diff --git a/steep/Gemfile b/steep/Gemfile
index 0956766fd..8d03f72fe 100644
--- a/steep/Gemfile
+++ b/steep/Gemfile
@@ -1,4 +1,4 @@
 source "https://rubygems.org"
 
-gem "rbs"
-gem "steep"
+gem "rbs", "~> 3.6.0.pre"
+gem "steep", "~> 1.8.0.pre"
diff --git a/steep/Gemfile.lock b/steep/Gemfile.lock
index 162b2ace4..f58f88bf9 100644
--- a/steep/Gemfile.lock
+++ b/steep/Gemfile.lock
@@ -38,10 +38,10 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.11.1)
       ffi (~> 1.0)
-    rbs (3.5.3)
+    rbs (3.6.0.pre.2)
       logger
     securerandom (0.3.1)
-    steep (1.7.1)
+    steep (1.8.0.pre.2)
       activesupport (>= 5.1)
       concurrent-ruby (>= 1.1.10)
       csv (>= 3.0.9)
@@ -52,7 +52,7 @@ GEM
       logger (>= 1.3.0)
       parser (>= 3.1)
       rainbow (>= 2.2.2, < 4.0)
-      rbs (>= 3.5.0.pre)
+      rbs (~> 3.6.0.pre)
       securerandom (>= 0.1)
       strscan (>= 1.0.0)
       terminal-table (>= 2, < 4)
@@ -67,8 +67,8 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  rbs
-  steep
+  rbs (~> 3.6.0.pre)
+  steep (~> 1.8.0.pre)
 
 BUNDLED WITH
    2.5.16