diff --git a/nix_actor.nimble b/nix_actor.nimble
index 24d40cd..6443b42 100644
--- a/nix_actor.nimble
+++ b/nix_actor.nimble
@@ -1,4 +1,4 @@
-version = "20230730"
+version = "20230824"
 author = "Emery Hemingway"
 description = "Syndicated Nix Actor"
 license = "Unlicense"
diff --git a/shell.nix b/shell.nix
index 5d68567..00ec36d 100644
--- a/shell.nix
+++ b/shell.nix
@@ -1,4 +1,4 @@
 let
-  flake = builtins.getFlake "syndicate";
+  flake = builtins.getFlake "/home/emery/src/syndicate-flake";
   pkgs = import <nixpkgs> { overlays = [ flake.overlays.default ]; };
-in pkgs.nix_actor
+in pkgs.nim2Packages.nix_actor
diff --git a/src/nix_actor.nim b/src/nix_actor.nim
index faa3591..aada02b 100644
--- a/src/nix_actor.nim
+++ b/src/nix_actor.nim
@@ -143,36 +143,42 @@ type
   DaemonSideArgs {.preservesDictionary.} = object
     `daemon-socket`: string
 
-main.initNix()
-libexpr.initGC()
+proc runNixActor(nixState: EvalState) =
+  let erisStore = newMemoryStore()
+  runActor("nix_actor") do (root: Cap; turn: var Turn):
+    connectStdio(root, turn)
 
-runActor("main") do (root: Cap; turn: var Turn):
-  let
-    erisStore = newMemoryStore()
-    nixStore = openStore()
-    nixState = newEvalState(nixStore)
-  connectStdio(root, turn)
+    let pat = ?CapArgs
+    during(turn, root, pat) do (ds: Cap):
 
-  during(turn, root, ?CapArgs) do (ds: Cap):
-    discard publish(turn, ds,
-      initRecord("nixVersion", toPreserve($nixVersion.c_str)))
+      discard publish(turn, ds,
+        initRecord("nixVersion", toPreserve($nixVersion.c_str)))
 
-    discard bootNixFacet(turn, ds)
+      discard bootNixFacet(turn, ds)
 
-    during(turn, ds, ?Observe(pattern: !Eval) ?? {0: grabLit(), 1: grabDict()}) do (e: string, o: Assertion):
-      var ass = Eval(expr: e)
-      doAssert fromPreserve(ass.options, unpackLiterals(o))
-        # unused options
-      try:
-        ass.result = eval(nixState, ass.expr)
-        discard publish(turn, ds, ass)
-      except CatchableError as err:
-        stderr.writeLine "failed to evaluate ", ass.expr, ": ", err.msg
-      except StdException as err:
-        stderr.writeLine "failed to evaluate ", ass.expr, ": ", err.what
+      let pat = ?Observe(pattern: !Eval) ?? {0: grabLit(), 1: grabDict()}
+      during(turn, ds, pat) do (e: string, o: Assertion):
+        var ass = Eval(expr: e)
+        doAssert fromPreserve(ass.options, unpackLiterals(o))
+          # unused options
+        try:
+          ass.result = eval(nixState, ass.expr)
+          discard publish(turn, ds, ass)
+        except CatchableError as err:
+          stderr.writeLine "failed to evaluate ", ass.expr, ": ", err.msg
+        except StdException as err:
+          stderr.writeLine "failed to evaluate ", ass.expr, ": ", err.what
 
-    during(turn, root, ?ClientSideArgs) do (socketPath: string):
-      bootClientSide(turn, ds, erisStore, socketPath)
+      during(turn, root, ?ClientSideArgs) do (socketPath: string):
+        bootClientSide(turn, ds, erisStore, socketPath)
 
-    during(turn, root, ?DaemonSideArgs) do (socketPath: string):
-      bootDaemonSide(turn, ds, erisStore, socketPath)
+      during(turn, root, ?DaemonSideArgs) do (socketPath: string):
+        bootDaemonSide(turn, ds, erisStore, socketPath)
+
+proc main =
+  initNix()
+  initGC()
+  let nixStore = openStore()
+  runNixActor(newEvalState(nixStore))
+
+main()
diff --git a/src/nix_actor/libnix/libexpr.nim b/src/nix_actor/libnix/libexpr.nim
index 0608dd5..d98e200 100644
--- a/src/nix_actor/libnix/libexpr.nim
+++ b/src/nix_actor/libnix/libexpr.nim
@@ -83,11 +83,11 @@ type
   ExprObj {.importcpp: "nix::Expr", header: "nixexpr.hh".} = object
     discard
   Expr* = ptr ExprObj
-  EvalState* {.importcpp: "nix::ref<nix::EvalState>", header: "eval.hh".} = object
+  EvalState* {.importcpp: "std::shared_ptr<nix::EvalState>", header: "eval.hh".} = object
     discard
 
 proc newEvalState*(store: Store): EvalState {.
-  importcpp: "nix::newEvalState(@)", header: "seepuspus.hh".}
+  importcpp: "nix::newEvalState(@)", header: "seepuspus.hh", constructor.}
 
 proc parseExprFromString*(state: EvalState; s, basePath: cstring): Expr {.
   importcpp: "#->parseExprFromString(@)".}
diff --git a/src/nix_actor/libnix/seepuspus.hh b/src/nix_actor/libnix/seepuspus.hh
index 0fef838..f1ca694 100644
--- a/src/nix_actor/libnix/seepuspus.hh
+++ b/src/nix_actor/libnix/seepuspus.hh
@@ -3,7 +3,7 @@
 
 namespace nix {
 
-  ref<EvalState> newEvalState(ref<Store> store)
+  std::shared_ptr<nix::EvalState> newEvalState(ref<Store> store)
   {
     auto searchPath = Strings();
     auto evalState =
@@ -15,7 +15,7 @@ namespace nix {
           searchPath, store, store)
       #endif
         ;
-    return ref<EvalState>(evalState);
+    return evalState;
   }
 
 }