diff --git a/crates/bashkit/src/builtins/sed.rs b/crates/bashkit/src/builtins/sed.rs
index f1ee18b2..0dac0794 100644
--- a/crates/bashkit/src/builtins/sed.rs
+++ b/crates/bashkit/src/builtins/sed.rs
@@ -515,8 +515,13 @@ fn parse_sed_command(s: &str, extended_regex: bool) -> Result<(Option<Address>,
                 .replace_all(&replacement, r"$${$1}")
                 .to_string();
 
-            // Convert \n → newline, \t → tab in replacement
-            let replacement = replacement.replace("\\n", "\n").replace("\\t", "\t");
+            // Convert \n → newline, \t → tab, \/ → /, \\ → \ in replacement
+            let replacement = replacement
+                .replace("\\\\", "\x01") // Temporarily escape literal \\
+                .replace("\\n", "\n")
+                .replace("\\t", "\t")
+                .replace("\\/", "/")
+                .replace("\x01", "\\"); // Restore literal backslash
 
             // Parse nth occurrence from flags (e.g., "2" in s/a/b/2)
             let nth = flags
diff --git a/crates/bashkit/tests/spec_cases/sed/sed.test.sh b/crates/bashkit/tests/spec_cases/sed/sed.test.sh
index 246ad11b..198234a3 100644
--- a/crates/bashkit/tests/spec_cases/sed/sed.test.sh
+++ b/crates/bashkit/tests/spec_cases/sed/sed.test.sh
@@ -552,3 +552,24 @@ BAR
 BAR
 baz
 ### end
+
+### sed_unescape_slash_in_replacement
+# \/ in replacement should produce literal /
+echo "abc" | sed 's/b/\//'
+### expect
+a/c
+### end
+
+### sed_regex_groups_with_slash
+# back-references with \/ in replacement
+echo "2026-01-15" | sed 's/\([0-9]*\)-\([0-9]*\)-\([0-9]*\)/\3\/\2\/\1/'
+### expect
+15/01/2026
+### end
+
+### sed_escaped_backslash_in_replacement
+# \\ in replacement should produce literal backslash
+echo "abc" | sed 's/b/\\/'
+### expect
+a\c
+### end
diff --git a/supply-chain/config.toml b/supply-chain/config.toml
index 804ca15c..07fc290e 100644
--- a/supply-chain/config.toml
+++ b/supply-chain/config.toml
@@ -579,7 +579,7 @@ version = "1.2.1"
 criteria = "safe-to-deploy"
 
 [[exemptions.indexmap]]
-version = "2.13.0"
+version = "2.13.1"
 criteria = "safe-to-deploy"
 
 [[exemptions.insta]]