diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+# v2.0.0.1
+
+Support for `pqi-1.1`.
+
 # v2.0.0.0
 
 New era: the transport layer is now pluggable via [`pqi`](https://github.com/nikita-volkov/pqi), and an alpha pure-Haskell backend, [`pqi-native`](https://github.com/nikita-volkov/pqi-native), is available for early adopters. Goal: a reliable, performant, no-C-dependency replacement for libpq.
diff --git a/hasql.cabal b/hasql.cabal
--- a/hasql.cabal
+++ b/hasql.cabal
@@ -1,6 +1,6 @@
 cabal-version: 3.0
 name: hasql
-version: 2.0.0.0
+version: 2.0.0.1
 category: Hasql, Database, PostgreSQL
 synopsis: Fast PostgreSQL driver with a flexible mapping API
 description:
@@ -121,7 +121,7 @@
     hasql:engine,
     hasql:platform,
     postgresql-connection-string ^>=0.1,
-    pqi ^>=1.0,
+    pqi >=1.0 && <1.2,
     text >=1 && <3,
     text-builder >=1 && <1.1,
     unordered-containers >=0.2 && <0.3,
@@ -206,7 +206,7 @@
     attoparsec >=0.10 && <0.15,
     bytestring >=0.10 && <0.13,
     hasql:platform,
-    pqi ^>=1.0,
+    pqi >=1.0 && <1.2,
     vector >=0.10 && <0.14,
 
 library engine
@@ -228,7 +228,7 @@
     hasql:comms,
     hasql:platform,
     postgresql-binary ^>=0.15,
-    pqi ^>=1.0,
+    pqi >=1.0 && <1.2,
     text >=1 && <3,
     text-builder >=1 && <1.1,
     unordered-containers >=0.2 && <0.3,
@@ -278,7 +278,7 @@
     hasql:comms,
     hasql:platform,
     hspec ^>=2.11.12,
-    pqi ^>=1.0,
+    pqi >=1.0 && <1.2,
     pqi-ffi ^>=1.0,
     testcontainers-postgresql ^>=0.2,
     text-builder >=1 && <1.1,
@@ -370,7 +370,7 @@
     hasql,
     hspec ^>=2.11.12,
     iproute,
-    pqi ^>=1.0,
+    pqi >=1.0 && <1.2,
     pqi-ffi ^>=1.0,
     pqi-native ^>=1.0,
     QuickCheck,