diff --git a/build.zig b/build.zig
index 9083f31..df488c8 100644
--- a/build.zig
+++ b/build.zig
@@ -126,6 +126,7 @@ const boost_libs = [_][]const u8{
     "tti",
     "bloom",
     "openmethod",
+    "lambda",
 };
 
 pub fn build(b: *std.Build) !void {
diff --git a/build.zig.zon b/build.zig.zon
index bf802c7..3b341cd 100644
--- a/build.zig.zon
+++ b/build.zig.zon
@@ -508,6 +508,10 @@
             .url = "git+https://github.com/boostorg/openmethod#boost-1.91.0",
             .hash = "N-V-__8AAHfqSQBgEvkngqbxyXbdRwXNi1QzyJM--ItiQL9z",
         },
+        .lambda = .{
+            .url = "git+https://github.com/boostorg/lambda#boost-1.91.0",
+            .hash = "N-V-__8AAOZmDABiJmZD1HOoyz8A7KWOd9qeMux49xdFhbVC",
+        },
     },
     .paths = .{""},
 }
diff --git a/update_zon.zig b/update_zon.zig
index 2a70981..1dca5bd 100644
--- a/update_zon.zig
+++ b/update_zon.zig
@@ -172,4 +172,5 @@ const git_urls = [_][]const u8{
     "git+https://github.com/boostorg/tti#" ++ boost_version,
     "git+https://github.com/boostorg/bloom#" ++ boost_version,
     "git+https://github.com/boostorg/openmethod#" ++ boost_version,
+    "git+https://github.com/boostorg/lambda#" ++ boost_version,
 };