diff --git a/gnu/packages/crates-io.scm b/gnu/packages/crates-io.scm
index 9c60087430..02f1ea25dd 100644
--- a/gnu/packages/crates-io.scm
+++ b/gnu/packages/crates-io.scm
@@ -9433,7 +9433,7 @@ IEEE 754-2008 binary16 type.")
         (("rust-hashbrown" ,rust-hashbrown-0.5)
          ("rust-log" ,rust-log-0.4)
          ("rust-pest" ,rust-pest-2.1)
-         ("rust-pest-derive" ,rust-pest-derive-2.1)
+         ("rust-pest-derive" ,rust-pest-derive-2)
          ("rust-quick-error" ,rust-quick-error-1.2)
          ("rust-serde" ,rust-serde-1)
          ("rust-serde-json" ,rust-serde-json-1)
@@ -10446,7 +10446,7 @@ in Rust.")
         ("rust-failure" ,rust-failure-0.1)
         ("rust-lazy-static" ,rust-lazy-static-1)
         ("rust-pest" ,rust-pest-2.1)
-        ("rust-pest-derive" ,rust-pest-derive-2.1)
+        ("rust-pest-derive" ,rust-pest-derive-2)
         ("rust-ron" ,rust-ron-0.4)
         ("rust-serde" ,rust-serde-1)
         ("rust-serde-json" ,rust-serde-json-1)
@@ -13396,7 +13396,7 @@ a default trait implementation you've defined.")
         ("rust-num-rational" ,rust-num-rational-0.2)
         ("rust-num-traits" ,rust-num-traits-0.2)
         ("rust-pest" ,rust-pest-2.1)
-        ("rust-pest-derive" ,rust-pest-derive-2.1)
+        ("rust-pest-derive" ,rust-pest-derive-2)
         ("rust-quickcheck" ,rust-quickcheck-0.9)
         ("rust-rand" ,rust-rand-0.7)
         ("rust-rand-distr" ,rust-rand-distr-0.2)
@@ -13441,7 +13441,7 @@ statically-sized or dynamically-sized matrices.")
         ("rust-num-rational" ,rust-num-rational-0.2)
         ("rust-num-traits" ,rust-num-traits-0.2)
         ("rust-pest" ,rust-pest-2.1)
-        ("rust-pest-derive" ,rust-pest-derive-2.1)
+        ("rust-pest-derive" ,rust-pest-derive-2)
         ("rust-quickcheck" ,rust-quickcheck-0.9)
         ("rust-rand" ,rust-rand-0.7)
         ("rust-rand-distr" ,rust-rand-distr-0.2)
@@ -13478,7 +13478,7 @@ statically-sized or dynamically-sized matrices.")
         ("rust-num-rational" ,rust-num-rational-0.2)
         ("rust-num-traits" ,rust-num-traits-0.2)
         ("rust-pest" ,rust-pest-2.1)
-        ("rust-pest-derive" ,rust-pest-derive-2.1)
+        ("rust-pest-derive" ,rust-pest-derive-2)
         ("rust-quickcheck" ,rust-quickcheck-0.8)
         ("rust-rand" ,rust-rand-0.6)
         ("rust-serde" ,rust-serde-1)
@@ -16130,7 +16130,7 @@ algorithm.")
     (description "The Elegant Parser.")
     (license (list license:asl2.0 license:expat))))
 
-(define-public rust-pest-derive-2.1
+(define-public rust-pest-derive-2
   (package
     (name "rust-pest-derive")
     (version "2.1.0")