diff --git a/Cargo.lock b/Cargo.lock
index 582b5a763e6f7..70fda1e12e7dd 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -5153,8 +5153,7 @@ dependencies = [
 [[package]]
 name = "thin-vec"
 version = "0.2.13"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a38c90d48152c236a3ab59271da4f4ae63d678c5d7ad6b7714d7cb9760be5e4b"
+source = "git+https://github.com/GnomedDev/thin-vec?branch=outline-capacity-overflow#3f61c4016972cf641c1dff6593e6e87ec94f0f59"
 
 [[package]]
 name = "thiserror"
diff --git a/compiler/rustc_ast/Cargo.toml b/compiler/rustc_ast/Cargo.toml
index 34c612dac692b..58c6153e41270 100644
--- a/compiler/rustc_ast/Cargo.toml
+++ b/compiler/rustc_ast/Cargo.toml
@@ -15,6 +15,6 @@ rustc_macros = { path = "../rustc_macros" }
 rustc_serialize = { path = "../rustc_serialize" }
 rustc_span = { path = "../rustc_span" }
 smallvec = { version = "1.8.1", features = ["union", "may_dangle"] }
-thin-vec = "0.2.12"
+thin-vec = { git = "https://github.com/GnomedDev/thin-vec", branch = "outline-capacity-overflow" }
 tracing = "0.1"
 # tidy-alphabetical-end
diff --git a/compiler/rustc_ast_lowering/Cargo.toml b/compiler/rustc_ast_lowering/Cargo.toml
index 8cc4521e0a78d..0c9b18de56ed3 100644
--- a/compiler/rustc_ast_lowering/Cargo.toml
+++ b/compiler/rustc_ast_lowering/Cargo.toml
@@ -21,6 +21,6 @@ rustc_session = { path = "../rustc_session" }
 rustc_span = { path = "../rustc_span" }
 rustc_target = { path = "../rustc_target" }
 smallvec = { version = "1.8.1", features = ["union", "may_dangle"] }
-thin-vec = "0.2.12"
+thin-vec = { git = "https://github.com/GnomedDev/thin-vec", branch = "outline-capacity-overflow" }
 tracing = "0.1"
 # tidy-alphabetical-end
diff --git a/compiler/rustc_ast_passes/Cargo.toml b/compiler/rustc_ast_passes/Cargo.toml
index eace5ce820892..9cec16cb7c0aa 100644
--- a/compiler/rustc_ast_passes/Cargo.toml
+++ b/compiler/rustc_ast_passes/Cargo.toml
@@ -18,5 +18,5 @@ rustc_parse = { path = "../rustc_parse" }
 rustc_session = { path = "../rustc_session" }
 rustc_span = { path = "../rustc_span" }
 rustc_target = { path = "../rustc_target" }
-thin-vec = "0.2.12"
+thin-vec = { git = "https://github.com/GnomedDev/thin-vec", branch = "outline-capacity-overflow" }
 # tidy-alphabetical-end
diff --git a/compiler/rustc_ast_pretty/Cargo.toml b/compiler/rustc_ast_pretty/Cargo.toml
index 9ae5c9b3cec6c..4e42ed84caeeb 100644
--- a/compiler/rustc_ast_pretty/Cargo.toml
+++ b/compiler/rustc_ast_pretty/Cargo.toml
@@ -9,5 +9,5 @@ itertools = "0.12"
 rustc_ast = { path = "../rustc_ast" }
 rustc_lexer = { path = "../rustc_lexer" }
 rustc_span = { path = "../rustc_span" }
-thin-vec = "0.2.12"
+thin-vec = { git = "https://github.com/GnomedDev/thin-vec", branch = "outline-capacity-overflow" }
 # tidy-alphabetical-end
diff --git a/compiler/rustc_builtin_macros/Cargo.toml b/compiler/rustc_builtin_macros/Cargo.toml
index 21b87be4b81d2..98ca703366199 100644
--- a/compiler/rustc_builtin_macros/Cargo.toml
+++ b/compiler/rustc_builtin_macros/Cargo.toml
@@ -26,6 +26,6 @@ rustc_session = { path = "../rustc_session" }
 rustc_span = { path = "../rustc_span" }
 rustc_target = { path = "../rustc_target" }
 smallvec = { version = "1.8.1", features = ["union", "may_dangle"] }
-thin-vec = "0.2.12"
+thin-vec = { git = "https://github.com/GnomedDev/thin-vec", branch = "outline-capacity-overflow" }
 tracing = "0.1"
 # tidy-alphabetical-end
diff --git a/compiler/rustc_codegen_ssa/Cargo.toml b/compiler/rustc_codegen_ssa/Cargo.toml
index 81590674ec7c1..452feac25adee 100644
--- a/compiler/rustc_codegen_ssa/Cargo.toml
+++ b/compiler/rustc_codegen_ssa/Cargo.toml
@@ -38,7 +38,7 @@ rustc_type_ir = { path = "../rustc_type_ir" }
 serde_json = "1.0.59"
 smallvec = { version = "1.8.1", features = ["union", "may_dangle"] }
 tempfile = "3.2"
-thin-vec = "0.2.12"
+thin-vec = { git = "https://github.com/GnomedDev/thin-vec", branch = "outline-capacity-overflow" }
 thorin-dwp = "0.8"
 tracing = "0.1"
 wasm-encoder = "0.216.0"
diff --git a/compiler/rustc_data_structures/Cargo.toml b/compiler/rustc_data_structures/Cargo.toml
index d73cf11ee64d6..aa37bec51d0bb 100644
--- a/compiler/rustc_data_structures/Cargo.toml
+++ b/compiler/rustc_data_structures/Cargo.toml
@@ -24,7 +24,7 @@ rustc_serialize = { path = "../rustc_serialize" }
 smallvec = { version = "1.8.1", features = ["const_generics", "union", "may_dangle"] }
 stacker = "0.1.17"
 tempfile = "3.2"
-thin-vec = "0.2.12"
+thin-vec = { git = "https://github.com/GnomedDev/thin-vec", branch = "outline-capacity-overflow" }
 tracing = "0.1"
 # tidy-alphabetical-end
 
diff --git a/compiler/rustc_expand/Cargo.toml b/compiler/rustc_expand/Cargo.toml
index ce014364b0d01..89288835a1647 100644
--- a/compiler/rustc_expand/Cargo.toml
+++ b/compiler/rustc_expand/Cargo.toml
@@ -25,6 +25,6 @@ rustc_serialize = { path = "../rustc_serialize" }
 rustc_session = { path = "../rustc_session" }
 rustc_span = { path = "../rustc_span" }
 smallvec = { version = "1.8.1", features = ["union", "may_dangle"] }
-thin-vec = "0.2.12"
+thin-vec = { git = "https://github.com/GnomedDev/thin-vec", branch = "outline-capacity-overflow" }
 tracing = "0.1"
 # tidy-alphabetical-end
diff --git a/compiler/rustc_incremental/Cargo.toml b/compiler/rustc_incremental/Cargo.toml
index 46a63b02e8469..ea493e2be767a 100644
--- a/compiler/rustc_incremental/Cargo.toml
+++ b/compiler/rustc_incremental/Cargo.toml
@@ -18,6 +18,6 @@ rustc_middle = { path = "../rustc_middle" }
 rustc_serialize = { path = "../rustc_serialize" }
 rustc_session = { path = "../rustc_session" }
 rustc_span = { path = "../rustc_span" }
-thin-vec = "0.2.12"
+thin-vec = { git = "https://github.com/GnomedDev/thin-vec", branch = "outline-capacity-overflow" }
 tracing = "0.1"
 # tidy-alphabetical-end
diff --git a/compiler/rustc_middle/Cargo.toml b/compiler/rustc_middle/Cargo.toml
index b23589afb5874..0ffcdb49e2cc1 100644
--- a/compiler/rustc_middle/Cargo.toml
+++ b/compiler/rustc_middle/Cargo.toml
@@ -34,7 +34,7 @@ rustc_span = { path = "../rustc_span" }
 rustc_target = { path = "../rustc_target" }
 rustc_type_ir = { path = "../rustc_type_ir" }
 smallvec = { version = "1.8.1", features = ["union", "may_dangle"] }
-thin-vec = "0.2.12"
+thin-vec = { git = "https://github.com/GnomedDev/thin-vec", branch = "outline-capacity-overflow" }
 tracing = "0.1"
 # tidy-alphabetical-end
 
diff --git a/compiler/rustc_parse/Cargo.toml b/compiler/rustc_parse/Cargo.toml
index c59ae48a07d03..07a5d1656b235 100644
--- a/compiler/rustc_parse/Cargo.toml
+++ b/compiler/rustc_parse/Cargo.toml
@@ -17,7 +17,7 @@ rustc_lexer = { path = "../rustc_lexer" }
 rustc_macros = { path = "../rustc_macros" }
 rustc_session = { path = "../rustc_session" }
 rustc_span = { path = "../rustc_span" }
-thin-vec = "0.2.12"
+thin-vec = { git = "https://github.com/GnomedDev/thin-vec", branch = "outline-capacity-overflow" }
 tracing = "0.1"
 unicode-normalization = "0.1.11"
 unicode-width = "0.1.4"
@@ -25,4 +25,3 @@ unicode-width = "0.1.4"
 
 [dev-dependencies]
 termcolor = "1.2"
-
diff --git a/compiler/rustc_query_impl/Cargo.toml b/compiler/rustc_query_impl/Cargo.toml
index 2bb1be22b985d..6f561b094df8d 100644
--- a/compiler/rustc_query_impl/Cargo.toml
+++ b/compiler/rustc_query_impl/Cargo.toml
@@ -16,7 +16,7 @@ rustc_query_system = { path = "../rustc_query_system" }
 rustc_serialize = { path = "../rustc_serialize" }
 rustc_session = { path = "../rustc_session" }
 rustc_span = { path = "../rustc_span" }
-thin-vec = "0.2.12"
+thin-vec = { git = "https://github.com/GnomedDev/thin-vec", branch = "outline-capacity-overflow" }
 tracing = "0.1"
 # tidy-alphabetical-end
 
diff --git a/compiler/rustc_query_system/Cargo.toml b/compiler/rustc_query_system/Cargo.toml
index 2f42fa47728c0..7fb6609a0e3d9 100644
--- a/compiler/rustc_query_system/Cargo.toml
+++ b/compiler/rustc_query_system/Cargo.toml
@@ -20,7 +20,7 @@ rustc_session = { path = "../rustc_session" }
 rustc_span = { path = "../rustc_span" }
 rustc_target = { path = "../rustc_target" }
 smallvec = { version = "1.8.1", features = ["union", "may_dangle"] }
-thin-vec = "0.2.12"
+thin-vec = { git = "https://github.com/GnomedDev/thin-vec", branch = "outline-capacity-overflow" }
 tracing = "0.1"
 # tidy-alphabetical-end
 
diff --git a/compiler/rustc_resolve/Cargo.toml b/compiler/rustc_resolve/Cargo.toml
index b71853b871dc5..8f6a0a8ede6d5 100644
--- a/compiler/rustc_resolve/Cargo.toml
+++ b/compiler/rustc_resolve/Cargo.toml
@@ -25,6 +25,6 @@ rustc_query_system = { path = "../rustc_query_system" }
 rustc_session = { path = "../rustc_session" }
 rustc_span = { path = "../rustc_span" }
 smallvec = { version = "1.8.1", features = ["union", "may_dangle"] }
-thin-vec = "0.2.12"
+thin-vec = { git = "https://github.com/GnomedDev/thin-vec", branch = "outline-capacity-overflow" }
 tracing = "0.1"
 # tidy-alphabetical-end
diff --git a/compiler/rustc_serialize/Cargo.toml b/compiler/rustc_serialize/Cargo.toml
index 8bf98c16361eb..3111b1ebb5329 100644
--- a/compiler/rustc_serialize/Cargo.toml
+++ b/compiler/rustc_serialize/Cargo.toml
@@ -7,7 +7,7 @@ edition = "2021"
 # tidy-alphabetical-start
 indexmap = "2.0.0"
 smallvec = { version = "1.8.1", features = ["union", "may_dangle"] }
-thin-vec = "0.2.12"
+thin-vec = { git = "https://github.com/GnomedDev/thin-vec", branch = "outline-capacity-overflow" }
 # tidy-alphabetical-end
 
 [dev-dependencies]