diff --git a/nimterop/conan.nim b/nimterop/conan.nim
index ee74141..cc060f8 100644
--- a/nimterop/conan.nim
+++ b/nimterop/conan.nim
@@ -1,4 +1,9 @@
-import json, os, strformat, strutils, tables
+import os, strformat, strutils, tables
+
+when (NimMajor, NimMinor, NimPatch) < (1, 2, 0):
+  import marshal
+else:
+  import json
 
 type
   ConanPackage* = ref object
@@ -272,10 +277,13 @@ proc loadConanInfo*(outdir: string): ConanPackage =
     file = outdir / conanInfo
 
   if fileExists(file):
-    try:
-      result = to(readFile(file).parseJson(), ConanPackage)
-    except:
-      discard
+    when (NimMajor, NimMinor, NimPatch) < (1, 2, 0):
+      result = to[ConanPackage](readFile(file))
+    else:
+      try:
+        result = to(readFile(file).parseJson(), ConanPackage)
+      except:
+        discard
 
 proc saveConanInfo*(pkg: ConanPackage, outdir: string) =
   ## Save downloaded package info to `outdir/conaninfo.json`
@@ -283,7 +291,10 @@ proc saveConanInfo*(pkg: ConanPackage, outdir: string) =
   let
     file = outdir / conanInfo
 
-  writeFile(file, $(%pkg))
+  when (NimMajor, NimMinor, NimPatch) < (1, 2, 0):
+    writeFile(file, $$pkg)
+  else:
+    writeFile(file, $(%pkg))
 
 proc parseConanManifest(pkg: ConanPackage, outdir: string) =
   # Get all library info from downloaded conan package
diff --git a/nimterop/jbb.nim b/nimterop/jbb.nim
index b5e66fb..c282197 100644
--- a/nimterop/jbb.nim
+++ b/nimterop/jbb.nim
@@ -1,5 +1,8 @@
 import json, os, strutils
 
+when (NimMajor, NimMinor, NimPatch) < (1, 2, 0):
+  import marshal
+
 type
   JBBPackage* = ref object
     ## JBBPackage type that stores package information
@@ -143,10 +146,13 @@ proc loadJBBInfo*(outdir: string): JBBPackage =
     file = outdir / jbbInfo
 
   if fileExists(file):
-    try:
-      result = to(readFile(file).parseJson(), JBBPackage)
-    except:
-      discard
+    when (NimMajor, NimMinor, NimPatch) < (1, 2, 0):
+      result = to[JBBPackage](readFile(file))
+    else:
+      try:
+        result = to(readFile(file).parseJson(), JBBPackage)
+      except:
+        discard
 
 proc saveJBBInfo*(pkg: JBBPackage, outdir: string) =
   ## Save downloaded package info to `outdir/jbbinfo.json`
@@ -154,7 +160,10 @@ proc saveJBBInfo*(pkg: JBBPackage, outdir: string) =
   let
     file = outdir / jbbInfo
 
-  writeFile(file, $(%pkg))
+  when (NimMajor, NimMinor, NimPatch) < (1, 2, 0):
+    writeFile(file, $$pkg)
+  else:
+    writeFile(file, $(%pkg))
 
 proc dlJBBRequires*(pkg: JBBPackage, outdir: string)
 proc downloadJBB*(pkg: JBBPackage, outdir: string, main = true) =