diff --git a/Cargo.lock b/Cargo.lock
index f48d318242c..58e7171ec19 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -156,7 +156,7 @@ checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
 [[package]]
 name = "chalk"
-version = "0.65.0"
+version = "0.66.0-dev.0"
 dependencies = [
  "chalk-derive",
  "chalk-engine",
@@ -178,7 +178,7 @@ dependencies = [
 
 [[package]]
 name = "chalk-derive"
-version = "0.65.0"
+version = "0.66.0-dev.0"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -188,7 +188,7 @@ dependencies = [
 
 [[package]]
 name = "chalk-engine"
-version = "0.65.0"
+version = "0.66.0-dev.0"
 dependencies = [
  "chalk-derive",
  "chalk-integration",
@@ -200,7 +200,7 @@ dependencies = [
 
 [[package]]
 name = "chalk-integration"
-version = "0.65.0"
+version = "0.66.0-dev.0"
 dependencies = [
  "chalk-derive",
  "chalk-engine",
@@ -215,7 +215,7 @@ dependencies = [
 
 [[package]]
 name = "chalk-ir"
-version = "0.65.0"
+version = "0.66.0-dev.0"
 dependencies = [
  "bitflags",
  "chalk-derive",
@@ -224,7 +224,7 @@ dependencies = [
 
 [[package]]
 name = "chalk-parse"
-version = "0.65.0"
+version = "0.66.0-dev.0"
 dependencies = [
  "lalrpop",
  "lalrpop-util",
@@ -234,7 +234,7 @@ dependencies = [
 
 [[package]]
 name = "chalk-recursive"
-version = "0.65.0"
+version = "0.66.0-dev.0"
 dependencies = [
  "chalk-derive",
  "chalk-integration",
@@ -246,7 +246,7 @@ dependencies = [
 
 [[package]]
 name = "chalk-solve"
-version = "0.65.0"
+version = "0.66.0-dev.0"
 dependencies = [
  "chalk-derive",
  "chalk-integration",
diff --git a/Cargo.toml b/Cargo.toml
index 231864822f6..849bf490328 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "chalk"
-version = "0.65.0"
+version = "0.66.0-dev.0"
 description = "Model of the Rust trait system"
 license = "Apache-2.0/MIT"
 authors = ["Rust Compiler Team", "Chalk developers"]
@@ -21,13 +21,13 @@ salsa = "0.16.0"
 serde = "1.0"
 serde_derive = "1.0"
 
-chalk-derive = { version = "=0.65.0", path = "chalk-derive" }
-chalk-engine = { version = "=0.65.0", path = "chalk-engine" }
-chalk-ir = { version = "=0.65.0", path = "chalk-ir" }
-chalk-solve = { version = "=0.65.0", path = "chalk-solve" }
-chalk-recursive = { version = "=0.65.0", path = "chalk-recursive" }
-chalk-parse = { version = "=0.65.0", path = "chalk-parse" }
-chalk-integration = { version = "=0.65.0", path = "chalk-integration" }
+chalk-derive = { version = "0.66.0-dev.0", path = "chalk-derive" }
+chalk-engine = { version = "0.66.0-dev.0", path = "chalk-engine" }
+chalk-ir = { version = "0.66.0-dev.0", path = "chalk-ir" }
+chalk-solve = { version = "0.66.0-dev.0", path = "chalk-solve" }
+chalk-recursive = { version = "0.66.0-dev.0", path = "chalk-recursive" }
+chalk-parse = { version = "0.66.0-dev.0", path = "chalk-parse" }
+chalk-integration = { version = "0.66.0-dev.0", path = "chalk-integration" }
 
 [workspace]
 
diff --git a/chalk-derive/Cargo.toml b/chalk-derive/Cargo.toml
index c3e49f537c3..5149c236bf6 100644
--- a/chalk-derive/Cargo.toml
+++ b/chalk-derive/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "chalk-derive"
-version = "0.65.0"
+version = "0.66.0-dev.0"
 description = "A helper crate for use by chalk crates for `derive` macros."
 license = "Apache-2.0/MIT"
 authors = ["Rust Compiler Team", "Chalk developers"]
diff --git a/chalk-engine/Cargo.toml b/chalk-engine/Cargo.toml
index 6bcf83db2eb..61e0d1205df 100644
--- a/chalk-engine/Cargo.toml
+++ b/chalk-engine/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "chalk-engine"
-version = "0.65.0"
+version = "0.66.0-dev.0"
 description = "Core trait engine from Chalk project"
 license = "Apache-2.0/MIT"
 authors = ["Rust Compiler Team", "Chalk developers"]
@@ -16,9 +16,9 @@ default = []
 rustc-hash = { version = "1.1.0" }
 tracing = "0.1"
 
-chalk-derive = { version = "=0.65.0", path = "../chalk-derive" }
-chalk-ir = { version = "=0.65.0", path = "../chalk-ir" }
-chalk-solve = { version = "=0.65.0", path = "../chalk-solve" }
+chalk-derive = { version = "0.66.0-dev.0", path = "../chalk-derive" }
+chalk-ir = { version = "0.66.0-dev.0", path = "../chalk-ir" }
+chalk-solve = { version = "0.66.0-dev.0", path = "../chalk-solve" }
 
 [dev-dependencies]
 chalk-integration = { path = "../chalk-integration" }
diff --git a/chalk-integration/Cargo.toml b/chalk-integration/Cargo.toml
index 707a0af33b0..03c77d84915 100644
--- a/chalk-integration/Cargo.toml
+++ b/chalk-integration/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "chalk-integration"
-version = "0.65.0"
+version = "0.66.0-dev.0"
 license = "Apache-2.0/MIT"
 description = "Sample solver setup for Chalk"
 authors = ["Rust Compiler Team", "Chalk developers"]
@@ -14,9 +14,9 @@ string_cache = "0.8.0"
 salsa = "0.16.0"
 tracing = "0.1"
 
-chalk-derive = { version = "=0.65.0", path = "../chalk-derive" }
-chalk-ir = { version = "=0.65.0", path = "../chalk-ir" }
-chalk-solve = { version = "=0.65.0", path = "../chalk-solve" }
-chalk-recursive = { version = "=0.65.0", path = "../chalk-recursive" }
-chalk-engine = { version = "=0.65.0", path = "../chalk-engine" }
-chalk-parse = { version = "=0.65.0", path = "../chalk-parse" }
+chalk-derive = { version = "0.66.0-dev.0", path = "../chalk-derive" }
+chalk-ir = { version = "0.66.0-dev.0", path = "../chalk-ir" }
+chalk-solve = { version = "0.66.0-dev.0", path = "../chalk-solve" }
+chalk-recursive = { version = "0.66.0-dev.0", path = "../chalk-recursive" }
+chalk-engine = { version = "0.66.0-dev.0", path = "../chalk-engine" }
+chalk-parse = { version = "0.66.0-dev.0", path = "../chalk-parse" }
diff --git a/chalk-ir/Cargo.toml b/chalk-ir/Cargo.toml
index 45e39e2870f..b40d1f44b2d 100644
--- a/chalk-ir/Cargo.toml
+++ b/chalk-ir/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "chalk-ir"
-version = "0.65.0"
+version = "0.66.0-dev.0"
 description = "Chalk's internal representation of types, goals, and clauses"
 license = "Apache-2.0/MIT"
 authors = ["Rust Compiler Team", "Chalk developers"]
@@ -12,4 +12,4 @@ edition = "2018"
 [dependencies]
 lazy_static = "1.4.0"
 bitflags = "1.2.1"
-chalk-derive = { version = "=0.65.0", path = "../chalk-derive" }
+chalk-derive = { version = "0.66.0-dev.0", path = "../chalk-derive" }
diff --git a/chalk-parse/Cargo.toml b/chalk-parse/Cargo.toml
index 8196131fc1f..aa898b707ae 100644
--- a/chalk-parse/Cargo.toml
+++ b/chalk-parse/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "chalk-parse"
-version = "0.65.0"
+version = "0.66.0-dev.0"
 description = "Parser for the Chalk project"
 license = "Apache-2.0/MIT"
 authors = ["Rust Compiler Team", "Chalk developers"]
diff --git a/chalk-recursive/Cargo.toml b/chalk-recursive/Cargo.toml
index 2d120f2f88e..f211e5d1659 100644
--- a/chalk-recursive/Cargo.toml
+++ b/chalk-recursive/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "chalk-recursive"
-version = "0.65.0"
+version = "0.66.0-dev.0"
 description = "Recursive solver for the Chalk project"
 license = "Apache-2.0/MIT"
 authors = ["Rust Compiler Team", "Chalk developers"]
@@ -13,9 +13,9 @@ edition = "2018"
 rustc-hash = { version = "1.1.0" }
 tracing = "0.1"
 
-chalk-derive = { version = "=0.65.0", path = "../chalk-derive" }
-chalk-ir = { version = "=0.65.0", path = "../chalk-ir" }
-chalk-solve = { version = "=0.65.0", path = "../chalk-solve" }
+chalk-derive = { version = "0.66.0-dev.0", path = "../chalk-derive" }
+chalk-ir = { version = "0.66.0-dev.0", path = "../chalk-ir" }
+chalk-solve = { version = "0.66.0-dev.0", path = "../chalk-solve" }
 
 [dev-dependencies]
 chalk-integration = { path = "../chalk-integration" }
diff --git a/chalk-solve/Cargo.toml b/chalk-solve/Cargo.toml
index 9b7f0757672..7ba3104682e 100644
--- a/chalk-solve/Cargo.toml
+++ b/chalk-solve/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "chalk-solve"
-version = "0.65.0"
+version = "0.66.0-dev.0"
 description = "Combines the chalk-engine with chalk-ir"
 license = "Apache-2.0/MIT"
 authors = ["Rust Compiler Team", "Chalk developers"]
@@ -18,8 +18,8 @@ tracing-subscriber = { version = "0.2", optional = true }
 tracing-tree = { version = "0.1.4", optional = true }
 rustc-hash = { version = "1.1.0" }
 
-chalk-derive = { version = "=0.65.0", path = "../chalk-derive" }
-chalk-ir = { version = "=0.65.0", path = "../chalk-ir" }
+chalk-derive = { version = "0.66.0-dev.0", path = "../chalk-derive" }
+chalk-ir = { version = "0.66.0-dev.0", path = "../chalk-ir" }
 
 [dev-dependencies]
 chalk-integration = { path = "../chalk-integration" }