diff --git a/CHANGELOG.md b/CHANGELOG.md
index 83f54ee..e60df88 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -22,12 +22,16 @@ Please file a bug if you notice a violation of semantic versioning.
 
 ### Changed
 
+- auth-sanitizer v0.1.3
+
 ### Deprecated
 
 ### Removed
 
 ### Fixed
 
+- Load `auth-sanitizer` through an internal isolated loader so requiring `oauth/tty` does not add top-level `Auth` or `AuthSanitizer` constants that may collide with downstream applications.
+
 ### Security
 
 ## [1.0.7] - 2026-05-16
diff --git a/Gemfile.lock b/Gemfile.lock
index a19a0dc..b3a56de 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,8 +1,8 @@
 PATH
   remote: .
   specs:
-    oauth-tty (1.0.7)
-      auth-sanitizer (~> 0.1)
+    oauth-tty (1.0.8)
+      auth-sanitizer (~> 0.1, >= 0.1.3)
       cgi
       version_gem (~> 1.1, >= 1.1.9)
 
@@ -17,7 +17,7 @@ GEM
       rake (>= 10)
       thor (>= 0.14)
     ast (2.4.3)
-    auth-sanitizer (0.1.2)
+    auth-sanitizer (0.1.3)
       version_gem (~> 1.1, >= 1.1.9)
     backports (3.25.3)
     base64 (0.3.0)
@@ -99,7 +99,7 @@ GEM
       rdoc (>= 4.0.0)
       reline (>= 0.4.2)
     json (2.19.5)
-    kettle-dev (1.2.4)
+    kettle-dev (2.0.0)
     kettle-soup-cover (1.1.1)
       simplecov (~> 0.22)
       simplecov-cobertura (~> 3.0)
@@ -151,10 +151,12 @@ GEM
       racc (~> 1.4)
     nokogiri (1.19.3-x86_64-linux-musl)
       racc (~> 1.4)
-    oauth (1.1.3)
+    oauth (1.1.4)
+      auth-sanitizer (~> 0.1, >= 0.1.2)
       base64 (~> 0.1)
-      oauth-tty (~> 1.0, >= 1.0.6)
-      snaky_hash (~> 2.0)
+      cgi
+      oauth-tty (~> 1.0, >= 1.0.7)
+      snaky_hash (~> 2.0, >= 2.0.4)
       version_gem (~> 1.1, >= 1.1.9)
     ostruct (0.6.3)
     parallel (1.28.0)
@@ -302,7 +304,7 @@ GEM
     simplecov-rcov (0.3.7)
       simplecov (>= 0.4.1)
     simplecov_json_formatter (0.1.4)
-    snaky_hash (2.0.3)
+    snaky_hash (2.0.4)
       hashie (>= 0.1.0, < 6)
       version_gem (>= 1.1.8, < 3)
     standard (1.54.0)
@@ -354,7 +356,7 @@ GEM
       yard
     yard-relative_markdown_links (0.5.0)
       nokogiri (>= 1.14.3, < 2)
-    zeitwerk (2.7.5)
+    zeitwerk (2.8.1)
     zlib (3.2.3)
 
 PLATFORMS
@@ -368,18 +370,18 @@ PLATFORMS
   x86_64-linux-musl
 
 DEPENDENCIES
-  appraisal2 (~> 3.0)
+  appraisal2 (~> 3.0, >= 3.0.6)
   backports (~> 3.25, >= 3.25.1)
   benchmark (~> 0.4, >= 0.4.1)
-  bundler-audit (~> 0.9.2)
+  bundler-audit (~> 0.9.3)
   debug (>= 1.1)
   erb (~> 5.0)
   gem_bench (~> 2.0, >= 2.0.5)
   gitmoji-regex (~> 1.0, >= 1.0.3)
   irb (~> 1.15, >= 1.15.2)
-  kettle-dev (~> 1.1)
+  kettle-dev (~> 2.0)
   kettle-soup-cover (~> 1.0, >= 1.0.10)
-  kettle-test (~> 1.0)
+  kettle-test (~> 1.0, >= 1.0.10)
   kramdown (~> 2.5, >= 2.5.1)
   kramdown-parser-gfm (~> 1.1)
   mocha (~> 3.0)
@@ -393,7 +395,7 @@ DEPENDENCIES
   reek (~> 6.5)
   require_bench (~> 1.0, >= 1.0.4)
   rest-client (~> 2.1)
-  rspec-pending_for (~> 0.0, >= 0.0.17)
+  rspec-pending_for (~> 0.1, >= 0.1.20)
   rubocop-lts (~> 10.0)
   rubocop-on-rbs (~> 1.8)
   rubocop-packaging (~> 0.6, >= 0.6.0)
@@ -401,7 +403,7 @@ DEPENDENCIES
   rubocop-ruby2_3
   ruby-progressbar (~> 1.13)
   standard (>= 1.50)
-  stone_checksums (~> 1.0, >= 1.0.2)
+  stone_checksums (~> 1.0, >= 1.0.3)
   stringio (>= 3.0)
   typhoeus (>= 0.1.13)
   vcr (>= 4)
@@ -415,7 +417,7 @@ CHECKSUMS
   ansi (1.6.0) sha256=ac9ea0c0ea8d32fb4e271348e609963ac78882f34b73836c2a02b3622e666658
   appraisal2 (3.0.6) sha256=09387896b6c8c8c0ff0749af691ddff5e3168de2f06b591a80d8fd8b6394d147
   ast (2.4.3) sha256=954615157c1d6a382bc27d690d973195e79db7f55e9765ac7c481c60bdb4d383
-  auth-sanitizer (0.1.2) sha256=29f7638d74b2a19ff890008f1561165668a78969a4d90bc85e991128825a7c03
+  auth-sanitizer (0.1.3) sha256=51002d96e921eb9610b197f39de92ae63df11eeb3c5f2bfd7829feb725911487
   backports (3.25.3) sha256=94298d32dc3c40ca15633b54e282780b49e2db0c045f602ea1907e4f63a17235
   base64 (0.3.0) sha256=27337aeabad6ffae05c265c450490628ef3ebd4b67be58257393227588f5a97b
   benchmark (0.5.0) sha256=465df122341aedcb81a2a24b4d3bd19b6c67c1530713fd533f3ff034e419236c
@@ -457,7 +459,7 @@ CHECKSUMS
   io-console (0.8.2) sha256=d6e3ae7a7cc7574f4b8893b4fca2162e57a825b223a177b7afa236c5ef9814cc
   irb (1.18.0) sha256=de9454a0703a54704b9811a5ef31a60c86949fbf4013fcf244fabc7c775248e3
   json (2.19.5) sha256=218a18553e4801d579ca7e0f5bc72bafd776d7397238a1fb4e74db5b0a812c59
-  kettle-dev (1.2.4) sha256=71373c67fe7eb0a9656e70dfd10cf226a15083b6d1be18dafcb5360f21ee98b6
+  kettle-dev (2.0.0) sha256=f3cd1a2f8cc4f1fcc573d7e9177644873cfdfe455e26365416b4290ea09490b5
   kettle-soup-cover (1.1.1) sha256=2303885a9d8485d8d43cb250bcf73570f6b6fb997526beeaef3ef54e3501d445
   kettle-test (1.0.10) sha256=ddefc5d54b290ee6dbe5a3983128f6948fa63f624ca676c1e6cfffc9b6878179
   kramdown (2.5.2) sha256=1ba542204c66b6f9111ff00dcc26075b95b220b07f2905d8261740c82f7f02fa
@@ -478,8 +480,8 @@ CHECKSUMS
   nokogiri (1.19.3-x86_64-darwin) sha256=77f3fba57d46c53ab31e62fc6c28f705109d1bf6264356c76f132b2be5728d4d
   nokogiri (1.19.3-x86_64-linux-gnu) sha256=2f5078620fe12e83669b5b17311b32532a8153d02eee7ad06948b926d6080976
   nokogiri (1.19.3-x86_64-linux-musl) sha256=248c906d2166eca5efb56d52fdee5f9a1f51d69a72e2b64fdac647b4ce39ea3f
-  oauth (1.1.3) sha256=71ca1b534561bf31a9b2aee01147384064b555e796d1a0fe2591806bb4bdd633
-  oauth-tty (1.0.7)
+  oauth (1.1.4) sha256=dc836253efa583054fa443ab41bafe70fd24498b4157eb524e5c3a45b5f10d0b
+  oauth-tty (1.0.8)
   ostruct (0.6.3) sha256=95a2ed4a4bd1d190784e666b47b2d3f078e4a9efda2fccf18f84ddc6538ed912
   parallel (1.28.0) sha256=33e6de1484baf2524792d178b0913fc8eb94c628d6cfe45599ad4458c638c970
   parser (3.3.11.1) sha256=d17ace7aabe3e72c3cc94043714be27cc6f852f104d81aa284c2281aecc65d54
@@ -535,7 +537,7 @@ CHECKSUMS
   simplecov-lcov (0.9.0) sha256=7a77a31e200a595ed4b0249493056efd0c920601f53d2ef135ca34ee796346cd
   simplecov-rcov (0.3.7) sha256=372f50bf6df6b6350b7d0c840f2f8bdabe021861a43c26877b747c9ac96139fc
   simplecov_json_formatter (0.1.4) sha256=529418fbe8de1713ac2b2d612aa3daa56d316975d307244399fa4838c601b428
-  snaky_hash (2.0.3) sha256=25a3d299566e8153fb02fa23fd9a9358845950f7a523ddbbe1fa1e0d79a6d456
+  snaky_hash (2.0.4) sha256=2b12758c57defa6796341a1620f84b1a23737421d8d7e2575d0550b53cc4fece
   standard (1.54.0) sha256=7a4b08f83d9893083c8f03bc486f0feeb6a84d48233b40829c03ef4767ea0100
   standard-custom (1.0.2) sha256=424adc84179a074f1a2a309bb9cf7cd6bfdb2b6541f20c6bf9436c0ba22a652b
   standard-performance (1.9.0) sha256=49483d31be448292951d80e5e67cdcb576c2502103c7b40aec6f1b6e9c88e3f2
@@ -556,7 +558,7 @@ CHECKSUMS
   yard (0.9.43) sha256=cf8733a8f0485df2a162927e9b5f182215a61f6d22de096b8f402c726a1c5821
   yard-junk (0.1.0) sha256=e85fe2ec1afa47313decd333447b53458cb1ed49b510b70015fdc3041a94bcdd
   yard-relative_markdown_links (0.5.0) sha256=d5158786196bfb82ed8f6880cefea2ef3072cc9e774ecebd7803e0db9bbb3a71
-  zeitwerk (2.7.5) sha256=d8da92128c09ea6ec62c949011b00ed4a20242b255293dd66bf41545398f73dd
+  zeitwerk (2.8.1) sha256=1c85e0f28954d68cd16e575da37f26846f609b68d80b5942ccfd31030c2449d5
   zlib (3.2.3) sha256=5bd316698b32f31a64ab910a8b6c282442ca1626a81bbd6a1674e8522e319c20
 
 BUNDLED WITH
diff --git a/lib/oauth/tty.rb b/lib/oauth/tty.rb
index c6f1f17..2b210f2 100644
--- a/lib/oauth/tty.rb
+++ b/lib/oauth/tty.rb
@@ -5,7 +5,6 @@
 require "optparse"
 
 # external gems
-require "auth/sanitizer"
 require "version_gem"
 
 # For initial release as a standalone gem, this gem must not declare oauth as a dependency,
@@ -15,6 +14,7 @@
 
 # this gem's version
 require_relative "tty/version"
+require_relative "tty/auth_sanitizer"
 
 # Configure version before loading the rest of the library
 OAuth::TTY::Version.class_eval do
diff --git a/lib/oauth/tty/auth_sanitizer.rb b/lib/oauth/tty/auth_sanitizer.rb
new file mode 100644
index 0000000..af7def2
--- /dev/null
+++ b/lib/oauth/tty/auth_sanitizer.rb
@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+module OAuth
+  module TTY
+    AUTH_SANITIZER = begin
+      auth_sanitizer_requirement = Gem::Requirement.new("~> 0.1", ">= 0.1.3")
+      auth_sanitizer_spec = Gem.loaded_specs["auth-sanitizer"]
+      unless auth_sanitizer_spec && auth_sanitizer_requirement.satisfied_by?(auth_sanitizer_spec.version)
+        auth_sanitizer_spec = Gem::Specification.find_by_name("auth-sanitizer", auth_sanitizer_requirement)
+      end
+
+      auth_sanitizer_loader_path = File.join(
+        auth_sanitizer_spec.full_gem_path,
+        "lib/auth_sanitizer/loader.rb",
+      )
+      unless File.file?(auth_sanitizer_loader_path)
+        raise LoadError, "oauth-tty requires auth-sanitizer #{auth_sanitizer_requirement}; " \
+          "loader not found at #{auth_sanitizer_loader_path}"
+      end
+
+      auth_sanitizer_loader_namespace = Module.new
+      auth_sanitizer_loader_namespace.module_eval(
+        File.read(auth_sanitizer_loader_path),
+        auth_sanitizer_loader_path,
+        1,
+      )
+
+      auth_sanitizer_loader_namespace
+        .const_get(:AuthSanitizer)
+        .const_get(:Loader)
+        .load_isolated
+    end
+  end
+end
diff --git a/lib/oauth/tty/command.rb b/lib/oauth/tty/command.rb
index bf0da9e..ea5cde4 100644
--- a/lib/oauth/tty/command.rb
+++ b/lib/oauth/tty/command.rb
@@ -4,11 +4,11 @@ module OAuth
   module TTY
     # Base class for oauth-tty commands.
     #
-    # Includes {Auth::Sanitizer::FilteredAttributes} so inspect output redacts
+    # Includes {OAuth::TTY::AUTH_SANITIZER::FilteredAttributes} so inspect output redacts
     # the accumulated command options hash, which may contain consumer or token
     # secrets read from CLI flags or option files.
     class Command
-      include Auth::Sanitizer::FilteredAttributes
+      include OAuth::TTY::AUTH_SANITIZER::FilteredAttributes
 
       # Redact parser-related state from inspect output because it can include
       # credential-bearing CLI arguments and parser internals that retain them.
diff --git a/lib/oauth/tty/version.rb b/lib/oauth/tty/version.rb
index 5411c52..747a652 100644
--- a/lib/oauth/tty/version.rb
+++ b/lib/oauth/tty/version.rb
@@ -3,7 +3,7 @@
 module OAuth
   module TTY
     module Version
-      VERSION = "1.0.7"
+      VERSION = "1.0.8"
     end
     VERSION = Version::VERSION # Traditional Constant Location
   end
diff --git a/oauth-tty.gemspec b/oauth-tty.gemspec
index 7949300..f5d775f 100644
--- a/oauth-tty.gemspec
+++ b/oauth-tty.gemspec
@@ -98,7 +98,7 @@ Gem::Specification.new do |spec|
   spec.add_dependency("cgi", ">= 0")
 
   # Utilities
-  spec.add_dependency("auth-sanitizer", "~> 0.1")
+  spec.add_dependency("auth-sanitizer", "~> 0.1", ">= 0.1.3")           # ruby >= 2.2.0
   spec.add_dependency("version_gem", "~> 1.1", ">= 1.1.9")              # ruby >= 2.2.0
 
   # NOTE: It is preferable to list development dependencies in the gemspec due to increased
@@ -115,10 +115,10 @@ Gem::Specification.new do |spec|
   #       and preferably a modular one (see gemfiles/modular/*.gemfile).
 
   # Dev, Test, & Release Tasks
-  spec.add_development_dependency("kettle-dev", "~> 1.1")                     # ruby >= 2.3.0
+  spec.add_development_dependency("kettle-dev", "~> 2.0")                     # ruby >= 2.3.0
 
   # Security
-  spec.add_development_dependency("bundler-audit", "~> 0.9.2")                      # ruby >= 2.0.0
+  spec.add_development_dependency("bundler-audit", "~> 0.9.3")                      # ruby >= 2.0.0
 
   # Tasks
   spec.add_development_dependency("rake", "~> 13.0")                                # ruby >= 2.2.0
@@ -127,18 +127,18 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency("require_bench", "~> 1.0", ">= 1.0.4")            # ruby >= 2.2.0
 
   # Testing
-  spec.add_development_dependency("appraisal2", "~> 3.0")                           # ruby >= 1.8.7, for testing against multiple versions of dependencies
-  spec.add_development_dependency("kettle-test", "~> 1.0")                          # ruby >= 2.3
+  spec.add_development_dependency("appraisal2", "~> 3.0", ">= 3.0.6")               # ruby >= 1.8.7, for testing against multiple versions of dependencies
+  spec.add_development_dependency("kettle-test", "~> 1.0", ">= 1.0.10")             # ruby >= 2.3
   spec.add_development_dependency("mocha", "~> 3.0")
   spec.add_development_dependency("rack", "~> 2.0")
   spec.add_development_dependency("rack-test", "~> 2.0")
   spec.add_development_dependency("rest-client", "~> 2.1")
-  spec.add_development_dependency("rspec-pending_for", "~> 0.0", ">= 0.0.17")       # ruby >= 2.3, used to skip specs on incompatible Rubies
+  spec.add_development_dependency("rspec-pending_for", "~> 0.1", ">= 0.1.20")       # ruby >= 2.3, used to skip specs on incompatible Rubies
   spec.add_development_dependency("typhoeus", ">= 0.1.13")
 
   # Releasing
   spec.add_development_dependency("ruby-progressbar", "~> 1.13")                    # ruby >= 0
-  spec.add_development_dependency("stone_checksums", "~> 1.0", ">= 1.0.2")          # ruby >= 2.2.0
+  spec.add_development_dependency("stone_checksums", "~> 1.0", ">= 1.0.3")          # ruby >= 2.2.0
 
   # Git integration (optional)
   # The 'git' gem is optional; oauth-tty falls back to shelling out to `git` if it is not present.
diff --git a/sig/oauth/tty/command.rbs b/sig/oauth/tty/command.rbs
index 0891ece..6541788 100644
--- a/sig/oauth/tty/command.rbs
+++ b/sig/oauth/tty/command.rbs
@@ -1,7 +1,7 @@
 module OAuth
   module TTY
     class Command
-      include Auth::Sanitizer::FilteredAttributes
+      include OAuth::TTY::AUTH_SANITIZER::FilteredAttributes
 
       def initialize: (untyped stdout, untyped stdin, untyped stderr, untyped arguments) -> void
       def run: () -> untyped
diff --git a/spec/oauth/tty/auth_sanitizer_spec.rb b/spec/oauth/tty/auth_sanitizer_spec.rb
new file mode 100644
index 0000000..964c614
--- /dev/null
+++ b/spec/oauth/tty/auth_sanitizer_spec.rb
@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+RSpec.describe "OAuth::TTY::AUTH_SANITIZER" do
+  it "provides filtered attributes for OAuth::TTY commands" do
+    expect(OAuth::TTY::Command.ancestors).to include(OAuth::TTY::AUTH_SANITIZER::FilteredAttributes)
+  end
+end