binding A B -> Pair A B
   | (binding a b) := a, b;
 
 instance
@@ -49,14 +49,14 @@ lookup {A B} {{Ord A}} (k : A) : Map A B -> Maybe B
 
 {-# specialize: [1, f] #-}
 fromListWith {A B} {{Ord A}} (f : B -> B -> B) (xs : List
-  (A × B)) : Map A B :=
+  (Pair A B)) : Map A B :=
   for (acc := empty) (k, v in xs)
     insertWith f k v acc;
 
-fromList {A B} {{Ord A}} : List (A × B) -> Map A B :=
+fromList {A B} {{Ord A}} : List (Pair A B) -> Map A B :=
   fromListWith λ {old new := new};
 
-toList {A B} : Map A B -> List (A × B)
+toList {A B} : Map A B -> List (Pair A B)
   | (mkMap s) := map (x in Set.toList s) toPair x;
 
 size {A B} : Map A B -> Nat
diff --git a/Data/Queue/Base.juvix b/Data/Queue/Base.juvix
index 52e69df..04d3c4d 100644
--- a/Data/Queue/Base.juvix
+++ b/Data/Queue/Base.juvix
@@ -41,7 +41,7 @@ check {A} : Queue A -> Queue A
 
 --- 𝒪(n) worst-case, but 𝒪(1) amortized. Returns the first element and the
 --  rest of the ;Queue;. If the ;Queue; is empty then returns ;nothing;.
-pop {A} : Queue A -> Maybe (A × Queue A)
+pop {A} : Queue A -> Maybe (Pair A (Queue A))
   | (queue nil _) := nothing
   | (queue (x :: front) back) :=
     just (x, check (queue front back));
@@ -74,7 +74,7 @@ eqQueueI {A} {{Eq A}} : Eq (Queue A) :=
 
 instance
 showQueueI {A} {{Show A}} : Show (Queue A) :=
-  mkShow (Show.show ∘ toList);
+  mkShow (toList >> Show.show);
 
 instance
 ordQueueI {A} {{Ord A}} : Ord (Queue A) :=
diff --git a/Data/Set/AVL.juvix b/Data/Set/AVL.juvix
index 850f50f..9c9172b 100644
--- a/Data/Set/AVL.juvix
+++ b/Data/Set/AVL.juvix
@@ -105,7 +105,7 @@ lookupWith {A K} {{o : Ord K}} (f : A -> K) (x : K)
 --- 𝒪(log 𝓃). Queries whether an element is in an ;AVLTree;.
 {-# specialize: [1] #-}
 member? {A} {{Ord A}} (x : A) : AVLTree A -> Bool :=
-  isJust ∘ lookupWith id x;
+  lookupWith id x >> isJust;
 
 --- 𝒪(log 𝓃). Inserts an element into and ;AVLTree; using a function to
 --- deduplicate entries.
@@ -134,7 +134,7 @@ insert {A} {{Ord A}} : A -> AVLTree A -> AVLTree A :=
 delete {A} {{o : Ord A}} (x : A) : AVLTree A -> AVLTree A :=
   let
     {-# specialize-by: [o] #-}
-    deleteMin : AVLTree A -> Maybe (A × AVLTree A)
+    deleteMin : AVLTree A -> Maybe (Pair A (AVLTree A))
       | empty := nothing
       | (node v _ l r) :=
         case deleteMin l of {
@@ -228,7 +228,7 @@ toTree {A} : AVLTree A -> Maybe (Tree A)
 
 --- Returns the textual representation of an ;AVLTree;.
 pretty {A} {{Show A}} : AVLTree A -> String :=
-  maybe "empty" Tree.treeToString ∘ toTree;
+  toTree >> maybe "empty" Tree.treeToString;
 
 instance
 eqAVLTreeI {A} {{Eq A}} : Eq (AVLTree A) :=
diff --git a/Data/Tmp.juvix b/Data/Tmp.juvix
index dcb0ccd..1e39bc8 100644
--- a/Data/Tmp.juvix
+++ b/Data/Tmp.juvix
@@ -2,11 +2,12 @@
 module Data.Tmp;
 
 import ContainersPrelude open;
+import Stdlib.Trait open;
 
 printNatListLn : List Nat → IO
   | nil := printStringLn "nil"
   | (x :: xs) :=
-    printNat x >> printString " :: " >> printNatListLn xs;
+    printNat x >>> printString " :: " >>> printNatListLn xs;
 
 mapMaybe {A B} (f : A -> B) : Maybe A -> Maybe B
   | nothing := nothing
diff --git a/Data/Tree.juvix b/Data/Tree.juvix
index 86a1f33..bcd836f 100644
--- a/Data/Tree.juvix
+++ b/Data/Tree.juvix
@@ -26,7 +26,7 @@ drawForest {A} {{Show A}} : Forest A -> List String
     "|" :: shift "+- " "|  " (draw h) ++ drawForest hs;
 
 treeToString {A} {{Show A}} : Tree A -> String :=
-  unlines ∘ draw;
+  draw >> unlines;
 
 forestToString {A} {{Show A}} : Forest A -> String :=
-  unlines ∘ drawForest;
+  drawForest >> unlines;
diff --git a/Package.juvix b/Package.juvix
index 8dba83a..aca544a 100644
--- a/Package.juvix
+++ b/Package.juvix
@@ -5,5 +5,9 @@ import PackageDescription.V2 open;
 package : Package :=
   defaultPackage
     {name := "containers";
-     version := mkVersion 0 11 0;
-     dependencies := [github "anoma" "juvix-stdlib" "v0.3.0"]};
+     version := mkVersion 0 12 0;
+     dependencies := [ github
+                       "anoma"
+                       "juvix-stdlib"
+                       "v0.4.0"
+                     ]};
diff --git a/juvix.lock.yaml b/juvix.lock.yaml
index 790dd53..578925c 100644
--- a/juvix.lock.yaml
+++ b/juvix.lock.yaml
@@ -1,11 +1,11 @@
-# This file was autogenerated by Juvix version 0.6.1.
+# This file was autogenerated by Juvix version 0.6.3.
 # Do not edit this file manually.
 
 version: 2
-checksum: 75024fc227f6d942045d351ee3d066579e709c363a65d02928019b74a165ab49
+checksum: 9915437ae9fa7cc71e22a1cc18517849f7695b04dfd8fecfce0d8ec5285aa9cd
 dependencies:
 - git:
     name: anoma_juvix-stdlib
-    ref: e2efe4e6fe8e8bf1766050a7fa7ad8ff4e8c69fc
+    ref: 89a5960fb8a29291e9271986b98ca7b1edf4031b
     url: https://github.com/anoma/juvix-stdlib
   dependencies: []
diff --git a/test/Main.juvix b/test/Main.juvix
index be6a97c..f737a16 100644
--- a/test/Main.juvix
+++ b/test/Main.juvix
@@ -7,4 +7,8 @@ import Test.Map open using {suite as mapSuite};
 import Test.Queue open using {suite as queueSuite};
 import Test.UnbalancedSet open using {suite as unbalancedSetSuite};
 
-main : IO := runTestSuite avlSuite >> runTestSuite mapSuite >> runTestSuite queueSuite >> runTestSuite unbalancedSetSuite;
+main : IO :=
+  runTestSuite avlSuite
+    >>> runTestSuite mapSuite
+    >>> runTestSuite queueSuite
+    >>> runTestSuite unbalancedSetSuite;
diff --git a/test/Package.juvix b/test/Package.juvix
index b86be33..77859b5 100644
--- a/test/Package.juvix
+++ b/test/Package.juvix
@@ -6,7 +6,7 @@ package : Package :=
   defaultPackage
     {name := "containers-tests";
      main := just "Main.juvix";
-     dependencies := [ github "anoma" "juvix-stdlib" "v0.3.0"
-                     ; github "anoma" "juvix-test" "v0.10.0"
+     dependencies := [ github "anoma" "juvix-stdlib" "v0.4.0"
+                     ; github "anoma" "juvix-test" "v0.11.0"
                      ; path "../"
                      ]};
diff --git a/test/Test/AVL.juvix b/test/Test/AVL.juvix
index a6f4cf0..8c4715f 100644
--- a/test/Test/AVL.juvix
+++ b/test/Test/AVL.juvix
@@ -4,13 +4,13 @@ import Test.JuvixUnit open;
 import Juvix.Builtin.V1 open;
 import Stdlib.System.IO.Base open;
 import Stdlib.System.IO.String open;
-import Stdlib.Data.Product open;
+import Stdlib.Data.Pair open;
 import Stdlib.Data.List.Base open;
 
 import Data.Set.AVL open;
 
 --- Test for size and balance.
-mkTests : String × Nat × AVLTree Nat -> List Test
+mkTests : Pair String (Pair Nat (AVLTree Nat)) -> List Test
   | (title, len, s) :=
     let
       mkTitle : String -> String
@@ -25,7 +25,7 @@ mkTests : String × Nat × AVLTree Nat -> List Test
          (assertTrue balanceMsg (isBalanced s))
        ];
 
-TestDescr : Type := String × Nat × AVLTree Nat;
+TestDescr : Type := Pair String (Pair Nat (AVLTree Nat));
 
 s1 : TestDescr := "s1", 5, fromList [1; 2; 8; 3; 3; 2; 9];
 
@@ -51,5 +51,5 @@ suite : TestSuite := testSuite "AVL Set" tests;
 
 main : IO :=
   printStringLn (pretty (snd (snd s1)))
-    >> printStringLn (prettyDebug (snd (snd s1)))
-    >> runTestSuite suite;
+    >>> printStringLn (prettyDebug (snd (snd s1)))
+    >>> runTestSuite suite;
diff --git a/test/Test/Map.juvix b/test/Test/Map.juvix
index 8334546..37e008e 100644
--- a/test/Test/Map.juvix
+++ b/test/Test/Map.juvix
@@ -2,7 +2,7 @@ module Test.Map;
 
 import Juvix.Builtin.V1 open;
 import Stdlib.System.IO.Base open;
-import Stdlib.Data.Product open;
+import Stdlib.Data.Pair open;
 import Stdlib.Data.List open using {quickSort};
 import Stdlib.Function open;
 import Test.JuvixUnit open;
@@ -17,7 +17,7 @@ tests : List Test :=
     m2 : Map Nat Nat :=
       Map.insert 3 4 (Map.insert 1 2 Map.empty);
     assertEqListPair
-      : List (Nat × Nat) -> List (Nat × Nat) -> Assertion
+      : List (Pair Nat Nat) -> List (Pair Nat Nat) -> Assertion
       | actual expected :=
         assertEqual
           "lists are not equal"
diff --git a/test/Test/Queue.juvix b/test/Test/Queue.juvix
index b068bba..126b18e 100644
--- a/test/Test/Queue.juvix
+++ b/test/Test/Queue.juvix
@@ -3,7 +3,7 @@ module Test.Queue;
 import Juvix.Builtin.V1 open;
 import Stdlib.System.IO.Base open;
 import Stdlib.Function open;
-import Stdlib.Data.Product open;
+import Stdlib.Data.Pair open;
 import Test.JuvixUnit open;
 
 import Data.Queue open;
@@ -39,7 +39,7 @@ tests : List Test :=
        "Queue.fromList composes with toList should be the identity"
        (assertEqual
          "fromList . toList should be the identity"
-         (fromList ∘ toList $ q3)
+         (toList >> fromList <| q3)
          q3)
      ; testCase
        "Queue.pop should remove first element"
@@ -52,7 +52,7 @@ tests : List Test :=
        (assertEqual
          "tail of queue q3"
          (tail q3)
-         ((just ∘ fromList) [2; 3]))
+         ((fromList >> just) [2; 3]))
      ];
 
 suite : TestSuite := testSuite "Queue" tests;
diff --git a/test/juvix.lock.yaml b/test/juvix.lock.yaml
index 6bad5a2..c11238e 100644
--- a/test/juvix.lock.yaml
+++ b/test/juvix.lock.yaml
@@ -1,28 +1,28 @@
-# This file was autogenerated by Juvix version 0.6.2.
+# This file was autogenerated by Juvix version 0.6.3.
 # Do not edit this file manually.
 
 version: 2
-checksum: 9c537bb8969fcc407cae30fdd701846137d3980db8ef118a2724fd7f490e8c00
+checksum: 23c0c8c38f6e1b5351519e97e3aa5f998d3396cd7d67846aaebf78eac94b8dd1
 dependencies:
 - git:
     name: anoma_juvix-stdlib
-    ref: 73ecbc57738f4bde6f4f39636436ba38504b33f6
+    ref: 89a5960fb8a29291e9271986b98ca7b1edf4031b
     url: https://github.com/anoma/juvix-stdlib
   dependencies: []
 - git:
     name: anoma_juvix-test
-    ref: 4e54de43de077eb95329202902ba15891c14b068
+    ref: 4254b60351f283f31868498d4e238af8259243f8
     url: https://github.com/anoma/juvix-test
   dependencies:
   - git:
       name: anoma_juvix-stdlib
-      ref: 73ecbc57738f4bde6f4f39636436ba38504b33f6
+      ref: 89a5960fb8a29291e9271986b98ca7b1edf4031b
       url: https://github.com/anoma/juvix-stdlib
     dependencies: []
 - path: ../
   dependencies:
   - git:
       name: anoma_juvix-stdlib
-      ref: e2efe4e6fe8e8bf1766050a7fa7ad8ff4e8c69fc
+      ref: 00f6f503dbc2cfa72bd469fb8ce7edd0e9730639
       url: https://github.com/anoma/juvix-stdlib
     dependencies: []