diff --git a/frontend/package.json b/frontend/package.json
index ebbb48c3e740..2e74f4d667fd 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -1,6 +1,6 @@
 {
   "name": "streamlit",
-  "version": "1.26.0",
+  "version": "1.26.0.dev1",
   "private": true,
   "workspaces": [
     "app",
diff --git a/lib/setup.py b/lib/setup.py
index 16ab0c045f54..85d2a1bd0ee6 100644
--- a/lib/setup.py
+++ b/lib/setup.py
@@ -21,7 +21,7 @@
 
 THIS_DIRECTORY = Path(__file__).parent
 
-VERSION = "1.26.0"  # PEP-440
+VERSION = "1.26.0.dev1"  # PEP-440
 
 NAME = "streamlit"
 
@@ -58,7 +58,7 @@
     "tenacity>=8.1.0, <9",
     "toml>=0.10.1, <2",
     "typing-extensions>=4.1.0, <5",
-    "tzlocal>=1.1, <5",
+    "tzlocal>=1.1, <6",
     "validators>=0.2, <1",
     # Don't require watchdog on MacOS, since it'll fail without xcode tools.
     # Without watchdog, we fallback to a polling file watcher to check for app changes.