diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index c8bdf0ac..de0cbe65 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -23,7 +23,7 @@ jobs:
             os: windows,
             shell: msys2
           }
-        nim: [1.6.18]
+        nim: [1.6.18, 2.0.14]
     name: ${{ matrix.platform.icon }} ${{ matrix.platform.label }} - Nim v${{ matrix.nim }}
     runs-on: ${{ matrix.platform.os }}-latest
     steps:
diff --git a/.gitignore b/.gitignore
index 5494ef99..9c524e96 100644
--- a/.gitignore
+++ b/.gitignore
@@ -11,3 +11,4 @@ nimcache
 TODO
 nimble.develop
 nimble.paths
+nimbledeps
diff --git a/config.nims b/config.nims
index ed3a5315..d36ad3f9 100644
--- a/config.nims
+++ b/config.nims
@@ -14,3 +14,7 @@ when (NimMajor, NimMinor) > (1, 2):
 when withDir(thisDir(), system.fileExists("nimble.paths")):
   include "nimble.paths"
 # end Nimble config
+
+when (NimMajor, NimMinor) >= (2, 0):
+  --mm:refc
+
diff --git a/datastore.nimble b/datastore.nimble
index 09c35d81..e00c130e 100644
--- a/datastore.nimble
+++ b/datastore.nimble
@@ -1,7 +1,7 @@
 mode = ScriptMode.Verbose
 
 packageName   = "datastore"
-version       = "0.1.1"
+version       = "0.2.0"
 author        = "Status Research & Development GmbH"
 description   = "Simple, unified API for multiple data stores"
 license       = "Apache License 2.0 or MIT"
@@ -10,10 +10,10 @@ requires "nim >= 1.2.0",
          "asynctest >= 0.5.2 & < 0.6.0",
          "chronos >= 4.0.3 & < 5.0.0",
          "questionable >= 0.10.15 & < 0.11.0",
-         "sqlite3_abi",
-         "leveldbstatic >= 0.1.6",
-         "stew",
-         "unittest2"
+         "sqlite3_abi == 3.47.0.0",
+         "leveldbstatic#0bd875d2b76c5b02c771fc1de136826dae6802c6",
+         "stew >= 0.2.0",
+         "unittest2 >= 0.2.3"
 
 task coverage, "generates code coverage report":
   var (output, exitCode) = gorgeEx("which lcov")
diff --git a/datastore/datastore.nim b/datastore/datastore.nim
index 47f339b1..b038165e 100644
--- a/datastore/datastore.nim
+++ b/datastore/datastore.nim
@@ -16,22 +16,22 @@ type
   Modify* = Function[?seq[byte], Future[?seq[byte]]]
   ModifyGet* = Function[?seq[byte], Future[(?seq[byte], seq[byte])]]
 
-method has*(self: Datastore, key: Key): Future[?!bool] {.base, locks: "unknown".} =
+method has*(self: Datastore, key: Key): Future[?!bool] {.base, gcsafe, locks: "unknown".} =
   raiseAssert("Not implemented!")
 
-method delete*(self: Datastore, key: Key): Future[?!void] {.base, locks: "unknown".} =
+method delete*(self: Datastore, key: Key): Future[?!void] {.base, gcsafe, locks: "unknown".} =
   raiseAssert("Not implemented!")
 
-method delete*(self: Datastore, keys: seq[Key]): Future[?!void] {.base, locks: "unknown".} =
+method delete*(self: Datastore, keys: seq[Key]): Future[?!void] {.base, gcsafe, locks: "unknown".} =
   raiseAssert("Not implemented!")
 
-method get*(self: Datastore, key: Key): Future[?!seq[byte]] {.base, locks: "unknown".} =
+method get*(self: Datastore, key: Key): Future[?!seq[byte]] {.base, gcsafe, locks: "unknown".} =
   raiseAssert("Not implemented!")
 
-method put*(self: Datastore, key: Key, data: seq[byte]): Future[?!void] {.base, locks: "unknown".} =
+method put*(self: Datastore, key: Key, data: seq[byte]): Future[?!void] {.base, gcsafe, locks: "unknown".} =
   raiseAssert("Not implemented!")
 
-method put*(self: Datastore, batch: seq[BatchEntry]): Future[?!void] {.base, locks: "unknown".} =
+method put*(self: Datastore, batch: seq[BatchEntry]): Future[?!void] {.base, gcsafe, locks: "unknown".} =
   raiseAssert("Not implemented!")
 
 method close*(self: Datastore): Future[?!void] {.base, async, locks: "unknown".} =
@@ -46,7 +46,7 @@ method query*(
 proc contains*(self: Datastore, key: Key): Future[bool] {.async.} =
   return (await self.has(key)) |? false
 
-method modify*(self: Datastore, key: Key, fn: Modify): Future[?!void] {.base, locks: "unknown".} =
+method modify*(self: Datastore, key: Key, fn: Modify): Future[?!void] {.base, gcsafe, locks: "unknown".} =
   ## Concurrently safe way of modifying the value associated with the `key`.
   ##
   ## Same as `modifyGet`, but this takes `fn` that doesn't produce any auxillary value.
@@ -54,7 +54,7 @@ method modify*(self: Datastore, key: Key, fn: Modify): Future[?!void] {.base, lo
 
   raiseAssert("Not implemented!")
 
-method modifyGet*(self: Datastore, key: Key, fn: ModifyGet): Future[?!seq[byte]] {.base, locks: "unknown".} =
+method modifyGet*(self: Datastore, key: Key, fn: ModifyGet): Future[?!seq[byte]] {.base, gcsafe, locks: "unknown".} =
   ## Concurrently safe way of updating value associated with the `key`. Returns auxillary value on
   ## successful update.
   ##
diff --git a/datastore/leveldb/leveldbds.nim b/datastore/leveldb/leveldbds.nim
index 30e30f67..afa07ae4 100644
--- a/datastore/leveldb/leveldbds.nim
+++ b/datastore/leveldb/leveldbds.nim
@@ -79,7 +79,7 @@ proc getQueryString(query: Query): string =
   result = $(query.key)
   let toTrim = ["/*", "\\*"]
   for trim in toTrim:
-    if result.endswith(trim):
+    if result.endsWith(trim):
       result = result[0 ..< ^(trim.len)]
 
 method query*(
diff --git a/datastore/mountedds.nim b/datastore/mountedds.nim
index d1c51cd8..5be85110 100644
--- a/datastore/mountedds.nim
+++ b/datastore/mountedds.nim
@@ -20,7 +20,7 @@ type
   MountedDatastore* = ref object of Datastore
     stores*: Table[Key, MountedStore]
 
-method mount*(self: MountedDatastore, key: Key, store: Datastore): ?!void {.base.} =
+method mount*(self: MountedDatastore, key: Key, store: Datastore): ?!void {.base, gcsafe.} =
   ## Mount a store on a namespace - namespaces are only `/`
   ##
 
diff --git a/datastore/sql/sqliteutils.nim b/datastore/sql/sqliteutils.nim
index c86f7071..2103e53b 100644
--- a/datastore/sql/sqliteutils.nim
+++ b/datastore/sql/sqliteutils.nim
@@ -128,7 +128,11 @@ template dispose*(db: SQLite) =
 
 template dispose*(sqliteStmt: SQLiteStmt) =
   doAssert SQLITE_OK == sqlite3_finalize(RawStmtPtr(sqliteStmt))
-  sqliteStmt = nil
+  # nil literals can no longer be directly assigned to variables or fields of distinct pointer types.
+  # They must be converted instead.
+  # See https://nim-lang.org/blog/2022/12/21/version-20-rc.html#:~:text=nil%20literals%20can%20no%20longer%20be%20directly%20assigned%20to%20variables%20or%20fields%20of%20distinct%20pointer%20types.%20They%20must%20be%20converted%20instead.
+  # SQLiteStmt(nil) is generating a SIGSEGV, so we need to cast it
+  sqliteStmt = cast[typeof sqliteStmt](nil)
 
 proc release*[T](x: var AutoDisposed[T]): T =
   result = x.val
@@ -237,7 +241,10 @@ proc query*[P](
 
     case v
     of SQLITE_ROW:
-      onData(s)
+      try:
+        onData(s)
+      except Exception as err:
+        return failure("sqliteutils.query (stmt) exception: " & $err.msg)
       res = success true
     of SQLITE_DONE:
       break
@@ -256,11 +263,14 @@ proc query*(
   query: string,
   onData: DataProc): ?!bool =
 
-  var
-    s = ? NoParamsStmt.prepare(env, query)
-    res = s.query((), onData)
+  var s = ? NoParamsStmt.prepare(env, query)
 
-  # NB: dispose of the prepared query statement and free associated memory
-  s.dispose
+  try:
+    var res = s.query((), onData)
+    return res
+  except Exception as err:
+    return failure("sqliteutils.query (env) exception: " & $err.msg)
+  finally:
+    # NB: dispose of the prepared query statement and free associated memory
+    s.dispose
 
-  res
diff --git a/tests/datastore/leveldb/testleveldbds.nim b/tests/datastore/leveldb/testleveldbds.nim
index 19a7c8e0..49c175d5 100644
--- a/tests/datastore/leveldb/testleveldbds.nim
+++ b/tests/datastore/leveldb/testleveldbds.nim
@@ -25,7 +25,7 @@ suite "Test Basic LevelDbDatastore":
     otherBytes = "some other bytes".toBytes
 
   setupAll:
-    createdir(tempDir)
+    createDir(tempDir)
 
   teardownAll:
     (await ds.close()).tryGet()
@@ -40,7 +40,7 @@ suite "Test LevelDB Query":
   var ds: LevelDbDatastore
 
   setup:
-    createdir(tempDir)
+    createDir(tempDir)
     ds = LevelDbDatastore.new(tempDir).tryGet()
 
   teardown:
@@ -57,7 +57,7 @@ suite "Test LevelDB Typed Query":
   var ds: LevelDbDatastore
 
   setup:
-    createdir(tempDir)
+    createDir(tempDir)
     ds = LevelDbDatastore.new(tempDir).tryGet()
 
   teardown:
@@ -87,7 +87,7 @@ suite "LevelDB Query: keys should disregard trailing wildcards":
     val3 = "value for 3".toBytes
 
   setup:
-    createdir(tempDir)
+    createDir(tempDir)
     ds = LevelDbDatastore.new(tempDir).tryGet()
     (await ds.put(key1, val1)).tryGet
     (await ds.put(key2, val2)).tryGet