diff --git a/src/Main.hs b/apps/smp-server/Main.hs
similarity index 100%
rename from src/Main.hs
rename to apps/smp-server/Main.hs
diff --git a/package.yaml b/package.yaml
index 9c0bf214a..673a09b70 100644
--- a/package.yaml
+++ b/package.yaml
@@ -14,27 +14,29 @@ extra-source-files:
 dependencies:
   - base >= 4.7 && < 5
   - base64-bytestring >= 1.0 && < 1.3
-  - bytestring
+  - bytestring == 0.10.*
   - containers
   - cryptonite == 0.26.*
   - iso8601-time == 0.1.*
   - mtl
-  - network
+  - network == 3.1.*
   - stm
   - time == 1.9.*
-  - unliftio-core
-  - unliftio
-
-executables:
-  simplex-messaging:
-    source-dirs: src
-    main: Main.hs
-    ghc-options:
-      - -threaded
+  - unliftio == 0.2.*
+  - unliftio-core == 0.1.*
 
 library:
   source-dirs: src
 
+executables:
+  smp-server:
+    source-dirs: apps/smp-server
+    main: Main.hs
+    dependencies:
+      - simplex-messaging
+    ghc-options:
+      - -threaded
+
 tests:
   smp-server-test:
     source-dirs: tests