diff --git a/Project.toml b/Project.toml
index fbff761..bab5cc8 100644
--- a/Project.toml
+++ b/Project.toml
@@ -9,10 +9,14 @@ Setfield = "efcf1570-3423-57d1-acb7-fd33fddbac46"
 Transducers = "28d57a85-8fef-5791-bfe6-a80928e7c999"
 
 [compat]
+Adapt = "2, 3"
+Setfield = "0.3, 0.4, 0.5, 0.6, 0.7"
+Transducers = "0.4"
 julia = "1"
 
 [extras]
+Aqua = "4c88cf16-eb10-579e-8560-4a9242c79595"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 
 [targets]
-test = ["Test"]
+test = ["Aqua", "Test"]
diff --git a/test/environments/jl10/Manifest.toml b/test/environments/jl10/Manifest.toml
index b29fa8c..5ef94b7 100644
--- a/test/environments/jl10/Manifest.toml
+++ b/test/environments/jl10/Manifest.toml
@@ -4,6 +4,12 @@ git-tree-sha1 = "27edd95a09fd428113ca019c092e8aeca2eb1f2d"
 uuid = "79e6a3ab-5dfb-504d-930d-738a2a938a0e"
 version = "3.0.0"
 
+[[Aqua]]
+deps = ["Pkg", "Test"]
+git-tree-sha1 = "b28b1f08e814090ef35eec6ab974264b3a93c862"
+uuid = "4c88cf16-eb10-579e-8560-4a9242c79595"
+version = "0.5.0"
+
 [[ArgCheck]]
 git-tree-sha1 = "dedbbb2ddb876f899585c4ec4433265e3017215a"
 uuid = "dce04be8-c92d-5529-be00-80e4d2c0e197"
diff --git a/test/environments/jl10/Project.toml b/test/environments/jl10/Project.toml
index 85df747..88f22ed 100644
--- a/test/environments/jl10/Project.toml
+++ b/test/environments/jl10/Project.toml
@@ -1,4 +1,5 @@
 [deps]
+Aqua = "4c88cf16-eb10-579e-8560-4a9242c79595"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 Transducers = "28d57a85-8fef-5791-bfe6-a80928e7c999"
 UnionArrays = "d6dd79e4-993b-11e9-1366-0de1c9fe1122"
diff --git a/test/environments/main/Manifest.toml b/test/environments/main/Manifest.toml
index eb6ca5b..2035667 100644
--- a/test/environments/main/Manifest.toml
+++ b/test/environments/main/Manifest.toml
@@ -6,6 +6,12 @@ git-tree-sha1 = "ffcfa2d345aaee0ef3d8346a073d5dd03c983ebe"
 uuid = "79e6a3ab-5dfb-504d-930d-738a2a938a0e"
 version = "3.2.0"
 
+[[Aqua]]
+deps = ["Pkg", "Test"]
+git-tree-sha1 = "b28b1f08e814090ef35eec6ab974264b3a93c862"
+uuid = "4c88cf16-eb10-579e-8560-4a9242c79595"
+version = "0.5.0"
+
 [[ArgCheck]]
 git-tree-sha1 = "dedbbb2ddb876f899585c4ec4433265e3017215a"
 uuid = "dce04be8-c92d-5529-be00-80e4d2c0e197"
diff --git a/test/environments/main/Project.toml b/test/environments/main/Project.toml
index 85df747..88f22ed 100644
--- a/test/environments/main/Project.toml
+++ b/test/environments/main/Project.toml
@@ -1,4 +1,5 @@
 [deps]
+Aqua = "4c88cf16-eb10-579e-8560-4a9242c79595"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 Transducers = "28d57a85-8fef-5791-bfe6-a80928e7c999"
 UnionArrays = "d6dd79e4-993b-11e9-1366-0de1c9fe1122"
diff --git a/test/test_aqua.jl b/test/test_aqua.jl
new file mode 100644
index 0000000..432c3da
--- /dev/null
+++ b/test/test_aqua.jl
@@ -0,0 +1,15 @@
+module TestAqua
+
+import Aqua
+import UnionArrays
+using Test
+
+# Default `Aqua.test_all(UnionArrays)` does not work due to ambiguities
+# in upstream packages.
+Aqua.test_all(UnionArrays; ambiguities = false)
+
+@testset "Method ambiguity" begin
+    Aqua.test_ambiguities(UnionArrays)
+end
+
+end  # module