diff --git a/benchmark/Manifest.toml b/benchmark/Manifest.toml
index 5c2016e2..f801e77d 100644
--- a/benchmark/Manifest.toml
+++ b/benchmark/Manifest.toml
@@ -13,11 +13,11 @@ version = "2.0.0"
 
 [[BangBang]]
 deps = ["Compat", "ConstructionBase", "Future", "InitialValues", "LinearAlgebra", "Requires", "Setfield", "Tables", "ZygoteRules"]
-git-tree-sha1 = "886ad3a8b339762fb5684e962dc89215a6859f6a"
+git-tree-sha1 = "f42321255afc37da855b6cd9f2a1fc36c017ceee"
 repo-rev = "master"
 repo-url = "https://github.com/JuliaFolds/BangBang.jl.git"
 uuid = "198e06fe-97b7-11e9-32a5-e1d131e6ad66"
-version = "0.3.27"
+version = "0.3.29"
 
 [[Base64]]
 uuid = "2a0f44e3-6c83-55bd-87e4-b1978d98bd5f"
@@ -58,6 +58,11 @@ version = "1.0.0"
 deps = ["Printf"]
 uuid = "ade2ca70-3891-5945-98fb-dc099432e06a"
 
+[[DefineSingletons]]
+git-tree-sha1 = "1a356f194281dff9ef1119faa9125a0d4e210729"
+uuid = "244e2a9f-e319-4986-a169-4d1fe445cd52"
+version = "0.1.0"
+
 [[DelimitedFiles]]
 deps = ["Mmap"]
 uuid = "8bb1440f-4735-579b-a4ab-409b98df4dab"
@@ -71,9 +76,10 @@ deps = ["Random"]
 uuid = "9fa8497b-333b-5362-9e8d-4d0656e87820"
 
 [[InitialValues]]
-git-tree-sha1 = "f3458faa269a6edefb2c329c26fdc829771c993b"
+deps = ["Pkg"]
+git-tree-sha1 = "e8dbe594d2dabcf66d7cd04a315553b067da5e04"
 uuid = "22cec73e-a1b8-11e9-2c92-598750a2cf9c"
-version = "0.2.7"
+version = "0.2.8"
 
 [[InteractiveUtils]]
 deps = ["Markdown"]
@@ -232,12 +238,12 @@ uuid = "ac1d9e8a-700a-412c-b207-f0111f4b6c0d"
 version = "0.1.3-DEV"
 
 [[Transducers]]
-deps = ["ArgCheck", "BangBang", "CompositionsBase", "Distributed", "InitialValues", "Logging", "Markdown", "Requires", "Setfield", "SplittablesBase", "Tables"]
-git-tree-sha1 = "329e69f3104057ae0aaab823c447bd7d5aae1d8b"
+deps = ["ArgCheck", "BangBang", "CompositionsBase", "DefineSingletons", "Distributed", "InitialValues", "Logging", "Markdown", "Requires", "Setfield", "SplittablesBase", "Tables"]
+git-tree-sha1 = "d9bfa17064d3ea0da8213aa315d55cb8c84b60db"
 repo-rev = "master"
 repo-url = "https://github.com/tkf/Transducers.jl.git"
 uuid = "28d57a85-8fef-5791-bfe6-a80928e7c999"
-version = "0.4.39"
+version = "0.4.41-DEV"
 
 [[UUIDs]]
 deps = ["Random", "SHA"]
diff --git a/docs/Manifest.toml b/docs/Manifest.toml
index a457ed0d..fd5d6fc7 100644
--- a/docs/Manifest.toml
+++ b/docs/Manifest.toml
@@ -13,11 +13,11 @@ version = "2.0.0"
 
 [[BangBang]]
 deps = ["Compat", "ConstructionBase", "Future", "InitialValues", "LinearAlgebra", "Requires", "Setfield", "Tables", "ZygoteRules"]
-git-tree-sha1 = "886ad3a8b339762fb5684e962dc89215a6859f6a"
+git-tree-sha1 = "f42321255afc37da855b6cd9f2a1fc36c017ceee"
 repo-rev = "master"
 repo-url = "https://github.com/JuliaFolds/BangBang.jl.git"
 uuid = "198e06fe-97b7-11e9-32a5-e1d131e6ad66"
-version = "0.3.27"
+version = "0.3.29"
 
 [[Base64]]
 uuid = "2a0f44e3-6c83-55bd-87e4-b1978d98bd5f"
@@ -58,6 +58,11 @@ version = "1.0.0"
 deps = ["Printf"]
 uuid = "ade2ca70-3891-5945-98fb-dc099432e06a"
 
+[[DefineSingletons]]
+git-tree-sha1 = "1a356f194281dff9ef1119faa9125a0d4e210729"
+uuid = "244e2a9f-e319-4986-a169-4d1fe445cd52"
+version = "0.1.0"
+
 [[DelimitedFiles]]
 deps = ["Mmap"]
 uuid = "8bb1440f-4735-579b-a4ab-409b98df4dab"
@@ -83,9 +88,10 @@ deps = ["Random"]
 uuid = "9fa8497b-333b-5362-9e8d-4d0656e87820"
 
 [[InitialValues]]
-git-tree-sha1 = "f3458faa269a6edefb2c329c26fdc829771c993b"
+deps = ["Pkg"]
+git-tree-sha1 = "e8dbe594d2dabcf66d7cd04a315553b067da5e04"
 uuid = "22cec73e-a1b8-11e9-2c92-598750a2cf9c"
-version = "0.2.7"
+version = "0.2.8"
 
 [[InteractiveUtils]]
 deps = ["Markdown"]
@@ -264,12 +270,12 @@ uuid = "ac1d9e8a-700a-412c-b207-f0111f4b6c0d"
 version = "0.1.3-DEV"
 
 [[Transducers]]
-deps = ["ArgCheck", "BangBang", "CompositionsBase", "Distributed", "InitialValues", "Logging", "Markdown", "Requires", "Setfield", "SplittablesBase", "Tables"]
-git-tree-sha1 = "329e69f3104057ae0aaab823c447bd7d5aae1d8b"
+deps = ["ArgCheck", "BangBang", "CompositionsBase", "DefineSingletons", "Distributed", "InitialValues", "Logging", "Markdown", "Requires", "Setfield", "SplittablesBase", "Tables"]
+git-tree-sha1 = "d9bfa17064d3ea0da8213aa315d55cb8c84b60db"
 repo-rev = "master"
 repo-url = "https://github.com/tkf/Transducers.jl.git"
 uuid = "28d57a85-8fef-5791-bfe6-a80928e7c999"
-version = "0.4.39"
+version = "0.4.41-DEV"
 
 [[UUIDs]]
 deps = ["Random", "SHA"]
diff --git a/src/ThreadsX.jl b/src/ThreadsX.jl
index 766a15a8..c07baddc 100644
--- a/src/ThreadsX.jl
+++ b/src/ThreadsX.jl
@@ -39,13 +39,14 @@ using ArgCheck: @argcheck, @check
 using BangBang: SingletonVector, append!!, push!!, union!!
 using Base: Ordering, add_sum, mapreduce_empty, mul_prod, reduce_empty
 using ConstructionBase: setproperties
-using InitialValues: Init, asmonoid
+using InitialValues: asmonoid
 using Referenceables: referenceable
 using Setfield: @set
 using Transducers:
     Cat,
     Empty,
     Filter,
+    Init,
     Map,
     MapSplat,
     OnInit,
diff --git a/test/environments/main/Manifest.toml b/test/environments/main/Manifest.toml
index d82ffa40..43b08ceb 100644
--- a/test/environments/main/Manifest.toml
+++ b/test/environments/main/Manifest.toml
@@ -19,11 +19,11 @@ version = "2.0.0"
 
 [[BangBang]]
 deps = ["Compat", "ConstructionBase", "Future", "InitialValues", "LinearAlgebra", "Requires", "Setfield", "Tables", "ZygoteRules"]
-git-tree-sha1 = "886ad3a8b339762fb5684e962dc89215a6859f6a"
+git-tree-sha1 = "f42321255afc37da855b6cd9f2a1fc36c017ceee"
 repo-rev = "master"
 repo-url = "https://github.com/JuliaFolds/BangBang.jl.git"
 uuid = "198e06fe-97b7-11e9-32a5-e1d131e6ad66"
-version = "0.3.27"
+version = "0.3.29"
 
 [[Base64]]
 uuid = "2a0f44e3-6c83-55bd-87e4-b1978d98bd5f"
@@ -64,6 +64,11 @@ version = "1.0.0"
 deps = ["Printf"]
 uuid = "ade2ca70-3891-5945-98fb-dc099432e06a"
 
+[[DefineSingletons]]
+git-tree-sha1 = "1a356f194281dff9ef1119faa9125a0d4e210729"
+uuid = "244e2a9f-e319-4986-a169-4d1fe445cd52"
+version = "0.1.0"
+
 [[DelimitedFiles]]
 deps = ["Mmap"]
 uuid = "8bb1440f-4735-579b-a4ab-409b98df4dab"
@@ -89,9 +94,10 @@ deps = ["Random"]
 uuid = "9fa8497b-333b-5362-9e8d-4d0656e87820"
 
 [[InitialValues]]
-git-tree-sha1 = "f3458faa269a6edefb2c329c26fdc829771c993b"
+deps = ["Pkg"]
+git-tree-sha1 = "e8dbe594d2dabcf66d7cd04a315553b067da5e04"
 uuid = "22cec73e-a1b8-11e9-2c92-598750a2cf9c"
-version = "0.2.7"
+version = "0.2.8"
 
 [[InteractiveUtils]]
 deps = ["Markdown"]
@@ -270,12 +276,12 @@ uuid = "ac1d9e8a-700a-412c-b207-f0111f4b6c0d"
 version = "0.1.3-DEV"
 
 [[Transducers]]
-deps = ["ArgCheck", "BangBang", "CompositionsBase", "Distributed", "InitialValues", "Logging", "Markdown", "Requires", "Setfield", "SplittablesBase", "Tables"]
-git-tree-sha1 = "329e69f3104057ae0aaab823c447bd7d5aae1d8b"
+deps = ["ArgCheck", "BangBang", "CompositionsBase", "DefineSingletons", "Distributed", "InitialValues", "Logging", "Markdown", "Requires", "Setfield", "SplittablesBase", "Tables"]
+git-tree-sha1 = "d9bfa17064d3ea0da8213aa315d55cb8c84b60db"
 repo-rev = "master"
 repo-url = "https://github.com/tkf/Transducers.jl.git"
 uuid = "28d57a85-8fef-5791-bfe6-a80928e7c999"
-version = "0.4.39"
+version = "0.4.41-DEV"
 
 [[UUIDs]]
 deps = ["Random", "SHA"]