diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
new file mode 100644
index 0000000..3eb4531
--- /dev/null
+++ b/.github/workflows/codeql-analysis.yml
@@ -0,0 +1,31 @@
+name: "CodeQL"
+
+on:
+  push:
+    branches: [master, develop]
+  pull_request:
+    branches: [master]
+  schedule:
+    - cron: '0 16 * * 1,3,5'
+
+jobs:
+  analyse:
+    name: Analyse
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v2
+      with:
+        fetch-depth: 2
+
+    - run: git checkout HEAD^2
+      if: ${{ github.event_name == 'pull_request' }}
+
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v1
+      with:
+        languages: go
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v1
diff --git a/.travis.yml b/.travis.yml
index 7bde6fa..f9acc92 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,8 +1,8 @@
 language: go
 
 go:
-  - 1.13.x
   - 1.14.x
+  - 1.15.x
   - tip
 
 branches:
diff --git a/librato.go b/librato.go
index 061f0d4..3f01e8a 100644
--- a/librato.go
+++ b/librato.go
@@ -22,7 +22,7 @@ import (
 // ////////////////////////////////////////////////////////////////////////////////// //
 
 // VERSION contains current version of librato package and used as part of User-Agent
-const VERSION = "10.0.0"
+const VERSION = "10.0.1"
 
 // ////////////////////////////////////////////////////////////////////////////////// //
 
@@ -520,7 +520,7 @@ func sendingLoop() {
 		now := time.Now().Unix()
 
 		for _, source := range sources {
-			period := timeutil.DurationToSeconds(source.getPeriod())
+			period := int64(timeutil.DurationToSeconds(source.getPeriod()))
 			lastSendTime := source.getLastSendingDate()
 
 			if period == 0 || lastSendTime <= 0 {